đề thi toán đại học khối a năm 2011 va dap an

... tỉ số gi a khối lượng c a chất Y và khối lượng c a chất X là A. 1 2 A 4 A B. 2 1 A 4 A C. 2 1 A 3 A D. 1 2 A 3 A HD:   t T t T Y Y A X X A N A N A m N A . N m A N . A A N     ... Một thanh mảnh AB đồng chất tiết diện đều, chiều dài  , khối lượng m. Tại đầu B c a thanh người ta gắn một chất điểm có khối lượng m 2 . Khối tâm c a hệ (thanh và chất điểm) cách đầu A một ... Bỏ qua ma sát ở trục quay và sức cản c a môi trường. Tốc độ góc c a hệ (bàn và vật) bằng A. 0,25 rad/s B. 1 rad/s C. 2,05 rad/s D. 2 rad/s HD:   I . , I I I ' ' ' rad/ s I...

Ngày tải lên: 24/07/2014, 07:20

... has to do with the inhabitants’ irrigation system. The temple and palaces of Angkor were constructed around a series of artificial reservoirs and canals which were annually flooded to capacity ... readers' attention, sought to package the news more conveniently and attractively. In 1982, many publishers felt threatened by the new USA Today, a national daily newspaper that used a page-wide, ... non-verbal signals such as caressing and touching, to affirm their friendship. Marriage and similar (20) ______ relationships can also form the basis of lasting happiness. Third, job satisfaction...

Ngày tải lên: 13/06/2014, 16:26

Ngày tải lên: 29/08/2013, 14:39

Ngày tải lên: 30/08/2013, 11:10

... Cho hình chóp S.ABCD có đáy ABCD là hình thang vuông tại A và D; AB = AD = 2a; CD = a; góc gi a hai mặt phẳng (SBC) và (ABCD) bằng 60 0 . Gọi I là trung điểm c a cạnh AD. Biết hai mặt phẳng (SBI) ... tại hai điểm phân biệt A, B. Kẻ đường cao IH c a ∆ABC, ta có S ∆ ABC = · 1 IA.IB.sin AIB 2 = sin · AIB Do đó S ∆ ABC lớn nhất khi và chỉ khi sin · AIB = 1 ⇔ ∆AIB vuông tại I ⇔ IH = IA 1 2 = ... π π π π Câu IV. Từ giả thi t bài toán ta suy ra SI thẳng góc với mặt phẳng ABCD, gọi J là trung điểm c a BC; E là hình chiếu c a I xuống BC. 2a a 3a IJ 2 2 + = = S CIJ 2 IJ CH 1 3a 3a a 2 2 2 4 ì =...

Ngày tải lên: 30/08/2013, 14:10

Ngày tải lên: 05/09/2013, 13:52

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Ngày tải lên: 07/03/2014, 08:20

Ngày tải lên: 05/08/2014, 19:21

Ngày tải lên: 05/08/2014, 19:21

Ngày tải lên: 05/08/2014, 19:21

Ngày tải lên: 05/08/2014, 19:21

Ngày tải lên: 27/12/2013, 11:17

... ice, traveling at more than twenty-five miles per hour and slapping a puck at more than 125 miles per hour, makes the sport ______than many other ports. A. more than dangerous B. is more dangerous ... Questrion 62: Maria says she'd like to have been put in a higher class. A. Maria wishes she will be put in a higher class. B. Maria wishes that she had been put in a higher class. C. Maria wishes ... C. as more dangerous D. more dangerous Questrion 19: A few animals sometimes fool their enemies_______ to be dead. A. have been appearing B. by appearing C. to be appearing D. to appear Questrion...

Ngày tải lên: 25/07/2014, 23:20

... Astronomers also think that perhaps a small (66)_______ of water vapor could be found on Mars. In 1887, an Italian astronomer, Giovanni Schiaparelli, discovered marking on Mars' surface. These markings ... somewhat like eggs when they are cooked. They have the advantage of having lower cholesterol rates, and they can be scrambled or used in baking. One disadvantage, however, is that they are not ... somewhat like eggs when they are cooked. They have the advantage of having lower cholesterol rates, and they can be scrambled or used in baking. One disadvantage, however, is that they are not...

Ngày tải lên: 26/07/2014, 04:20

... selling a variety of freshwater fish, such as goldfish, suppies, and angelfish. While most freshwater aquaria are set up as community tanks (45) _____ a variety of peaceful species, many aquarists ... many types of cichlid, catfish, characin, and killifish. Garden (48) _____ are in some ways similar to freshwater tanks, but are usually (49) _____ larger and exposed to the ambient climatic ... Unless c. Although d. Because 17/ He spent a whole day ______ the radio. a. repairing b. to repair c. repaired d. repair a. attractive b. attractiveness c. attractively d. attraction 24/ Many...

Ngày tải lên: 26/07/2014, 14:20

... while. a. for b. with c. at d. in 8. We would be glad _____ the chance to meet her. a. for b. over c. of d. in 9. Can you play any musical instrument? – I can play _____ guitar. a. a b. an ... rest 1. a. celebration b. entertaiment c. traditional d.preparation 2. a. special b. polite c. happy d. really 3. a. postman b. envelope c. occasion d. everyone 4. a. lucky b. banner c.begin ... would not call myself an avid stamp collector a. interesting b. exciting c. amateur d. enthusiastic 13. He got the stamps and threw away the envelopes. a. kept b. discarded c. gathered d....

Ngày tải lên: 26/07/2014, 14:20

... a. that Anna Winlock b. Anna Winlock,who c. as Anna Winlock d. Anna Winlock then 23. _________ the dollar as its monetary unit in 1878. a. Adopted by Canada, b. Canada adopted c. It was adopted ... who was elected the first woman mayor of Chicago in 1979. a. It was Jane Byrne b. Jane Byrne c. That Jane Byrne d. When Jane Byrne 20. The first American novelist to have a major impact on ... adopted by Canada d. The Canada adoption of 24. _____ that the capital of South Carolina was moved from Charleston to Columbia. a. In 1790 was b. There was in 1790 c. In 1790 d. It was in 1790...

Ngày tải lên: 26/07/2014, 14:20

... She began to study French was five years ago. c. She began studied French five years ago. d. She began to study French in five years ago. 1 ĐỀ THI THỬ ĐẠI HỌC KHỐI D NĂM 2011 MÔN: ANH ... ______ pack the car for our journey. a. so that b.in case c.in order to d.and 46.After going for a long walk this morning, everyone ______ very angry at lunch time. a. had b.was c.made d.were ... a. for b.about c.with d.in 4. Jack was late because he wasn’t aware ______ the time. a. of b.about c.with d.at 5.Please turn down the radio ______ get to sleep. a. so to b.so that I can...

Ngày tải lên: 26/07/2014, 14:21

... plants and animals can survive. All deserts have very little water. This means that only animals and plants that can (2) water for long periods of time can exist in the desert. Plants in ... bulletins, annuals, trade journals, and academic journals are published on a regular basic. There are some 40 women's magazines and over 60 dealing with particular sports, games, hobbies, and pastime. ... replaced magazine B). almost all magazines are printed in English C). home decorating magazines are dramatic D). the author is fond of magazines VI. Read the passage and then choose the best answer...

Ngày tải lên: 27/07/2014, 06:20