Cho biết nguyên tử khối: H = 1; C = 12; N = 14; O = 16; Na = 23; Al = 27; S = 32; Fe = 56; Ba = 137.

Cho hình vẽ sau của amino acid X trong môi trường pH = 6 dưới tác dụng của điện trường:

Chất X không thể là

Nền kinh tế nước ta gồm mấy chủ thể cơ bản?

Tập xác định của hàm số \(y=\frac{\text{sin}x}{2-2\text{cos}x}\) là

Cho cấp số nhân có $u_2=\dfrac{1}{4}$ ; $u_5=16$ thì công bội và số hạng đầu lần lượt là

Trong hệ thống kĩ thuật mạch kín, thành phần nào sau đây là yếu tố chính để phân biệt với hệ thống mạch hở?

Nhiệt độ ảnh hưởng đến cây trồng như thế nào?

RAM là bộ nhớ gì?

Đoạn trích phản ánh nhận thức và cách lý giải của con người thời cổ đại về điều gì?

Đất xám bạc màu là:

Sử liệu là gì?

Read the following passage about Edible Landscapes for Community Resilience 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.

Urban food forests are becoming popular in many cities around the world. These special gardens (18)_________. Food forests which contain fruit trees, berry bushes, and edible plants help people learn about growing food and nature. These community gardens provide fresh food; (19)_________. The food is free for everyone to harvest; this system builds community connections and food security. Many cities now support these projects, recognizing their benefits and (20)_________. Unlike traditional parks, food forests need less water and maintenance. They grow many different plants together, which helps protect against pests and diseases naturally. Children love visiting these spaces to pick berries and learn about where food comes from.

Climate change makes growing local food more important than ever. When communities grow food together, (21)_________. Food forests can help reduce the urban heat island effect by providing shade and cooling the air. They also support important pollinators like bees and butterflies that help all plants grow better. Some food forests include community kitchens (22)_________. These spaces become centers for education about healthy eating and traditional cooking methods. Elderly community members often share their knowledge of plants and recipes with younger generations. This creates valuable connections between different age groups and cultures.

The family is ____ basic unit of society and is important to both individuals and communities.

Ví dụ nào sau đây không phải đặc điểm thích nghi ở sinh vật?

Read the following passage 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.

Robots are useful for exploring and working in space. In particular, many robots have been sent to explore Mars. Such robots have usually looked like a box with wheels. Though these robots are useful, by their very nature they are unreliable, extremely expensive, and they break easily. Also, they cannot do very many tasks. Because of these problems, scientists have been developing a new and unusual kind of robot. These new robots move like snakes, so they have been given the name “snakebots.”

But how can such a robot shape be made? A snakebot is built like a chain made of about thirty parts, or modules. Each module is basically the same in that they all have a small computer and a wheel to aid movement. The large computer in the “head” of the snake makes all of the modules in a snakebot work together. The modular design of the snakebot has many advantages. If one module fails, another can be added easily. Snakebot modules can also carry different kinds of tools, as well as cameras. Since each module is actually a robot in itself, one module can work apart from the rest if necessary. That is, all the modules can separate and move on their own, and then later, reconnect back into a larger robot.

Overall, the snakebot design is much simpler than that of common robots. Thus, snakebots will be much less expensive to build. For example, a robot recently sent to Mars cost over a hundred million dollars, whereas snakebots can cost as little as a few hundred dollars.

With their versatility and affordability, snakebots seem to be the wave of the future, at least as far as space robots are concerned.

In which paragraph does the passage explain how snakebots can be repaired? 

Đâu là phép đổi đúng khi đổi số \(15_{10}\) sang hệ nhị phân?