Bài thơ của Chiyo được triển khai dựa trên phát hiện nào?

Khí nitrogen được tạo thành từ nguyên tử nào?

Trong tự nhiên, magnesium có 3 đồng vị bền là ²⁴Mg, ²⁵Mg và ²⁶Mg. Phương pháp phổ khối lượng xác nhận đồng vị ²⁶Mg chiếm tỉ lệ phần trăm số nguyên tử là 11%. Biết rằng nguyên tử khối trung bình của Mg là 24,32. Tính % số nguyên tử của đồng vị ²⁴Mg và ²⁵Mg.

1. % ²⁴Mg = %.

Chọn đáp án đúng.

Khi sản phẩm chuyển hoá được tạo ra đủ với nhu cầu của tế bào, cơ chế nào sau đây được diễn ra để điều hoà quá trình chuyển hoá vật chất?

Loại công cụ nào gắn liền với nền văn minh thông tin?

Read the following passage about Choosing a career and mark the letter A, B, C or D on your answer sheet to indicate the option that best fits each of the numbered blanks from 18 to 22.

          Choosing a career is a significant decision (18) _________. However, choosing a career can be a daunting task. To make an informed decision, it is essential to consider various factors, such as personal interests, skills, and values.

          One of the most important factors to consider is personal interests. (19) _________. By pursuing a career that aligns with your passions, you are more likely to be motivated and satisfied.

          Another important factor is skills and abilities. Self-awareness is the key to (20) _________. Identifying your strengths and weaknesses can help you choose a career path that suits your skills and talents.

          In addition to personal interests and skills, it is crucial to consider the job market and industry trends. (21) _________. Researching different career paths and staying up-to-date on industry developments can help you make informed decisions.

          To make the most of your career journey, it is essential to be proactive and take steps to develop your skills and network with professionals in your desired field. (22) _________. By continuously learning and adapting, you can increase your chances of success.

Người La Mã cổ đại đã sáng tạo ra loại chữ viết nào sau đây?

Đại lượng nào dưới đây là đại lượng vectơ?

Nguyên tắc bổ sung không được thể hiện trong cấu trúc hay cơ chế nào sau đây?

Read the following passage about Huawei company and mark the letter A, B, C or D on your answer sheet to indicate the best answer to each of the following questions from 23 to 30.

Huawei is a multinational company that makes  telecommunications  parts for  mobile phones , network equipment  and other high-tech  devices . It is the second largest such company in the world. Huawei has its headquarters  in Shenzhen, which became China’s first special economic zone  in 1979.

The Chinese technology company, which was founded  about 20 years ago, has over 100,000 workers in all parts of the world, more than Microsoft.  Most of the company is owned by its  employees .  Huawei started out in the rural  areas in China. In those days most of the telecom contracts  went to  state-owned  Chinese or  foreign  firms. As the company grew, it took hold of urban markets in big Chinese cities and in 1997 it  expanded to other countries.

Today, Huawei is the second biggest manufacturer of telecom equipment, after Ericsson. In 2011,  annual  sales  is expected to be about $12 billion dollars and  likely to get three times as high within the next ten years. Working for Huawei is something many young Chinese engineers and IT workers dream of. The 1.5 square km site  has modern apartments that can be rented, its own hospital, restaurants and bars where employees  can go to in their free time. For Chinese standards workers are well-paid. Although   Huawei has been concentrating  on making telecom parts and whole networks, the company is also looking into other industries in an  attempt to diversify and grow. At Shenzhen  engineers  are experimenting on new forms of video conferencing, a branch  that is expanding rapidly . The Chinese hi-tech giant  is also starting to produce cloud-based  hardware and computers that work  out of the box . 

Even though Huawei is one of the world leaders in producing mobile phone parts it is also pushing into the consumer market with its own  brand  of computers, tablets and smartphones. So far Huawei has failed  to reach  the American market because of security  reasons. The American  government  thinks it has connections  with the Chinese  military and is afraid it will spy  on the American  public 

In which paragraph does the writer mention Huawei’s efforts to enter the consumer electronics market?  

Read the following passage about How Failures Led to Breakthroughs and mark the letter A, B, C or D on your answer sheet to indicate the best answer to each of the following questions from 23 to 30.

Many important discoveries happened because of mistakes and unexpected accidents. Alexander Fleming found penicillin when he left his laboratory messy before going on holiday. After vacation, he saw mold growing on his experiment plate. Fleming noticed this mold killed bacteria around it very effectively. This fortunate accident later saved millions of lives around the world. Scientists call finding valuable things by chance "serendipity," which happens often in research.

The Post-it Note began as a mistake that seemed useless at first. In 1968, Spencer Silver tried making a strong glue for 3M company but created a weak one instead that didn't stick permanently. Nobody knew what to do with this disappointing result for several years. Then his colleague Arthur Fry realized this "failure" could make perfect bookmarks that wouldn't damage pages when removed. This weak adhesive eventually became one of the most popular office products worldwide, changing how people work.

In cooking, many favorite foods came from kitchen errors and quick substitutions. Ruth Wakefield invented chocolate chip cookies when she ran out of baker's chocolate and used broken pieces of semi-sweet chocolate instead. She thought they would melt completely in the dough, but they kept their shape during baking. Potato chips were created when chef George Crum made extremely thin potatoes to annoy a customer who repeatedly complained about thick fries. Surprisingly, the customer loved them and ordered more!

These fascinating stories teach us that mistakes can lead to new opportunities and unexpected innovations. Thomas Edison said about his many failed light bulb attempts, "I haven't failed. I've just found 10,000 ways that don't work." This positive attitude shows we should see errors as valuable learning chances. Smart people don't fear making mistakes in their work; they fear missing opportunities to learn from them and discover something amazing.

The word “fortunate” in paragraph 1 is OPPOSITE in meaning to _________.

Điện tích của một electron có giá trị bằng bao nhiêu?

Đọc đoạn trích sau đây và trả lời câu hỏi:

Nghe tiếng chuông điện, Phượng chạy ra cửa. Trước hai cánh cổng sắt là một phụ nữ nông thôn trạc năm mươi, người thon gọn trong cái áo bông chần hạt lựu. Chiếc khăn len nâu thắt ôm một khuôn mặt rộng có cặp mắt hai mí đằm thắm và cái miệng tươi. Người phụ nữ đeo một cái tay nải nặng, dáng vừa đi bộ từ ga xe lửa về, không có cái vẻ ngác ngơ lạ lẫm, nhưng hai con mắt đậm nỗi bồi hồi.

(Ma Văn Kháng, Mùa lá rụng trong vườn, Ngữ văn 12, tập hai, NXB Giáo dục Việt Nam, 2018)

Xác định phương thức biểu đạt chính trong đoạn trích trên.

Hai xe ô tô chạy cùng chiều trên một đoạn đường thẳng với vận tốc 100 km/h và 80 km/h. Tính vận tốc của xe thứ nhất so với xe thứ 2. Chọn chiều dương là chiều chuyển động của hai xe.

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 28 to 34. Foot-racing is a popular activity in the United States. It is seen not only as a competitive sport but also as a way to exercise, to enjoy the camaraderie of like-minded people, and to donate money to a good cause. Though serious runners may spend months training to compete, other runners and walkers might not train at all. Those not competing to win might run in an effort to beat their own time or simply to enjoy the fun and exercise. People of all ages, from those of less than one year (who may be pushed in strollers) to those in their eighties, enter into this sport. The races are held on city streets, on college campuses, through parks, and in suburban areas, and they are commonly 5 to 10 kilometers in length. The largest footrace in the world is the 12-kilometer Bay to Breakers race that is held in San Francisco every spring. This race begins on the east side of the city near San Francisco Bay and ends on the west side at the Pacific Ocean. There may be 80,000 or more people running in this race through the streets and hills of San Francisco. In the front are the serious runners who compete to win and who might finish in as little as 34 minutes. Behind them are the thousands who take several hours to finish. In the back of the race are those who dress in costumes and come just for fun. One year there was a group of men who dressed like Elvis Presley, and another group consisted of firefighters who were tied together in a long line and who were carrying a fire-hose. There was even a bridal party, in which the bride was dressed in a long white gown and the groom wore a tuxedo. The bride and groom threw flowers to bystanders, and they were actually married at some point along the route.

Which of the following is NOT mentioned in this passage?

Chọn câu sai. Trong chuyển động thẳng nhanh dần đều thì

Ở khu vực Mỹ Latinh không có sơn nguyên nào?

Gọi $\overline{A}$ là giá trị trung bình, $\Delta A'$ là sai số dụng cụ, $\overline{\Delta A}$ là sai số ngẫu nhiên, $\Delta A$ là sai số tuyệt đối. Sai số tỉ đối của phép đo là