Đặc điểm động cơ đốt trong trên ô tô?

A. Tốc độ quay cao

B. Kích thước và trọng lượng nhỏ, gọn

C. Thường làm mát bằng nước

D. Cả 3 đáp án trên

Căn cứ vào Atlat Địa lí Việt Nam trang 28, hãy cho biết ở Duyên hải Nam Trung Bộ, các nhà máy thuỷ điện nào sau đây được xếp theo thứ tự từ bắc vào Nam?

A. A Vương, Sông Hinh, Vĩnh Sơn, Đa Nhim, Hàm Thuận - Đa Mi

B. A Vương, Vĩnh Sơn, Sông Hinh, Đa Nhim, Hàm Thuận - Đa Mi

C. A Vương, Sông Hinh, Đa Nhim, Hàm Thuận - Đa Mi, Vĩnh Sơn

D. A Vương, Vĩnh Sơn, Sông Hinh, Hàm Thuận - Đa Mi, Đa Nhim

Dung dịch axit sunfuric đặc (D = 1,83 g/ml) chứa 6,4% nước. Hãy cho biết trong 1 lít dung dịch axit này có bao nhiêu mol H 2 SO 4

Dựa vào Atlat Địa lí Việt Nam và kiến thức đã học, hãy chứng minh miền núi nước ta có địa hình đa dạng.

Cho mạch điện như hình vẽ. Đèn dây tóc Đ ghi 12V – 6 W. Nguồn điện có suất điện động 15V, có điện trở trong 1 Ω và R 1 = 4,8 Ω. Biến trở R b có giá trị trong khoảng từ 0 đến 144 Ω. Các tụ điện có điện dung C 1 = 2µF; C 2 = 3µF. Coi điện trở của đền D không thay đổi. Cho N di chuyển đều từ đầu A đến đầu B của biến trở trong thời gian t = 5s. Trong khoảng thời gian đó, cường độ dòng điện tức thời qua am pe kế là:

A. 2µA chiều M đến N.

B. 2µA chiều N đến M

C. 14,4µA chiều N đến M.

D. 14,4 µA chiều M đến N

Đặc điểm nào của Biển Đông có ảnh hưởng nhiều nhất đến thiên nhiên nước ta?

A. Nóng, ẩm và chịu ảnh hưởng của gió mùa.

B. Có diện tích lớn gần 3,5 triệu km².

C. Biển kín với các hải lưu chạy khép kín.

D. Có thềm lục địa mở rộng hai đầu thu hẹp ở giữa.

hồng nhung chipu nói ảo v~ : thế không biết thì không được đăng à !

Read the following passage on transport, and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 43 to 50.

    The Sun today is a yellow dwarf star. It is fueled by thermonuclear reactions near its center that convert hydrogen to helium. The Sun has existed in its present state for about four billion six hundred million years and is thousands of times larger than the Earth.

    By studying other stars, astronomers can predict what the rest of the Sun’s life will be like. About five billion years from now, the core of the Sun will shrink and become hotter. The surface temperature will fall. The higher temperature of the center will increase the rate of thermonuclear reactions. The outer regions of the Sun will expand approximately 35 million miles, about the distance to Mercury, which is the closest planet to the Sun. The Sun will then be a red giant star. Temperatures on the Earth will become too high for life to exist.

    Once the Sun has used up its thermonuclear energy as a red giant, it will begin to shrink. After it shrinks to the size of the Earth, it will become a white dwarf star. The Sun may throw off huge amounts of gases in violent eruptions called nova explosions as it changes from a red giant to a white dwarf.

          After billions of years as a white dwarf, the Sun will have used up all its fuel and will have lost its heat. Such a star is called a black dwarf. After the Sun has become a black dwarf, the Earth will be dark and cold. If any atmosphere remains there, it will have frozen over the Earth’s surface.

It can be inferred from the passage that the Sun ___.

A. has been in existence for 10 billion years

B. is approximately halfway through its life as a yellow dwarf

C. will continue to be a yellow dwarf for another 10 billion years

D. is rapidly changing in size and brightness

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.

-"______" “Yeah, down this street, on the left”

A. Is there a station near here?

B. How often does the train come? 

C. Is this a train station?

D. Would you like to go by train?

Read the following passage and blacken the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following questions.

In the American colonies there was little money. England did not supply the colonies with coins and did not allow the colonies to make their own coins, except for the Massachusetts Bay Colony, which received permission for a short period in 1652 to make several kinds of silver coins. England wanted to keep money out of America as a means of controlling trade: America was forced to trade only with England if it did not have the money to buy products from other countries. The result during this pre-revolutionary period was that the colonists used various goods in place of money: beaver pelts, Indian wampum, and tobacco leaves were all commonly used substitutes for money. The colonists also made use of any foreign coins they could obtain. Dutch, Spanish, French, and English coins were all in use in the American colonies.

During the Revolutionary War, funds were needed to finance the world, so each of the individual states and the Continental Congress issued paper money. So much of this paper money was printed that by the end of the war, almost no one would accept it. As a result, trade in goods and the use of foreign coins still flourished during this period.

By the time the Revolutionary War had been won by the American colonists, the monetary system was in a state of total disarray. To remedy this situation, the new Constitution of the United States, approved in 1789, allowed Congress to issue money. The individual States could no longer have their own money supply. A few years later, the Coinage Act of 1792 made the dollar the official currency of the United States and put the country on a bimetallic standard. In this bimetallic system, both gold and silver were legal money, and the rate of exchange of silver to gold was fixed by the government at sixteen to one

It is implied in the passage that at the end of the Revolutionary War, a paper dollar was worth

A. exactly one dollar

B. just over one dollar

C. just under one dollar

D. almost nothing