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Biết khối lượng của prôtôn là 1,00728 u; của nơtron là 1,00866 u; của hạt nhân 22,98373 u và lu = 931,5 MeV/c ?. a. Xác định cấu tạo của b. Tính năng lượng liên kết riêng
Trên cùng 1 nửa mặt phẳng bờ chứa tia Ox vẽ góc xOy = 55 độ , góc xOz = 110 độ . Hỏi trong 3 tia Ox , Oy , Oz tia nào nằm giữa ? Tính góc yOz ? Tìm tia phân giác .
Cho tam giác ABC, trên tia đối của AB lấy D sao cho AD=AB. Lấy G thuộc AC sao cho AG = 1/3.AC. Tia DG cắt BC tại E; qua E vẽ đường thẳng song song với BD; qua D vẽ đường thẳng song song với BC. Hai đường này cắt nhau tại F. Gọi M là giao của EF và CD a) G là trọng tâm tam giác BCD b)tam giác BED=FDE từ đó suy ra EC=DF c) chứng minh B,G,m thẳng hàng
Chia m gam hỗn hợp X gồm Al và Cu thành hai phần bằng nhau: - Cho phần một vào lượng dư dung dịch H 2 SO 4 (loãng) dư, sau khi kết thúc phản ứng, thu được 1,68 lít khí H 2 (đktc). - Cho phần hai vào lượng dư dung dịch H 2 SO 4 (đặc, nóng) dư, sau khi kết thúc phản ứng, thu được 3,36 lít khi SO 2 (đktc, sản phẩm khử duy nhất). Viết phương trình và tính m.
Hãy tìm lỗi sai trong các phần được đánh dấu A B C D trong câu. Hãy tìm lỗi sai trong các phần được đánh dấu A B C D. 1. He doesn't know how to take care for himself. 2. I'll be happy seeing you any day next week. 3. You shouldn't forget comb your hair before you go out. 4. After the dentist filled his tooth, it stopped hurt immediately. Các phần được đánh dấu A B C D CÂU 1. A: doesn't B: how to C: for D: himself CÂU 2. A: be B: seeing C: day D: next week CÂU 3. A: shouldn't B: comb C: your D: before CÂU 4. A. the B. filled C. his D. hurt
trình bày cảm nhận của em về đời sống tình cảm gia đình trong chiến tranh qua truyện ngắn Chiếc lược ngà của Nguyễn Quang Sáng
Diện tích cần sơn của căn phòng có kích thước là chiều cao là 0,5 chiều dài 4 và rộng là 3,5. Không sơn sàn)
Viết dạng đúng của từ trong ngoặc 1. Try to wait for the minutes and it'll stop......................(Hurt) 2. The nurse is kind and very ......................(Help) 3. You should brush your teeth...................( Regular ) 4.She always washes and irons her clothes...................(Careful)
nhờ hết vào các bạn nếu ai trả lời đúng minh cho câu trả lời hay nhất
1. The more you study , ______________________________ . A. the more knowledge do you gain B. you are the more knowledgeable C. the more knowledge you gain D. you will gain more knowledge 2. Winning a place at university _______________ for most students . A. is becoming more and more difficult B. has become as difficult C. will become more difficultly D. becomes the most difficultly 3. John said that no other car could go _________________ . A. as fast as his car B. faster like his car C. fastest than his car D. so fast like his car 4. The younger you are , ________________ it is to learn . A. easier B. you are easier C. the easier D. the easy 5. Commercial centers are _____________ they were many years ago . A. as popular than B. the most popular C. more popular than D. most popular than 6. The rooms in the front ________________ noisier than those in the back . A. are more B. are littler C. are very D. are much 7. This one is prettier , but it costs _________________ as that one . A. as much as B. twice as much C. as many D. twice as many 8. The ___________ he is , the more miserable he gets . A. richer B. more riches C. more rich D. none is correct 9. I’ll be here _____________ I can . A. sooner as B. no sooner as C. as soon as D. soonest as 10. Computers are considered as __________ tools today . A. modern as B. the most modern C. much modern than D. more modern 11. As we continued traveling north , the weather got _______________ Eventually , everything we saw was frozen . A. cold more B. more cold C. colder and colder D. the colder 12. _____________ electricity you use , ____________ your bill will be . A. More / higher B. The most / the higher C. The more/the high D. The more/the higher 13. My English in this term is ___________ than that of last year. A. good B. the best C. better D. best 14. Her math result is __________ than her English result. A. bad B. badly C. worse D. well 15. Detective books are __________ than science fiction ones. A. interesting B. interestingly C. most interesting D. more interesting 16. Peter is the _______ student in my class. A. taller than B. so tall as C. the tallest D. tallest 17. Jane is not _______ her brother. A. so intelligent as B. intelligent as C. more intelligent as D. so intelligent that 18. He drives as _______ his father does. A. careful as B. more carefully C. the most careful D. carefully as 19. Jane is _______ age as Mary. A. as same B. the most same C. the same D. more same 20. The _______ we start, the sooner we will be back. A. early B. earliest C. earlier D. more early 21. The sooner, the _______ A. better B. best C. good D. more good 22. My new glasses cost me _______ the last pair that I bought. A. as much three time as B. three times as much as C. three times more than D. times three 23. Ms. Jones isn’t as nice _______ Mr. Smith. A. as B. for C. like D. to 24.The more we learn, ________ A. we become wise B. the wiser we become C. wiser we become D. we become wiser 25.Your English is improving considerably. It is getting________. A good and well B better and better C good and better D more good and well 26. If you practise harder you will have better results . A. The harder you practise , the better results you will have. B. The more hardly you practice , the better results you will have. C. The hardest you practise , the most results you will have. D. The harder you practise , the best results you will have. 27. I learn a lot but I cannot remember anything. A. I learn more and more and remember more and more. B. The less I learn, the more I remember. C. The more I learn, the less I remember. D. I remember not only what I have learnt. 28._______ you study for these exams, _______ you will do. A. The harder / the better B. The more / the much C. The hardest / the best D. The more hard / the more good 29._______ he drank, _______ he became. A. More / more violent B. The most / the most violent C. The more / the more violent D. The less / less violent 30. ______ , the better the service is . A. The better expensive the hotel is B. The worse expensive the hotel is C. The more expensive the hotel is D. The most expensive the hotel is
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