Cho một số ester đồng phân cấu tạo của nhau có công thức phân tử C₄H₈O₂. Trong số các ester đồng phân cấu tạo ở trên, không có ester

Read the following leaflet 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 7 to 12. 

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• Up to 50% off on over 1,000 items, including fresh (9)___, electronics, and personal care products.

• Special "Buy One, Get Another at 10%" deals on selected products.

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Don’t miss our interactive events, where customers can enjoy a large (10)______of free samples, fun games, and live demonstrations. Be sure to (11)______for our rewards program for additional discounts and collect points on every purchase.

Celebrate (12)______fantastic year with us at WinMart—visit any store or shop online to grab these limited-time deals!

Tình huống nào sau đây là thể hiện chủ thể thực hiện tốt nghĩa vụ cơ bản của công dân?

Phương án nào sau đây nêu đúng khả năng lưu trữ của thiết bị số?

Cho phương trình \(4^{x}-2 m \cdot 2^{x}+2 m+2=0\). Với \(m\) là tham số thực.

Khi \(m=3\), tổng tất cả các nghiệm của phương trình bằng:

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? 

Read the passage carefully. Choose an option (A, B, C or D) that best answers each question from 23 to 30.

1. How do children learn about wildlife? And is what they learn the sort of thing they should be learning? It is my belief that children should not just be acquiring knowledge of animals but also developing attitudes and feelings towards them based on exposure to the real lives of animals in their natural habitats. But is this happening?

2. Some research in this area indicates that it is not. Learning about animals in school is often completely disconnected from the real lives of real animals, with the result that children often end up with little or no understanding or lasting knowledge of them. They learn factual information about animals, aimed at enabling them to identify them and have various abstract ideas about them, but that is the extent of their learning. Children's storybooks tend to personify animals as characters rather than teach about them.

3. For direct contact with wild and international animals, the only opportunity most children have is visiting a zoo. The educational benefit of this for children is often given as the main reason for doing it but research has shown that zoo visits seldom add to children's knowledge of animals – the animals are simply like exhibits in a museum that the children look at without engaging with them as living creatures. Children who belong to wildlife or environmental organizations or who watch wildlife TV programmes, however, show significantly higher knowledge than any other group of children studied in research. The studies show that if children learn about animals in their natural habitats, particularly through wildlife-based activities, they know more about them than they do as a result of visiting zoos or learning about them in the classroom.

4. Research has also been done into the attitudes of children towards animals. It shows that in general terms, children form strong attachments to individual animals, usually their pets, but do not have strong feelings for animals in general. This attitude is the norm regardless of the amount or kind of learning about animals they have at school. However, those children who watch television wildlife programs show an interest in and affection for wildlife in its natural environment, and their regard for animals in general is higher.

What is the word "disconnected" in paragraph 2 closest in meaning to?

Một đầu đạn khối lượng 10g được bắn ra khỏi nòng của một khẩu súng khối lượng 5kg với vận tốc 600m/s. Nếu bỏ qua khối lượng của đầu đạn thỉ vận tốc giật của súng là

Việt Nam nằm ở mảng kiến tạo nào sau đây?

Tom said: “Why do you keep staring at me, Janet?”

Thị trường bao gồm những yếu tố cơ bản nào?

Việt Nam đặt dưới sự “bảo hộ” của người Pháp. Nam Kỳ là xứ thuộc địa. Bắc kỳ là đất bảo hộ. Trung kỳ giao cho triều đình quản lí”. Điều khoản trên được qui định trong Hiệp ước nào?

Con hãy lựa chọn đáp án Đúng hoặc Sai

Bài thơ Thu điếu thể hiện một tâm hồn gắn bó với thiên nhiên, đất nước, một tấm lòng yêu nước thầm kín và sâu sắc, đúng hay sai?

Dòng điện có chiều quy ước là chiều chuyển động của

Which word or phrase is the best fits the numbered blank (13)

Nhận định nào sau đây về sinh trưởng sơ cấp và sinh trưởng thứ cấp ở thực vật hai lá mầm là SAI?

Muốn xuất hiện một dòng điện cảm ứng trong một khung dây kín, ta cần

Khi hoà tan sodium carbonate (\(Na_2CO_3\)) vào nước, quá trình sau đây xảy ra:

\(CO_3^{2-} + H_2O \rightleftharpoons HCO_3^- + OH^-\)

Theo thuyết Brønsted - Lowry, ion \(CO_3^{2-}\) đóng vai trò gì trong quá trình trên?

Công thức tính biến thiên enthalpy của phản ứng theo năng lượng liên kết là

Sử dụng thiết bị nào dưới đây để đo điện trở?