Đồng hồ chỉ mấy giờ?

Cho mạch điện như hình vẽ:

C = 500  pF;  L = 0,2  mH;  E = 1,5  V , lấy π 2 ≈ 10 . Tại thời điểm t = 0 , khoá K chuyển từ (1) sang (2). Thiết lập công thức biểu diễn sự phụ thuộc của điện tích trên tụ điện C vào thời gian. Điện tích cực đại trên tụ C vào thời gian

A. q = 0,75 cos 100000 π t + π ( n C )

B. q = 0,75 cos 100000 π t ( n C )

C.  q = 7,5 cos 1000000 π t − π 2 ( n C )

D.  q = 0,75 cos 1000000 π t + π 2 ( n C )

Phát biểu các định lí về mối quan hệ giữa cung nhỏ và dây căng cung đó trong một đường tròn.

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.

         Herman Melville, an American author best known today for his novel Moby Dick, was actually more popular during his lifetime for some of his other works. He traveled extensively and used the knowledge gained during his travels as the basis for his early novels. In 1837, at the age of eighteen, Melville signed as a cabin boy on a merchant ship that was to sail from his Massachusetts home to Liverpool, England. His experiences on this trip served as a basis for the novel Redburn (1849). In 1841 Melville set out on a whaling ship headed for the South Seas. After jumping ship in Tahiti, he wandered around the islands of Tahiti and Moorea. This South Sea island sojourn was a backdrop to the novel Omoo (1847). After three years away from home, Melville joined up with a U.S. naval frigate that was returning to the eastern United States around Cape Horn. The novel White-Jacket (1850) describes this lengthy voyage as a navy seaman. 

         With the publication of these early adventure novels, Melville developed a strong and loyal following among readers eager for his tales of exotic places and situations. However, in 1851, with the publication of Moby Dick, Melville's popularity started to diminish. Moby Dick, on one level the saga of the hunt for the great white whale, was also a heavily symbolic allegory of the heroic struggle of man against the universe. The public was not ready for Melville's literary metamorphosis from romantic adventure to philosophical symbolism. It is ironic that the novel that served to diminish Melville's popularity during his lifetime is the one for which he is best known today.

According to the passage, Moby Dick is__________.

A. symbolic of humanity fighting the universe

B. a single-faceted work

C. a short story about a whale

D. a 47 adventure

Read the following passage and choose the letter A, B, C, or D to indicate the answer to each of the following questions.

Carnegie Hall, the famous concert hall in New York City, has again undergone a restoration. While this is not the first, it is certainly the most extensive in the building’s history. As a result of this new restoration, Carnegie Hall once again has the quality of sound that it had when it was first built.

Carnegie Hall owes its existence to Andrew Carnegie, the wealthy owner of a steel company in the late 1800s. The hall was finished in 1891 and quickly gained a reputation as an excellent performing arts hall where accomplished musicians gained fame. Despite its reputation, however, the concert hall suffered from several detrimental renovations over the years. During the Great Depression, when fewer people could afford to attend performances, the directors sold part of the building to commercial businesses. As a result, a coffee shop was opened in one corner of the building, for which the builders replaced the brick and terra cotta walls with windowpanes. A renovation in 1946 seriously damaged the acoustical quality of the hall when the makers of the film Carnegie Hall cut a gaping hole in the dome of the ceiling to allow for lights and air vents. The hole was later covered with short curtains and a fake ceiling, but the hall never sounded the same  afterwards.

In 1960, the violinist Isaac Stern became involved in restoring the hall after a group of real estate developers unveiled plans to demolish Carnegie Hall and build a high-rise office building on the site. This threat spurred Stern to rally public support for Carnegie Hall and encourage the City of New York to buy the property. The movement was successful, and the concert hall is now owned by the city. In the current restoration, builders tested each new material for its sound qualities, and they replaced the hole in the ceiling with a dome. The builders also restored the outer walls to their original appearance and closed the coffee shop. Carnegie has never sounded better, and its prospects for the future have never looked more promising.

The word “it” in the first paragraph refers to_____

A. Carnegie Hall

B. New York City

C. a restoration.

D. a plan

Để tách CO₂ ra khỏi hỗn hợp với HCl và hơi nước, có thể dẫn hỗn hợp trên lần lượt qua các bình đựng các hóa chất nào dưới đây ?

A. NaOH và H₂SO₄ đặc

B. Na₂CO₃ và P₂O₅

C. H₂SO₄ đặc và KOH

D. NaHCO₃ và P₂O₅

In my summer holiday, I did not do something special and did not go somewhere special except Chamonix and Venice. Most of my holiday was showing friends of my parents and my grandparents the most important and the most beautiful places of Geneva and its surroundings.

I started the summer holiday before everyone (6 days before). That was because of my grandparents. Well, it first started off when my grand parents came. We were going by car where my grandmother wouldn't walk and I was walking with my grandfather. Because my grandfather likes walking and my grandmother doesn't. Well they stayed for 1 month and went back to Turkey. The next visitors were my mother's schoolmates (can you believe it!!). They stayed one month as well. We kind of went to same places, when they were gone that was the fun. We went to Chamonix and Venice.

The best thing there was the Jacuzzi and the pool. In Chamonix, the mountains haven. The highest there was Mont-Blanc and Auguille du Midi. We climbed with a cable car; it was totally amazing and extremely cold. This point was 3842 meters high. And, of course, I should not forget Venice, it was also a haven but I didn't see much because we had small amount of time. The most amazing thing was the square of San Marco Polo and then the gondolas.

The thing I really liked about my holiday was getting a brand new VW Passat and seeing my grandparents (first time in two years).

1. Rice- cooking festival

2.Fire- making contest

3.Water- fetching contest

People can do something :

_Changing Your Daily Habits