Tianjin University Beiyang Power Team participated in the Formula Car Competition for Chinese College Students. Photo courtesy of Tianjin University

　　If you ask a candidate who has just finished the college entrance examination, what is "machinery"? Perhaps the answers will be "gear", "lathe in the factory" and "robot", and at the same time, we should think of the impressions of "wide application" and "everywhere in production and life".

　　Before learning machinery, Zhuang Zheming’s concept of machinery came from the cartoon "Transformers" he saw when he was a child. He chose the major of mechanical design, manufacturing and automation in the School of Mechanical Engineering of Tianjin University with a vision for robots. He graduated this year and fulfilled his dream of "robot" with a graduation design work of "snake robot". This work also won him the first prize in the 13th Graduation Design Competition.

　　Let the students who have just entered the school gate and are still a little ignorant about the concept of mechanical discipline know more about the connotation of machinery when they leave the school gate, and plant a seed of "big machinery" that is "new and new" through "professional blending and advantage integration", and have the ability and experience of innovation and entrepreneurship, which is the concept and practice of "3 integration and 4 behavior" talent training exploration in the School of Mechanical Engineering of Tianjin University.

　　"Three-in-one and four-in-one" means to further emphasize and attach importance to the cultivation of compound and innovative talents on the basis of the traditional training objectives of knowledge, ability and quality, put forward the reform concept of integration, sharing and innovation, construct the "three-in-one" guarantee system of professional integration, resource integration and teacher integration, and explore the "four-in-one" training mode with team as the body, scientific research as the source, innovation as the foundation and entrepreneurship as the purpose.

　　The dilemma of "3A College"

　　In Tianjin University, as a discipline established at the beginning of the school in 1895, machinery is an "old discipline" of the same age as the school. In the view of Wang Tianyou, president of the School of Mechanical Engineering, the development history of mechanical discipline in modern China has always stood at the forefront of history, but compared with a hundred years ago, "machinery" has undergone earth-shaking changes from the outside to the inside.

　　The three first-level disciplines of the School of Mechanical Engineering of Tianjin University: mechanical engineering, mechanics and power engineering and engineering thermophysics, were all rated as "A" in the fourth round of national discipline evaluation, so the School of Mechanical Engineering is also called "3A College" of Tianjin University. The college has four undergraduate majors: mechanical design, manufacturing and automation, engineering mechanics, energy and power engineering and industrial design. Each major has a unique historical advantage and a strong disciplinary advantage. "Just like the four brothers in a big family, they are all wonderful and all ‘ Take care of each other ’ Live happily. Daily teaching and student defense, including teachers, are very independent. " Talking about the situation of three disciplines in the college more than ten years ago, Cao Shuqian, vice president of the college in charge of teaching, said that this has caused some problems in student training, the most obvious of which is that students’ knowledge and ability are single, and their ability to cross and cross borders is not strong; The superior teaching resources are scattered, and the students’ innovation platform is poorly shared. However, due to the prevailing atmosphere of emphasizing scientific research over teaching in domestic universities at that time, teachers’ investment in teaching was relatively insufficient and they lacked initiative in teaching reform.

　　At that time, the speed of knowledge updating and interdisciplinary research in the international scope was accelerating, the coverage of major in mechanical engineering was getting wider and wider, and the development of new economy and new industry was changing with each passing day. There was an urgent need for compound and innovative engineering talents with cross-border and innovative ability. Obviously, the compartmentalized education and teaching organization model can’t meet the requirements of talent training.

　　Tear off the "label"

　　On the one hand, under the baton of scores, students’ enthusiasm for participating in innovative and entrepreneurial projects is not fully encouraged; On the other hand, the habitual identity consciousness of "you are mechanical", "I am dynamic" and "he is mechanical" has become an invisible "label" attached to teachers’ hearts, and teachers’ motivation for interdisciplinary teaching to cultivate talents is not recognized.

　　In order for teachers to devote more energy to undergraduate teaching and students to devote more energy to innovation, it is necessary to change the meaning of grades and tear off the inherent identity "label" in teachers’ hearts.

　　"The first thing to change is the meaning of the score." Cao Shuqian said that when there were only 2 credits in innovative courses at that time, the college increased the weight of scientific and technological innovation in students’ total scores, so that students’ scores were not only the exam results of the courses, whether in the evaluation of Excellence or in the insurance research. For example, the College issued the Implementation Measures of School of Mechanical Engineering of Tianjin University to Encourage Students to Participate in Extracurricular Science and Technology Competition (Trial), which clearly stipulates that undergraduates who won the top three awards in Class A projects during their studies (the weighted scores in the first three years were in the top 60% of their majors), undergraduates who won the top two awards in Class B projects and special group projects in Class C will be given extra points on the basis of the average weighting of students when they are exempted from graduate students. Award-winning for different projects can be accumulated separately. At the same time, the determination of the workload of competition instructors and the recognition and reward of competition award-winning instructors (coaching staff) have also been clearly defined.

　　"All courses are open and teachers are open. Which course do you want to talk about, after passing a series of processes such as training, assessment, class assistance, collective lesson preparation and trial class, you can join the teaching team of the course and walk onto the podium. " Cao Shuqian said, teachers of public courses in disciplines get through, teachers of cross-disciplines in colleges get through, and the professional/disciplinary boundaries are broken … … At the beginning of the reform, the college has set up 17 teaching teams, 35 responsible posts and backbone posts, and teaching posts in several disciplines. Teachers’ performance and promotion are directly linked to teaching. This kind of teacher team integration and curriculum integration, on the one hand, has realized the adjustment and optimization of teaching teachers according to students’ needs, on the other hand, has promoted teachers’ investment in teaching, guaranteed the construction of important teaching projects, and improved the teaching effect as a whole.

　　Blend and create new things.

　　The team of teachers in the college has been opened, and the problem of sharing teaching resources and innovation platforms has been solved. The scattered 19 teaching laboratories were integrated into 4 experimental teaching centers, of which 3 were approved as national experimental teaching demonstration centers; Establish two national engineering education practice centers; Six national excellent courses and resource sharing courses have been built, and a group of innovation and entrepreneurship platforms has been built. The integration of platform and resources provides students with a broader platform for innovation and entrepreneurship, and also allows students to feel the struggle of youth in the initial experience of innovation and entrepreneurship and find the future direction.

　　Liu Songtao, the founder of Chenxing (Tianjin) Automation Equipment Co., Ltd., founded Astro Boy, a high-end parallel robot brand, after studying in the School of Mechanical Engineering of Tianjin University for 7 years, and won the gold medal in the final of the 4th China "internet plus" University Student Innovation and Entrepreneurship Competition. Looking back on his own road of innovation and entrepreneurship, Liu Songtao believes that the experience of participating in the "Beiyang Power" team as an undergraduate made him experience the process of "entrepreneurship" for the first time. When he entered the laboratory in his junior year, he cooperated with his classmates to complete the research and development of a prototype of a new four-degree-of-freedom parallel robot product and won the first prize in the graduation design competition, which encouraged him to embark on the road of innovation and entrepreneurship.

　　Compared with the seniors, Zhuang Zheming, who won the first prize in the graduation design competition this year, has the same rich experience in innovation and entrepreneurship: IEEE China Robot Design Competition, National Mobile Internet Innovation Competition (University Group), First Prize of National Renewable Energy Science and Technology Competition for College Students and National Youth Environmental Protection Competition & HELIP; … For Zhuang Zheming, the process of participating in the innovation and entrepreneurship competition is a process of teamwork, continuous learning and self-enrichment.

　　"4 for" promising

　　"Students’ bi-design comes from scientific research, innovation (college students’ innovation and entrepreneurship training program) comes from scientific research, competition comes from scientific research, students’ cross-disciplinary team cooperation and teachers’ cross-disciplinary guidance run through the whole process of students’ innovative training, and students’ innovative thinking and ability as well as their ability to solve complex engineering problems are fully exercised." In Wang Tianyou’s view, the "four-for-one" training mode with team as the body, scientific research as the source, innovation as the foundation and entrepreneurship as the purpose provides an effective path for the training of compound and innovative talents of traditional engineering majors.

　　Today, as the first mechanical undergraduate graduation design competition in China, it has been held for 13 consecutive sessions, expanding from the original college to 14 universities in Beijing, Tianjin and Hebei and Central and East China. The entries involved more than 10 major mechanical engineering majors, including mechanical design and manufacturing and automation, industrial design, energy and power engineering, engineering mechanics, process equipment and control engineering, and thousands of students participated.

　　All students realize the cultivation of basic innovation by participating in teachers’ scientific research projects and carrying out graduation projects; Teachers extract innovation projects and discipline competitions from scientific research projects, and more than half of the students realize the promotion and innovation training by participating in innovation and competition projects; Some students extract entrepreneurial projects from big innovation and competition projects to create technology companies. Student innovation projects have increased from 37 in 2012 to more than 100 projects every year; Students independently set up scientific and technological entrepreneurial teams from scratch, and now there are 14 and 12 registered scientific and technological companies.

　　In the eyes of teachers and students, the training mode of "three in one and four in one" promotes the ability and level, and it is also the enthusiasm and passion for continuous innovation and entrepreneurship, which is the fashion password of century-old machinery. (Correspondent Liu Xiaoyan)

　　　　　　 CCTV News:"The U.S. military regards quantum computing as a key weapon in the space war", which is the title of a report of the U.S. Space Network on July 15th. A few weeks ago, senior Pentagon officials began to discuss with scientists the future of quantum computing in the US military. What is quantum computing? Why is the United States waiting for it?

　　　　　　 On June 27th, 2018, the Committee on Science, Space and Technology of the U.S. House of Representatives passed the National quantum scheme Act, announcing that it will invest 1.3 billion U.S. dollars in 2019 -2023 to conduct state-level quantum technology research.

source map

　　　　　　 On November 10th, 2017, IMB announced that it had successfully developed a quantum computer with 20 qubits. In addition, IBM has successfully developed the world’s first 50-bit qubit prototype.

　　　　　　 If the superpowers mastered nuclear technology in the 20th century, they would gain global hegemony. Then in the 21st century, a big country that has mastered quantum technology is called "quantum hegemony" by Preskill, a theoretical physicist at California Institute of Technology.

　　　　　　 In 1936, alan turing, the "father of computer science", submitted a paper entitled "On the Application of Digital Computing in Solving Difficult Problems" to the authoritative mathematical magazine in London. In the paper, an idealized computing model which can assist mathematical research was proposed, and it was later called Turing Machine. By using the permutation and combination of pure digital symbols 0 and 1, the connection with the physical world was established, and later this concept was applied to computers and became the core of modern computers.

turing

　　　　　　 Over the past 80 years, although computers have become smaller and faster, and the memory has become larger and larger, the basic core has remained unchanged. Until 2010, D-Wave, a company located in Vancouver, Canada, launched the world’s first commercial quantum computer, D-Wave One, which won the title of "revolution".

　　　　　　 Traditional computers use the smallest unit "bit" of binary data to process information. Each bit represents a binary digit, which can represent 0 or 1. These 0′ s and 1′ s, like switches, finally constitute calculation data for a simple operation. For example, to solve a maze, the traditional computer will try every possible route one at a time and finally find the right one. The method of quantum computing is completely different. Quantum computers use quantum bits and make use of the two principles of quantum superposition and quantum entanglement in quantum physics. Compared with electronic bits, quantum bits are fuzzy. That is, a thought experiment "Schrodinger’s cat" often mentioned in physics.

　　　　　　 To better understand how quantum computers work, let’s give an example from life. Imagine a library. We choose a book in the library, put a cross on one page of the book, and then close the book. Then we asked the traditional computer to find this fork in the book. Traditional computers will look at page by page, and they will soon find the page with the cross. But if the computer doesn’t know which book the fork is in, it must look at every page of every book, which will take a long time. If it is to find the fork on that page in all the millions of books in the world, it will take centuries for traditional computers and it is almost impossible to achieve it. But if there is a quantum computer, it is completely different. Because it can search all pages in all books at the same time, it can find this fork in a few seconds.

　　　　　　 The running technology on the traditional computer can skillfully find the rules buried in the massive information, but the quantum computer can give the answer when there is not enough information or too many solutions to find the rules.

　　　　　　 The huge difference between quantum computer and traditional computer in operation enables it to perform operations that traditional computers can’t do, and it can even solve some complex problems that the most advanced supercomputers can’t solve.

　　　　　　 Andrew Foresman and Langdon Downs founded the 1Qbit startup company six years ago, and convened the global "super brain" to build quantum software. This idea is being realized step by step. Foresman said that quantum computers may simulate the human world in the future.

　　　　　　 In the American sci-fi drama westworld, by copying and simulating people’s thinking, bionic people are created to continue their lives. More subtly, this kind of simulation and replication is not fixed, but slight defects may occur randomly. The origin and evolution of species are also due to unpredictable "defects" in the genetic process. This is also the key difference between machines and humans.

　　　　　　 With quantum technology, everything is possible.

　　　　　　 However, the conditions of quantum effect are very strict, and it is necessary to cool the quantum chip to near absolute zero with liquid helium, which is about equal to MINUS 273.15 degrees Celsius to run stably.

　　　　　　 In the future, the convenience brought by quantum computing technology will not only be reflected in life, but also contribute to the military.

　　　　　　 Canada’s Super Invisible Biotechnology Company claims to have developed a "quantum invisibility cloak", just like the invisibility cloak worn by Harry Potter, which can make the wearer "disappear" in people’s sight instantly. This kind of camouflage materials can bend the light, which can not only "cheat" the naked eye, but also be invisible under the detection of military night vision goggles, infrared rays and thermal imaging technology. Camouflage materials, a Canadian super stealth biotechnology company, was quickly recognized by the US military and gave the company a lot of financial support for subsequent research and development.

　　　　　　 At present, many countries have begun to study quantum computing technology.

　　　　　　 On August 16th, 2016, China successfully launched the "Mozi" quantum science experimental satellite. The US Space Network reported that the satellite adopted quantum secure communication technology and became an "invulnerable" satellite.

　　　　　　 Britain is planning a $400 million sensing and timing project based on quantum technology; A similar project in the EU is expected to invest $1 billion in 10 years; Canada, Australia and Israel also have considerable plans.

　　　　　　 In the early 1990s, Elizabeth Berman, a physics professor at Wichita State University, began to study the combination of quantum physics and artificial intelligence. But at that time, most people questioned this. Nowadays, artificial neural network and machine learning have become the most subversive technologies. They not only appear in tasks that humans are not good at, such as data mining, but also begin to appear in tasks that humans are good at, such as facial recognition. This means the personification of artificial intelligence. If quantum computing is used, it will completely solve all kinds of problems faced by artificial intelligence, and the future quantum war will really challenge the human brain.

Yam Tat-wah; Simon Yam

　　In the face of a "gangster" who has acted in more than 160 movies and more than 2,000 TV series, and can still eat with charm and eyes at the age of 52, you can’t help but feel awe. In the early morning of the 6th, Yam Tat-wah, who just got off the plane, accepted an exclusive interview with this newspaper in a suite of 8,000 yuan a night. During the nearly two-hour chat, except for a "violent" lock breaking incident because she forgot the suitcase password, Yam Tat-wah was so gentle. Just like when he spoke for Zhonglong International Royal Seal Real Estate at the press conference the next day, the host mistook him for Andy Lau (listening to music), and he didn’t take out a gun from the inside pocket of his suit. And when you see him take out a schedule filled out by himself, accurate to the hour, you may even think that he is so old-fashioned in life, but this is Yam Tat-wah’s real off-stage life.

　　Become famous and never forget your roots. Never eat abalone or bird’s nest.

　　Yam Tat-wah told reporters openly that his family was poor in childhood and adolescence. He lost his father when he was 11 years old. His mother took three children to live in a crowded corridor, and 30 families shared five bathrooms. In addition to studying, Yam Tat-wah also helps her mother string beads and make plastic flowers to subsidize her family. "The only entertainment is to watch a black-and-white TV at home. At that time, I really want to become a TV person." But the opportunity came at once. In the first year of middle school, Yam Tat-wah saw an advertisement for a model in the newspaper. He usually loves sports and has a strong figure. He signed up and was lucky to be selected. "I remember it was an advertisement for soda. I drank three bottles and passed, and the reward was only 200 yuan. Although it is a supporting role, so many models are popular with me, so happy. " Since then, more and more businesses have started to find Yam Tat-wah, and he can afford his own tuition. Yam Tat-wah’s life today has always been influenced by his childhood. For example, he never eats abalone and bird’s nest. "I tell people around me that it’s useless to eat those every day. I am a person with rice feelings. I must eat a dish every day-tofu, which is nutritious and cheap. I like vegetables and eggs, which is cheap and beautiful." The "boss" who is very affectionate has not been alienated from the friends who lived in the corridor in the past. "We have to get together several times a year."

　　When you are popular, you still insist on sacrificing yourself to achieve various roles.

　　Yam Tat-wah said several times in the interview that he was very lucky. In 1979, he got a leading role to play the police. "I have always respected the police in my life, and as long as I put on my uniform, the feeling of the police will come out, and I don’t have to play. You can never play like Stephen Chow, even if you play a funny policeman. " Asked repeatedly why there was such a strong police complex, Yam Tat-wah revealed that his father and brother were both policemen, and that "the death of my father was also an accident on business". And his brother Ren Darong is now a senior official of the Hong Kong Police Force. However, Yam Tat-wah said that his brother never commented on his gangster films. Yam Tat-wah also said that in fact, he is more looking forward to playing the police than the murderous gangster boss. "There is no way, I am like a fruit in a fruit bowl, and I will sacrifice myself to achieve various roles." Some people say that Hong Kong’s entertainment industry is now in an era of neglect, and the new generation of Nicholas Tse (listening to music) and Daniel Wu always give people the feeling that they can’t take over. Yam Tat-wah said that this will happen everywhere. "It’s not that they are not good, but that they don’t stick to it well. For example, some of my friends who were very popular more than 20 years ago don’t know where they are now, but look, Du Qifeng and Chow Yun Fat (listening to music) are all insisting, and there are young actors who want to make good movies, so don’t overdo it. Some things come too fast, so we should know how to cherish and enjoy them. "

　　Happy family will send her daughter to Beijing to study in the future.

　　Yam Tat-wah and his wife, Sophia Kao, one is an actor and the other is a supermodel, who are playing the romantic myth like a fairy couple in the entertainment circle. Yam Tat-wah said with a smile that he had been unrequited for two years before pursuing Sophia Kao. "Love at first sight, hard to chase. I saw Sophia Kao’s photo in a magazine, and I had the idea of making her my wife. But asking questions, no one knows where she is. I looked at the photos for two years, but I finally met her in an Austrian hotel. At that time, I invited her to have dinner with her parents. How do you make it clear about fate? " Now they have a lovely three-year-old daughter, Ren Qingjia. "Being a father is different. I am tired every day, and I smile at my daughter when I get home." He likes buying houses all over the country, and even bought a suite in her name when her daughter was one year old, and planned to use it as her residence when she was studying in Beijing in the future. Yam Tat-wah said that he would never send his daughter abroad to study: "The capital has a cultural atmosphere and historical sites, so why should it be sent out? My Mandarin is still not standard, please ask the teacher to teach, but my daughter’s first language is Mandarin and she speaks Mandarin. " Yam Tat-wah, who is eager to love her daughter, also said that children should not go their own way. "It is too hard to be an actor, and the EQ is very high to perform the trick well. Of course, if she likes it when she grows up, there is no way. I can only teach it by myself."

　　Link will personally decorate his home in Changsha.

　　This time, Yam Tat-wah made a special trip to Changsha, mainly to speak for Zhonglong International Royal Seal in the real estate project. Yam Tat-wah said that he has invested in properties all over the world, such as Manhattan 58th Street in new york, the second district in Paris, Central in Hong Kong and New World Business District in Beijing, totaling more than 20 places. Yam Tat-wah, who has become a real estate expert, said that he pays great attention to the grade and taste of real estate, and will never speak casually. "This endorsement of Zhonglong International Royal Seal, in addition to my satisfaction with the remuneration, I also bought a house myself. I have learned in detail that the central lake is 6000 square meters, and specially designed elevator buttons, smart cards for the elderly and children, spacious apartment space of 180 square meters to more than 500 square meters and perfect educational configuration. No matter the structure, texture, taste or humanistic environment of the house, it is very humanized. To be honest, this kind of property may not be possible even in Hong Kong. " Yam Tat-wah also said that this is also his first house in Changsha, and he likes to design and decorate his own mansion himself. In addition, Yam Tat-wah, who has been fascinated by photography for many years, said that he will come to Changsha again in a few months, and hold an exhibition of his own photography works in the newly-built clubhouse of Zhonglong International Royal Seal to communicate with fans in Changsha.

Our reporter Wang Lu Changsha reports.

　

Editor: Liu Liyan

　　On March 13, the three major stock indexes of A shares closed down, closing at a daily limit of 62 shares (including 5)）； 30 strands failed to seal the board, and the overall sealing rate was 67%.

Battlefield of daily limit: over 700,000 hands pay the bill to raise money.

　　According to the statistics of Times and DataBao, from the closing daily limit, the number of closed orders was the highest, with 717,200 lots; Followed by、The daily limit orders were 568,800 lots and 311,000 lots respectively.

　　Calculated by the amount of the seal,The amount of 5-share seal exceeds 100 million yuan,The amount of sealing orders was the highest, with 362 million yuan, 293 million yuan and 199 million yuan respectively.

　　Judging from the number of consecutive daily limit days,、7 boards,, 4 connecting plates,,、、3 even the board,,、、Equal to 9 strands and 2 boards.

　　Besides,6 th, 4 boards,5 th, 3 boards,2 boards on the 4th,、、3 rd, 2 boards.

Leading the finishing touch:Multi-share daily limit of automobile industry chain

　　1. Automobile industry chain

　　Daily limit stocks:,、、、、、

　　March 12 th news,It is officially announced that Xiaomi SU7 will be officially listed on March 28th, 2024. On March 11th, the director of the State Financial Supervision and Administration said that he was studying to reduce the down payment ratio of passenger car loans and further optimize the pricing mechanism of auto insurance.

　　: On March 13th, the Ministry of Industry and Information Technology released the 381st batch of "Announcement of Road Motor Vehicle Manufacturers and Products", which included the brand-new smart choice vehicle Enjoying S9 jointly built by Huawei and Beiqi Blue Valley, and the production place was Beiqi Factory in Caiyu Town, Daxing, Beijing.

　　: wholly-owned subsidiaries Wuxi, Xu Xuehai and Xinneng.The establishment of Wuxi Huateng Xinneng will focus on the early stage of Huateng Xinneng.Technical reserve and research and development of automobile drive system, plug-in hybrid electric vehicle drive system (including extended range) and new energy marine drive system.

　　: The company has obtainedThe passenger car thermal management project cooperated with Huawei is still in the development stage, and the production has not been actually scheduled, which will generate sales revenue after mass production.

　　2、and

　　Daily limit stocks:、、、、、

　　In the news, the Global Developers Conference will be held in San Francisco from March 18th to March 22nd, Beijing time.

　　: Two companies under the company belong to game developers, and independently research and develop well-known IP such as "Chivalrous Road".The product line covers mobile games, page games and end games.

　　: AI Xinghe is a project that the company explores the field of "game+medical care" by combining AI and VR technologies.

　　3、

　　Daily limit stocks:, Rongji software,、

　　In the news, Huawei ShengsiThe framework summit will be held on March 22, 2024.

　　: The company’s position in the operating system industry of Galaxy Kirin continued to consolidate, and its market position remained ahead.

　　Rongji software: the company undertakes government affairs.Platform, engineering, information security and other major national information projects, as well as core business support systems and key common technology platforms in many industries.

　　The company is mainly engaged in the research and development of report management software, e-government software, ERP software and business intelligence software, and its product line mainly covers government reports and statistics. existThe application field introduces industry solutions focusing on finance and taxation.

Dragon and Tiger Stand: Net Buy of Dragon and Tiger ListOver 80 million yuan

　　In today’s dragon and tiger list,、、、, American new technology,、,, Lanhai Huateng and others are on the list.

　　Among them,,, were the top three net purchases in the Dragon and Tiger List that day, with 82.7471 million yuan, 69.0448 million yuan and 41.9992 million yuan respectively.

　　Among the stocks on the list of institutional seats, the top three net purchases are、, 4.0402 million yuan, 1.3746 million yuan and 166,000 yuan respectively.

　　Net selling of dedicated seats56.8152 million yuan, 55.1538 million yuan.Net purchase of dedicated seats23.7335 million yuan,20.2571 million yuan.

　　In terms of hot money, Huaxin Xi ‘an Branch bought a net amount of 73.0073 million yuan from CITIC Haizhi;The sales department of Qinghe East Road in Guangzhou sold century huatong 71,291,700 yuan.

　　Disclaimer: All information in DataBao does not constitute investment advice, and the stock market is risky, so investment should be cautious.

　　On February 27th, 2023, the Central Committee of the Communist Party of China and the State Council issued the Overall Layout Plan of Digital China Construction (hereinafter referred to as "the Plan"). The Plan points out that speeding up the construction of digital China is of great significance and far-reaching influence on building a socialist modern country and promoting the great rejuvenation of the Chinese nation in an all-round way. The Plan also points out that it is necessary to strengthen the supply of high-quality online cultural products, guide various platforms and netizens to create and produce positive, healthy and upward-oriented online cultural products, and further promote the digital development of culture and implement the national cultural digital strategy. Teenagers are the vanguard force to realize the great rejuvenation of the Chinese nation, the new force to achieve the goal of the second century and build a socialist modern power, and they can’t be absent from the overall layout of the construction of digital China. It is one of the core essentials of the construction of digital China to let minors enjoy the universal and convenient digital culture and get high-quality development in the digital society.

　　According to the "Research Report on Internet Use of Minors in China in 2021" (hereinafter referred to as "Report") issued by the Central Rights and Interests Department of the Communist Youth League and China Internet Information Center, the top five online use behaviors of minors are online learning (88.9%), listening to music (63.0%), playing games (62.3%) and chatting (53.4%). It can be seen that minors mainly use the Internet for learning and entertainment, especially through the Internet. According to the report, nearly 40% of minors learn extracurricular knowledge through the internet, and more than 70% think that the internet is helpful for learning. This shows that the internet use of minors is gradually changing from "toys" to "tools" and from entertainment to knowledge.

　　Karl Mannheim, a German sociologist, believes that knowledge is characterized by openness and mobility in the process of modern society. The knowledge of short video platform broke the knowledge barrier, changed the linear and self-contained characteristics in the past, and showed the characteristics of networking and knowledge sharing. Through the reorganization and transformation of knowledge, it creates a learning space and platform with diverse contents and rich forms for people, which makes the boundary of knowledge learning in the digital age more extended and integrated, and serves the minors and provides them with an important channel to broaden their horizons and increase their knowledge. The short video is visual, scene-oriented and practical, which is more in line with the cognitive law of minors. Therefore, the Report also shows that nearly half of minors study through short video platforms. Among them, 34.0% are primary school students, 61.8% are junior high school students, 65.1% are senior high school students and 64.7% are secondary vocational school students. It can be seen that the proportion of minors over 12 years old who are exposed to short videos is higher. Minors watch short videos of learning knowledge such as exam counseling and classroom knowledge, accounting for nearly 40%, and watch short videos of interest knowledge such as piano, chess, calligraphy and painting, historical geography, sports and dance, and watch short videos of leisure knowledge such as tourism and food, accounting for nearly half. Moreover, short video platforms such as Tik Tok have also become the main channels for minors to expand their cognition.

　　Facing the brand-new learning style of minors in the digital age, how to use short videos scientifically and reasonably has become a new topic for family rearing and school education in the digital age. Some parents worry that their children are addicted to short videos, but psychological research believes that addictive behavior needs six elements: goal, feedback, progress, challenge, suspense and socialization. That is to say, users are more likely to be addicted if there are six elements in the process of using a product: having a goal, getting feedback in time, getting rewards frequently, constantly encountering new challenges, uncertain results and having social attributes. Moreover, whether it is addictive or not is closely related to the user’s living conditions, psychological conditions, interpersonal relationships and family upbringing. Although short videos have increased people’s sensory experience more comprehensively than words or pictures, they also have social and entertainment attributes, but they do not have these six elements at the same time. The shortcomings of the short video platform, which mainly transmits information, in constructing a new field of knowledge learning are mainly the homogenization of content and the diversification of value. Parents, teachers and other adults should help minors to make good use of the knowledge resources of short video platforms, so that children can enjoy high-quality digital culture through entertaining. Short video is rich in content, diverse in forms, strong in story, short and pithy, and it is more convenient to "brush the screen" in free leisure time, so it has also become people’s leisure products. In order to better transform its entertainment into education and fully integrate entertainment and education, adults need to have high digital literacy.Give more practical help and guidance to minors.

　　Parents and teachers should empower minors and create a digital environment suitable for their development. At the World Digital Education Conference held in February 2023, the Ministry of Education issued "Teachers’ Digital Literacy", requiring teachers to make good use of digital education resources to guide students’ learning. Similarly, parents also urgently need to improve their digital literacy, enhance their digital thinking, digital cognition and digital skills, and make good use of the digital cultural resources of the Internet platform with their children to develop a green and intelligent lifestyle. Parents and teachers should pay special attention to the following relationships in order to make children benefit from opening books to opening screens, and from simple entertainment to entertaining:

　　Balance online life and offline life. The development of the Internet has increased the inclusiveness of knowledge and brought new learning experiences and knowledge acquisition channels to children. Parents and teachers should pay special attention to guiding children to balance online life and offline life. We should not only pay attention to enriching children’s online life, so that children can live a quality digital life, but also pay attention to children’s offline leisure, social, family life and campus life, so that children can have a healthy and positive offline life, which is more conducive to children’s online life and offline practice.

　　Balance entertainment and education. Knowledge in the visual and interesting packaging of short videos makes children feel more interesting and easier to learn. However, in the eyes of many parents and teachers, they always feel "unlike" learning, because in the eyes of adults, they should "learn from the sea and work hard." As the children of the Internet aborigines, it seems that fun is the last word. Parents and teachers should pay attention to balance the relationship between the two, not only to meet the needs of the network generation for learning change, so that children can gain a sense of participation and belonging in their studies, but also to increase education in entertainment, so that children will not get lost in the network in joy, thus dispelling the "heavy feeling" of learning.

　　Balance short and systematic. Shortness is both an advantage and a disadvantage of short video. Short knowledge is more convenient for students to watch and more suitable for children’s short attention time. However, learning knowledge also needs to be systematized, so as to avoid "the blind touch the elephant". Parents and teachers should make good use of their advantages, and at the same time, they should consciously guide their children to build the knowledge system they need, and conduct multi-dimensional and multi-level discussions around a certain topic and a certain kind of problems, so that children can overcome the problems brought by short video learning.

　　Balance child practice and child protection. The barrage, comments and live broadcast of short videos are more interactive, which is also a "double-edged sword". The advantage is that children have more opportunities to participate, think and interact when learning online, but the problem is that it may also bring risks to minors. Therefore, we should not only encourage minors to participate in more practice, but also do a good job in protecting the rights and interests of minors. In particular, parents and teachers need to enhance their awareness of child protection, improve their digital literacy and that of minors, so that every child can enjoy the fun of knowledge learning.

　　Text/Sun Hongyan

　　(Director, Institute of Children and Adolescents, China Youth Research Center)

After Brazil reached the World Cup quarter-finals, I believe all Brazilian fans around the world share my feelings: it’s been 20 years, and it’s finally dawn.

Don’t think that abusing South Korea is nothing. Now the South Korean team is no longer Amon. Looking at today’s football, no team except Brazil can win so brutally, thoroughly and heartily against South Korea. France can’t, England can’t, and Argentina can’t, but Brazil, which vowed to win for Pele, who is seriously ill, can.

Being a Brazilian fan is a very unique experience. On the one hand, it is very cool. Every World Cup is a favorite to win the championship, and there are warm expectations every four years. On the other hand, it’s very painful, because Brazil always fails if it doesn’t win the World Cup, but winning the World Cup requires not only strength, but also various coincidences, so more often, Brazilian fans will end their mental journey of the World Cup in disappointment.

Brazil has not won the championship for 20 years. What happened to the Brazilian team in these 20 years? Let me give you a brief stroke.

In 2006, Brazil claimed to be the strongest in nearly 40 years. However, arrogant soldiers are bound to lose. Please go back to the iron coach Pereira, who can’t relax put in order’s tactical discipline. When Henry beat Brazil, Carlos, the world’s number one left-back, was tying his shoelaces. Let us remember this little bald head that makes people love and hate.

In 2010, Brazil, with dim stars but strong integrity, was the only team that ever beat Spain in the Confederations Cup. In the knockout against the Netherlands, it not only took the lead, but also completely controlled the situation. However, a guy named Melo suddenly went crazy, making an own goal before a red card. Let’s remember the name Melo.

In the 14th and 18th World Cups, Brazil really can’t do it. Neymar is the only one who makes waves in the attack line. In 2014, Neymar and Tiago were absent, and in 2018, the two main full-backs were absent. However, these are not the main reasons for being eliminated, because from beginning to end, the Brazilian team did not show the dominance that the champions should have. The midfielder who wore the No.10 jersey in the 14th World Cup was Oscar, the one who later joined the Super League. He was a typical diligent organizer at Chelsea, diligent? What is the difference between this and swearing? Let’s remember the name Oscar, the worst midfield organizer in Brazilian history. The striker arrow of the 18th World Cup is Jesus, the one who just retired due to injury. His retirement is definitely good for Brazil. He may be an excellent striker in other teams, but he can only be regarded as a loser in Brazil. Let us remember the name Jesus, the worst striker arrow in Brazilian history.

Brazil’s group match was 2 wins and 1 loss, and it didn’t sweep all the way, but why is Brazil considered the biggest favourite to win the championship? Because Brazil only played Serbia in the first game and South Korea in the fourth game, not only the top star Neymar was absent due to injury, but even other players left half their strength.

Playing Serbia, Brazil showed the ability to control the field, basically did not let Serbia have any strength to fight back, and finally defeated this potential dark horse in many people’s hearts 3-0; Facing South Korea in the first match of the knockout, it is an all-round display of offensive firepower. I can say responsibly that this Brazilian team is stronger than the champion team led by 3R in 2002. Brazil beat China 4-0, but now this Brazilian team only needs half time to beat South Korea 4-0. If it doesn’t take the initiative to stop, a bloody case may happen at any time.

How strong is this Brazilian team? So strong that they don’t need full-back assists anymore. As we all know, the Brazilian team has never lacked epic full-backs. At present, the main full-backs in Brazil are Danilo and Sandro, which are not the top players in the world and far from the ability of Carlos and Cafu. The substitutes behind them are Alves, who spent nearly forty years brushing data with soy sauce, and Telles, who went home because of injury. In recent decades, looking around the world, we have almost never seen such a "greedy" full-back. When Brazil played offensive football, these two full-backs never forgot their responsibilities as defenders, and they managed the defense wholeheartedly. Wang Shenchao and Wang Gang of the national football team were more active in attacking than Brazil.

Why do Brazilian full-backs seldom take part in the attack? Because of three words: no need. There are as many as nine strikers in Brazil this time. Except for Jesus and Richarlyson, the other seven have winger attributes, and even Richarlyson made his debut as a winger. The winger is almost the answer to the version of football in this era. Brazil has so many wingers and all of them are excellent. The last guy is Anthony, and Manchester United spent 100 million yuan to buy him. You said, why do you need a full-back assist?

In fact, Brazil has not won the championship for 20 years, largely because Brazil has been short of excellent attackers since Ronaldinho retired. I don’t know when Brazil’s most sought-after players in Europe are divided into three categories, the first category is goalkeepers, the second category is central defenders, and the third category is engineers’ midfielders who do dirty work. The homogenization of Brazil’s talents is similar to that of Spain and Germany, which can’t find a center, so they have been tossing the ball around in the middle and back court.

This phenomenon has a lot to do with the tactical changes brought about by the last 24-year World Cup in Brazil. During those 24 years, Brazilian attack experts emerged one after another, attacking beautifully and defending bean curd dregs. After learning from a painful experience, Brazil began to focus on cultivating defensive engineers and redefining tactical discipline.

Brazil won the championship in 1994 and in 2002, which are essentially the same. The first time was a big shovel with romario and Bei Beituo in front and dirty work behind it, and the last time was a big shovel with 3R in front and dirty work behind it. The reason why this match can be established is that the big shovel for doing dirty work in Brazil is different from that in other countries. The big shovel in other countries is a pure engineer, and all Brazilian players have excellent ball-throwing ability, ball control ability and organization ability. Brazil’s big shovel, which won the championship twice, is more capable of threading the needle than English epic midfielder Steven Gerrard, such as gilberto silva.

However, no matter how offensive and defensive the back is, it is absolutely impossible without the arrow of the front line. In recent ten years, except for Neymar, other attackers in Brazil are really bad. Until this World Cup cycle, Brazil finally ushered in a blowout of attacking talents. Today, the reserve of Brazilian attackers is second only to the quintet of Ronaldinho, Kaka, Robinho and Adriano in 2006. However, that Brazilian team was eliminated by France long ago. When it beat Ghana 3-0 in the first round of the knockout round, there was no whole, and the tactical content was extremely poor. Now the overall cohesion of the Brazilian team is extremely tight.

Of course, Brazil also has rivals in winning the World Cup. The strongest opponent this year is still France, which not only plays well, but also is the natural enemy of Brazil.

Since the 1980s, Brazil has been defeated by France in the World Cup, and fell to France in 1986, 1998 and 2006. The French team has a solid footwork, tight defense in the center and backcourt, and at the same time, there is no shortage of skills and attack experts at the foot, which really beats Brazil in style. However, due to the absence of Kantor and Bogba, the French team changed its attack route. Although Mbappé was in a state of explosion and Gleizman became an excellent organizer, Brazil really didn’t like this type of France, and the two sides were still 60% sure of playing Brazil.

Thankfully, after a lapse of 20 years, the World Cup has returned to Asia. As the only "football kingdom" in the world, Brazil has also seen the possibility of returning to the top. By the way, do you remember those names just now? Melo, Oscar and Jesus, if you are not an Arsenal fan this season, you may have forgotten these names again, because although these players once represented Brazil in the World Cup, they never shocked people from their achievements to their playing methods. Even if they wore Brazil’s bright yellow shirts, they would not leave too many memories in the hearts of fans.

Football fans support a team and want nothing more than two things: excellent results and beautiful games, which are exactly what Brazil must have at the same time when it wins the World Cup.

That’s why we can remember the gorgeous representatives of Brazil: Ronaldo with a lucky head, Ronaldinho who cheated the English goalkeeper Seaman, Roberto Carlos whose thigh circumference is thicker than anyone else, and of course, Brazil’s eukaryotic Neymar now;

That’s why, I will also remember those tough backbones of Brazil: Taffarel, who is not well known, Dunga, who is not handsome, and thiago silva, who is now an old and strong captain.

There is only one Brazilian team in the world, but Brazil has more than one kind of football content. In 2022, Brazil in Qatar may not present the world wave that Ronaldinho did at the beginning, but they will always have a wonderful volley side hook like Richarlyson, and at the same time defend their own goal with tough defense and tough confrontation.

So 20 years later, when the World Cup returns to Asia, we seem to see the excellent hope that the World Cup will return to Brazil. Especially when they pull out the banner of "Fight for Bailey", so that more people are willing to stand behind them. There is already a king in heaven, so let another one stay with us for a while on earth.

The World Cup needs Brazilian football, and the world needs Brazilian football more.

Leicester city VS Leeds United

Leicester City defeated the Rangers away from home, and the league won 9 consecutive victories. The team’s recent performance is still hot, and it currently ranks first in the league with 39 points. Leicester city’s offensive end is active, and the stability of defense line is extremely strong. Leeds United beat Hadders at home in the last league. Although the team has experienced some ups and downs recently, it still wins more and loses less overall. At present, it ranks third in the league with 25 points. Leeds United’s offensive output is equally strong, but the defense strength is really insufficient in the near future.

Leicester city’s recent performance is still strong, and the team is currently at the top of the league. At the same time, the team’s home performance is also very strong. Leeds United is still winning more and losing less in the near future, but its overall stability is still insufficient compared with its opponents, especially the team’s recent defensive line is unstable. This time, leicester city is sitting at a strong home, and I believe there is still a chance to win the opponent’s winning streak.

Las palmas VS Atletico Madrid

Las palmas defeated Alme, the underdog in the last league, and the team has won many victories in the underdog recently. At present, it is chasing the 10th place in the league with 14 points. Las palmas’s offensive output has been strengthened, but the stability of the defense line is still insufficient. Atletico Madrid defeated Alaves at home in the last league, and the league won six consecutive victories. The overall state and stability continued to rise, and it is currently ranked third in the league with 25 points. Atletico Madrid’s offensive output has been continuously improved, and its defensive performance is acceptable, but the situation of zero sealing has been reduced.

Las palmas’s recent achievements have indeed warmed up, but the opponents are mostly weak teams in the league, and the gold content is really not high. The team’s performance at both ends of attack and defense is still obviously insufficient in the face of strong teams. Atletico Madrid’s recent performance is still strong, and the front line output is still very stable, but the defensive strength needs to be improved. This time, Atletico Madrid is a guest to challenge the opponent. I believe it is still a cinch to take away three points.

Paris saint-germain VS Montpellier

Paris Saint-Germain beat brest away from home in the last league, and the league won three consecutive victories and five unbeaten rounds. The team’s recent performance has been getting stronger and stronger, and the difference between the team and Nice at the top has narrowed to one point. The offensive output of Paris Saint-Germain has been strengthened again, but the defensive strength needs to be strengthened. Montpellier beat Toulouse at home in the last league. Although the team lost away from home before, its overall performance is still strong in the near future. At present, the team ranks sixth in the league with 15 points. Montpellier’s offensive output is still significantly strengthened, but the defensive end is also not stable enough.

The overall strength of Paris Saint-Germain is very secure, and the team’s recent achievements and performance are also worthy of recognition. In addition, the team has also found the home court advantage. The overall performance of Montpellier has also improved recently, winning several victories, but it is still difficult to compete with Paris in terms of strength. Montpellier’s visit to challenge Paris this time, I believe it is still a situation of losing less and winning.

Porto VS Lille, esto

Porto defeated Visala away from home in the last league, and won two consecutive victories in the league. Although the team suffered defeat in the face of traditional powerful teams, it still had no pressure in the face of other opponents. At present, the team ranks third in the league with 22 points. Porto’s offensive output is very secure, and the stability of the defense line has also improved. Lille, esto, lost to Polti in the last league, and the league suffered another three-game losing streak and seven rounds. At present, it only ranks at the bottom with four points. Esto Lille’s offensive performance is also relatively active, but the defense loopholes are also huge.

Porto’s overall strength is very secure, and the team is still able to face other opponents in the league, and the performance at home is also very safe. Rival esto Lille’s recent performance is still sluggish, although the offensive output is still guaranteed, but the defense loopholes are too large. This time, Porto sat at home to meet the challenge of the vice squad leader. I believe the team still has the ability to beat the opponent and win three points.

Bologna VS lazio

Bologna drew with Sassuolo in the last league. Although the team’s winning ability is not strong, it can still guarantee the unbeaten game in nine rounds, and the overall stability is acceptable. At present, the team ranks eighth in the league with 15 points. Bologna’s offensive output has strengthened, but the stability of the defense line has declined. Lazio beat Florence at home in the last league, and the league won three consecutive victories. The team has been in a strong state in the near future, and it can also win battles in a row. At present, it ranks seventh in the league with 16 points. Lazio’s offensive efficiency has improved, and the stability of the defense line has improved.

Bologna’s overall performance is quite stable. It has previously drawn against strong teams such as Juventus, Inter Milan and Naples, and it has a strong ability to score points in the main battle. Lazio, the opponent, has been strengthening in recent days, and it is also in a winning streak. Although the team’s performance in the away game is not good, most of its opponents are league teams, and they also have the ability to score points away from home. This time, the two teams collided, and Bologna, who performed very steadily, still had a chance to defend the unbeaten home, and the possibility of a draw between the two sides was not small.

Chapter one hundred and forty-two: Robert in his hometown was kicked out by the Brazilian Football Association.

After the 2014 World Cup, the Brazilian Football Association office

"Your hometown Robert, you are fired. What’s the matter with you? Twelve years ago, you performed very well. This year, your performance is so disappointing that you have humiliated our Brazilian football."

"David Genk, how did I lose the face of Brazilian football? I admit that my performance this year is a little poor, but I also led the team to complete the goal of securing four titles."

"I haven’t lost face, and my face has been thrown into the Pacific Ocean by you. I was defeated by Germany 0: 7 and the Netherlands 0: 5. You told me that I didn’t lose face, and I was so angry with you, you know?"

"These two games were accidents. It won’t happen again in the future. Don’t worry, but then again, my contract has expired anyway. It doesn’t matter."

"It doesn’t matter, haha, it’s killing me."

"Chairman Genk, what are you laughing at?"

"I tell you, your coaching career is over, hometown."

"What do you mean, make it clear?"

"I don’t know on other continents, at least in Europe and America, you can’t be the head coach of any national team, including the club team, and your home has been closed, which means you have no place in Brazil."

"What, who gave you the power, you are just the president of the Football Association?"

"President Barkson, he said to let me punish you, but he kicked you out of Brazil so that you could not coach in any team in Europe, America or even the world. I think it is the best punishment for you, Robert."

"What you said is true? I don’t believe it. "

"No, you don’t. Well, I’ll put President Barkson on the phone with you now."

After that, the phone was connected, and Barkson’s voice came: "Robert, leave Brazil now, or the consequences will be unimaginable."

"President Barkson, is it true what President Genk said?"

"Yes, it’s true, and Genk has reported it to me, and I agree with his decision to punish you."

"President Barkson, I didn’t break the law. Why confiscate my property?"

"You are not breaking the law, but it is similar to breaking the law, which is equivalent to breaking the law. Think about it, Brazil is a football kingdom and hosts the World Cup at home. As a result, you led the team to lose 12 goals in the semi-finals and the third and fourth finals, and lost the face of our country. " After that, Buckson hung up the phone.

"Did you hear that? You know, fans are scratching everywhere in China now, and many people have died. Do you think it’s your responsibility?"

"Well, I’ll leave. I’ll go. You’re too hard. As a player, I won the World Cup for my country. You didn’t mention my merits. This time, I did. You did this to me. I’m not reconciled."

"It’s because of your past contributions that your merits and demerits are at the end, or you may have to go to jail according to President Barkson’s meaning, understand?"

Robert slammed the door angrily in his hometown. Later, he found many national teams and clubs that were turned away, and he ran into a wall everywhere. He had no choice but to take a good trip and relax himself, and his chosen destination was China, an ancient oriental country.

Walking on the street in Sioux City, China, Robert of his hometown was ecstatic and shouted, "What a beautiful city. No wonder people say that there is Suzhou and Hangzhou under heaven, so it is really unnecessary to spread his name."

To celebrate the 100th anniversary of the founding of the Communist Party of China (CPC), a major revolutionary historical TV series "Midstream Hit the Water" produced by the Central Radio and Television General Station, filmed by the TV Drama Documentary Center of the General Station, and contracted by the China TV Drama Production Center Co., Ltd. landed on CCTV-1 for its prime-time premiere tonight!

Guided by the "Red Boat Spirit", the TV series Hit the Water in the Middle Stream tells the historical process of the birth, development and growth of the Communist Party of China (CPC) during the ten years from the May 4th Movement in 1919 to the victory in Jinggangshan in 1928.

　　Wu Guanghui, chief designer of Comac C919 and ARJ21, has won the national special prize for scientific and technological progress and the first prize for national defense scientific and technological achievements. A key model won the first prize of China Aviation Industry Corporation I and the first prize of the National Defense Science, Technology and Industry Committee.

　　"Many aircraft parts are made in China and fly in the sky every day. C919 has gone through nearly seven years, and has done a lot of design, calculation and experiments. I am definitely willing to take this plane first. "

　　— — Wu Guanghui

　　These days, in the commercial aircraft test center of China Commercial Aircraft Corporation, the newly-built Zhuqiao test hangar in Pudong is spacious and bright. In the hangar, the landing gear that originally supported the domestic large passenger plane C919 was all put into the landing gear cabin, and three air springs like "jacks" lifted the plane into mid-air. What is going on here is the ground resonance test and modal coupling test of the whole aircraft that must be completed before the first flight, which means that the C919 has officially entered the final sprint stage before the first flight.

　　C919 is a domestic large passenger plane independently designed and developed by China. It is a short-haul single-aisle narrow-body passenger plane with more than 150 seats. In the future, it will compete with internationally renowned commercial aircraft such as Airbus 320 series and Boeing 737 series for orders. The manufacturer China Commercial Aircraft Co., Ltd. recently announced that the C919 plans to make its first flight in the first half of 2017 and will fully launch the wide-body passenger aircraft project. It can be said that after nearly 10 years of hard work, China people’s dream of "big plane" will soon become a reality.

　　① Rigorous test to ensure safety.

　　To fly into the blue sky, a plane must first practice a pair of steel bars and iron bones. For the C919, which carries the dream of a big plane for Chinese people, the significance of the test is even more significant. This is the first large passenger plane made by China people, and its safety cannot be lost.

　　For this reason, C919 has undergone a series of tests like "torture". Among them, the 2.5g static test of the whole aircraft started in early November last year is the most severe and significant one since the birth of the C919.

　　This test mainly tests the strain and deformation of the "skeleton" of the body under constant external loading. In layman’s terms, this kind of test is to let the aircraft simulate the stress situation when challenging air flight on the ground, and go beyond the natural limit to verify how much force the aircraft can bear.

　　Before the start of the experiment, the researchers covered the whole body with white adhesive tape, which is a resistance strain gauge that can sensitively measure stress and strain close to the surface of the body, just like doing electrocardiogram for the plane. During the test, the load starts to rise at the level of 5%, and the load must be kept for 3 seconds every time. "The structure must be able to withstand the ultimate load for 3 seconds without damage." Zhou Liang Dao, deputy chief designer of the C919 passenger plane, said that the preparation behind the team took more than 300 days for this short three seconds.

　　With the continuous loading, the aircraft began to show obvious external reflection, and the wing began to tilt up a little. Finally, when the load reaches 100% of the test outline, the wing tip tilts up to nearly 2 meters, which is highly consistent with the strength analysis before the test, which shows that the test is successful and its strong "bones" and body are enough to support flying into the blue sky.

　　This is just a small step in the long March before the first flight of the plane. A passenger plane has to complete 13 static tests in 48 working conditions, including pressurization in the booster cabin, front lifting connection, main lifting connection, whole aircraft condition, vertical tail and rudder, as well as "three-bird test" such as iron bird, copper bird and electric bird and joint test of the whole aircraft system. Therefore, researchers have made independent innovations in system integration experiments.

　　In the comprehensive test hall of Shanghai Aircraft Design and Research Institute, the iron bird test-bed with little difference from the C919 real machine looks like an eagle with wings spread and its tail stuck high. Don’t underestimate this test-bed. Its full name is "Integrated Test-bed for Flight Control Hydraulic System", which mainly tests the landing gear, wings and other mechanical systems of aircraft. In order to ensure the authenticity of the system test, the iron bird test-bed is designed according to the 1:1 ratio of the real aircraft, so that the mechanical installation interfaces of the flight control, hydraulic and landing gear systems are the same as those of the aircraft.

　　Next to the Iron Bird Test Bench, there is also a "Copper Bird" that tests power supply systems such as power generation and distribution, and also restores the real state of the machine to 1:1 for equipment installation. "Iron Bird", "Copper Bird" and the avionics system test called "Electric Bird" will eventually be all connected, thus forming a "three-bird joint test" to simulate the state of the aircraft.

　　In the experiment, researchers conducted a comprehensive test on the aircraft system. Take the avionics system as an example. At most, there are more than 100,000 parameters in a test. These parameters should be tested one by one to find out the possible omissions in the design. "Our goal is not to take the fault to the sky." Yu Shenghui, senior engineer of the General Aerodynamics Department of Shanghai Aircraft Design and Research Institute, said.

　　According to the plan, six testing machines are carrying out joint testing of the whole machine system, and customer service engineering and airworthiness work are also being carried out simultaneously.

　　②C919 is genuine China goods.

　　As the first large passenger plane with completely independent intellectual property rights in China, C919 has been frequently questioned since it was established in 2006: an aircraft whose engine, avionics core processing system and some materials all depend on foreign products or technologies, why should it be said to be "made in China"?

　　In fact, to evaluate the innovation of C919, we may need to draw lessons from a fairy tale named Pony Crossing the River. This story is about a pony crossing a river. A cow next to it said, "The water is very shallow, just without a calf, so you can cross it." But the squirrel in the tree said, "The water is deep and will drown." So, is the river deep or shallow? Finally, the pony got off the river by himself and carefully waded to the other side. It found that the river was neither as shallow as the cow said, nor as deep as the squirrel said. The same is true for the development and innovation of C919. Everyone should not only see the major innovations achieved in the process of aircraft development, but also objectively admit the existing shortcomings.

　　According to international standards, judging whether an airplane is made in China or assembled depends on whether it meets three conditions. 1. Who owns the property right of the whole machine? Second, who is the core team to develop the whole machine? Third, who holds the key link in the development of the whole machine? For C919, the answer to these three questions is China.

　　The person in charge of Comac in China said that the property right of the C919 is owned by Comac in China. The team of Comac in China is the core of the development, and the key links such as aircraft design, final assembly, test flight and sales are in the hands of Comac in China.

　　As for foreign companies providing parts or technology, this is a common thing in the global aviation manufacturing industry. Aviation manufacturing giants such as Boeing and Airbus also use foreign products on many key components when developing aircraft.

　　However, for equipment like engines, the C919 chose the LEAP-X1C engine jointly developed by the United States and France, which is the only foreign starting power device selected by the C919. It should be said that the engine is indeed a major constraint in the development of China’s large aircraft, and it can only be sought from people at present. However, I believe that in 10 to 15 years, China will be able to develop its own advanced aero-engine for large aircraft.

　　③ Have a number of scientific and technological innovations.

　　Experts said that the C919 was completely designed and integrated independently, with outstanding technical indicators. It is the persistent innovation of researchers who have sharpened their swords for ten years that has led to the high-tech C919, which integrates many key technologies.

　　However, what did C919 look like when it was approved as one of the 16 major projects in the national medium-and long-term science and technology planning in January 2006? What difficulties may be encountered in the development? Due to the limitation of western aviation powers in technology introduction, China researchers have no idea and can only cross the river by feeling the stones.

　　In November 2008, the C919 project was launched. A large passenger aircraft joint engineering team composed of 468 experts from 47 domestic and foreign units, plus a large passenger aircraft expert consulting group composed of 20 academicians and experts, started from sketches and gradually sorted out the first batch of 14 special technical research projects that need to be started.

　　Among these key technologies, there are several that must be mentioned. For example, the "supercritical airfoil" that makes airplanes more fuel efficient. A large passenger airliner is an out-and-out "oil tiger". In order to reduce fuel consumption, the wing design of C919 uses a supercritical airfoil, which improves the cruise aerodynamic efficiency by more than 20% and reduces drag by about 8%.

　　Another unique innovation is the adoption of the third generation Al-Li alloy materials. It is the first time in China that the world’s advanced third-generation Al-Li alloy materials are widely used in the main structure of C919. Compared with ordinary aluminum alloy, this lightweight metal material with high damage resistance has greater strength and lighter weight under the same strength, which is very important to realize the weight reduction of aircraft structure and greatly improve the service life of aircraft.

　　In addition, as the "brain" of the C919, the avionics system of the aircraft has realized "giving all the work to the network". Compared with the old version of the network, which was widely used before but had limited bandwidth, the new aviation bus communication protocol adopted by C919 not only has high bandwidth but also shares resources, which means that the signals that originally needed to be transmitted through several cables can now be transmitted by one cable. Experts said that this is like we need to run 10 trains from A to B, but we don’t need to build 10 railways. We only need a set of double-track railways and a reliable signal system.

　　According to Wu Guanghui, the chief designer of C919, the developers have planned 102 key technical problems, and many advanced materials have been applied on a large scale in domestic civil aircraft for the first time. The development process of millions of parts and airborne systems is highly parallel. In order to overcome these technical difficulties, 22 provinces and cities, more than 200 enterprises, 36 universities and hundreds of thousands of industrial personnel participated in the development of C919 large passenger aircraft, and 16 material manufacturers and 54 standard parts manufacturers including Baosteel became suppliers or potential suppliers of large passenger aircraft projects.

　　Our reporter Peng Xunwen