... N 0 /64 Số hạt đã phân rã N 0 /2 3 N 0 /4 7 N 0 /8 15 N 0 /16 31 N 0 /32 63 N 0 /64 Tỉ lệ % đã rã 50% 75 % 87. 5% 93 .75 % 96. 875 % Tỉ lê đã rã và còn lại 1 3 7 15 31 63 Ứng dụng phóng xạ : Xác định ... chúng có cùng tính chất hóa học b. Khối lượng hạt nhân. Đơn vị khối lượng hạt nhân 1u = 12 1 khối lượng nguyên tử cacbon 12 6 C, 1u = 1,66055.10 - 27 kg m p = 1,0 072 76u...
Ngày tải lên: 06/10/2012, 08:49
!-LUYEN THI DAI HOC 7-!
... bằng sắt tráng thi c ( sắt tây ) nếu trên bề mặt vật đó có vết xây xát sâu tới lớp sắt bên trong , nếu để trong không khí ẩm thì có hiện tượng gì ? A. Sắt bị ăn mòn nhanh B. Thi c bị ăn mòn ... thì có hiện tượng gì ? A. Sắt bị ăn mòn nhanh B. Thi c bị ăn mòn nhanh C, Sắt , thi c đều bị ăn mòn D. Sắt , thi c không bị ăn mòn Câu 25 : Cho quỳ tím vào các dung dịch riêng biệt sau đây
Ngày tải lên: 06/07/2013, 01:26
LUYỆN THI TNPT
... how things fall. He was the first person to (6)__ experiments about this problem. Before him, people thought that heavy things always fell faster (7) _ light things. He found out that this ... could solve this mathematical problem. a. This mathematical problem could be solved. b. This mathematical problem couldn’t be solved. c. This mathematical problem couldn’t been solved. d. This mathema...
Ngày tải lên: 16/07/2013, 01:26
Ôn thi TN- Test 7
... sentence I’ve got no idea…………………. a. what does this sentence mean b. what this sentence means c. what this sentence’s meaning d. what the meaning of this sentence 43. Choose the underlined part ... quite sure this business will……… a. paying b. pay for c. pay off d. paid 37. Choose the best answer to complete the following sentence Could you stand………for me and teach my English class this ev...
Ngày tải lên: 21/07/2013, 01:27
Ôn Thi TNPT- Test 16 & 17
... They've translated Nguyen Du 's novel "Kieu" into several languages. A. Nguyen Du's novel "Kieu" has been translated into several languages. B. Nguyen Du's ... Du's novel "Kieu" has translated into several languages. C. Nguyen Du's novel "Kieu" had translated into several languages. D. Nguyen Du's novel "Kieu&...
Ngày tải lên: 02/08/2013, 01:25
Ôn Thi TNPT Test 18
... ÔN LUYỆN KIẾN THỨC THI TỐT NGHIỆP THPT – 2009 PRACTICE TEST 18 (April 18 th , 2009) Questions 1-2: Choose one word whose underlined ... wooden D. wooden round large beautiful 16. He's a man with a A. thin long face B. face long and thin C. long thin face D. thinly long face 17.1 kept them in the A. metal black small box B. ... sentence to be correct by circling letter A, B,...
Ngày tải lên: 04/08/2013, 01:25
... this exams 30. He thinks learning English is easy. A. He thinks it is not easy to learn English B. He thinks it is easy to learn English B. He thinks it is not easy learning English D. He thinks ... passed the driving test! ” A. I congratulated Jerry on passing her driving test B. I told that Jerry had passed her driving test C. I told Jerry that she had done well in her driving tes...
Ngày tải lên: 23/07/2014, 16:20
ĐỀ LUYỆN THI HSG – SỐ 7 ppsx
... computer had been worked out over two centuries ago by a man (41)_____ Charles 1 ĐỀ LUYỆN THI HSG – SỐ 7 Câu 1: Children will work hard if the lessons are _____. A. expressing B. inquiring ... long as Câu 14: My father asked me _____ of the film. A. what do you think B. what I think C. what I thought D. what did you think Câu 15: Her eyes were red and puffy _____ she had b...
Ngày tải lên: 25/07/2014, 20:20
ÔN THI TỐT NGHIỆP NĂM 2011 – TEST 7 ppsx
... 28: Don't you think you have gained some weight? A. Are you getting on well with your weight? B. You have put on some weight, haven't you? C. You shouldn't think about your weight, ... haven't you? C. You shouldn't think about your weight, OK? D. Don't you think weight is something you have gained? Câu 29: They're my two brothers, _______ are architec...
Ngày tải lên: 26/07/2014, 14:20
LUYỆN THI TNPT TEST 7 ppsx
... suddenly that c. such suddenly as d. so suddenly as 10.1 do not like ice cream ________ LUYỆN THI TNPT TEST 7 Choose the word which is stressed differently from the rest. 1. a. acquaintance ... you're not! a. Try not to say anything about your illness. b. Tell it to me if you are ill. c. If you are ill, you can say it. d. Don't pretend to be ill! 47. I deleted t...
Ngày tải lên: 02/08/2014, 01:20
LUYỆN THI TNPT TEST 8 doc
... Environmental pollution thought to be one of the most serious problems. => are thought LUYỆN THI TNPT TEST 8 Choose the word which has the underlined part pronounced differently from the rest. ... usually has a set of rules within which a person has to obey in order to succeed in accomplishing the desired objective. These commonly agreed boundaries exist so as to test p...
Ngày tải lên: 02/08/2014, 01:20
LUYỆN THI TNPT TEST 9 pot
... you are in need, ask Linda for help. d. When Linda is busy, you should help her. LUYỆN THI TNPT TEST 9 1. a. composed b. advised C. practised d. exposed 2. a. hummock b. human C. honor ... a. Smoking is not banned in this office. b. It's OK if you smoke in this office. c. There is not smoke in this office. d. You are not allowed to smoke in this office. 47. Maria di...
Ngày tải lên: 02/08/2014, 01:20
LUYỆN THI TNPT TEST 10 pdf
... the flu, _______ a. as attended the meeting b. without attending the meeting LUYỆN THI TNPT TEST 10 Choose the word which has the underlined part pronounced differently from the rest. ... planning _______ for London. Can you _______ me with the things. a. left / helping b. to leave / help c. leaving / to help d. leave / helped 10. Parents ________ take good care of their...
Ngày tải lên: 02/08/2014, 01:20
Luyện thi TNPT TEST 11 pptx
... b. so that not to be found c. but not be found d. for they could not be found Luyện thi TNPT TEST 11 Choose the word which is stressed differently from the rest. 1. a. domestic b. ... was taken when I was about 11 years old. I was sitting in a little red rocking chair made by my grandfather reading a book. I am 28 years old now and one of my greatest hobbies is readin...
Ngày tải lên: 02/08/2014, 01:20
LUYỆN THI TNPT TEST 7 docx
... cancelled c. will be cancelling d. will have cancelled 27. We _______ much news of him since he _______ the LUYỆN THI TNPT TEST 7 Choose the word which is stressed differently from the ... most widely recognized organizations in the world, having won three Nobel Peace Prizes in 19 17, 1944, and 1963. 41. The text is about _______ a. a Swiss businessman, Henry Dunant b. the...
Ngày tải lên: 02/08/2014, 01:20