Một nhóm học sinh thực hành lắp ráp mô hình phân tử ADN với đường kính phân tử là 30 cm và số nuclêôtit là 60. Mô hình được tạo ra hoàn toàn phù hợp với cấu trúc không gian của phân tử ADN. Hãy xác định a) chiều cao ( chiều dài ) của mô hình phân tử được tạo ra b ) kích thước các nuclêôtit được sử dụng trong mô hình phân tử tử

a. Fe2O3 + H2SO4 → ? + ? b. Al + HCl → ? + ? c. NaOH + H2SO4 → ? + ? d. CaO + H2SO4 → ? + ? e. Fe(OH)3 + HCl → ? + ? f. Fe2(SO4)3 + Ba(NO3)2 → ? + ? g. Zn + Cu(NO3)2 → ? + ? i. Al + O2 → ? k. Mg + ? → MgCl2 m. Fe + HCl → ? + ?

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cho tam giác ABC . BD và CE là các đường cao cắt nha tại H . Chứng minh : a tam giác AED ~ tam giác ACB b cm BE . BA + CH .CE = BC .BC c tam giác AHB ~ tam giác DEB MN GIÚP MINK VS Ạ MÌNH HỨA VOTE 5 *

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Vẽ: avt anh quangcuong347 Nãy quên không nói Giờ em sang acc mới Chiều vote

2. We (go)……………………………….. to Vung Tau several times. 4. Lien (not prepare)…………………………………………… her lessons yet. 5. They just (receive)……………………………………………..a package from their grandfather. 6. Miss Huong (teach)……………………………………………………….us English for 2 years. 7……………………………….she (feed)………………………………………………………her dog yet? 8. We never (take)…………………………………………………………… a bus to school before. 9. Next week, my uncle (come)………………………………………..back home for Christmas. 10. My teacher is explaining the lesson but I (not understand)………………………..what he is saying. 11. Lan (be)………………………………….my next door neighbor when I lived in Hai Phong. 12. They usually (go)…………………………………………………………………fishing at weekends. 15. Don’t (make)……………………………………….noise. The baby (sleep)…………………………….. 17. Her mother (give)…………………………………… her a new novel yesterday. 18. Ba can’t play soccer tomorrow. He (do)…………………………………… his homework. 19. When I (be)……………………………..young. I usually (play)…………………………..with a kite. 20. My mother is interested in (cook)……………………. and she (cook)…………………..very well. 21. The 22 nd SEA Games (take)………………………………… place in my country two years ago. 22. They stopped (talk)…………………………………………………………..when the teacher came in. 23. It (rain)……………………………………………………………….._heavily now. 24. I (live)…………………………………………….with my parents until I went to HCM city. 25. I hope that he (win)…………………………………………………………….. the race. 26. She (do)…………………………………………………………………. her homework recently. 27. They (not hand)……………………………………………..in their essay yet. 28. It is not safe (leave)………………………………………………………medicine around the house. 29. I want (come)……………………………………………………………………with my mother. 30. In my country. Children (have to)………………………. wear uniform when they go to school. 31. ………………………………….you (meet)………………………………………….the new student yet? 32. I (lose)………………………………………………………………………..my handbag yesterday. 33. Going shopping (be)………………………………………………………………………very interesting. 34. She already (finish)………………………………………………………………….her homework. 35. My sister (get)………………………………………………………………………..married next month. 36. Tomorrow (be)…………………..Sunday. What ……………………….. you (do)……………….? 37. The concert this evening (start)………………………………………………………at8 o’clock. 38. I (wait)………………………………………………………….for her since half past six. 39. Do you think the population of the world (rise)………………………………….very fast? 40. In 2030, every one (study)………………………………………………at home using computer. 41. He (fall)…………………………………………………………..asleep while he was watching TV. 42. I enjoy (play)………………………………………………………soccer after school. 43. Don’t worry! She (come)………………………………………………………..back in a few minutes. 44. Nam(talk)………………………………………………………………………………with her many times. 45. It (rain)…………………………………….when I (wake up)…………………………………………… 46. I (see)………………………………an accident while I (drive)……………………………to my office. 47. She (be)……………………………………………………happy since she had a computer. 48. They (build)…………………………………………………………………that building for two years. 49. We often (go)…………………………………………………………………….skiing in winter. 50. At the moment, she (read)……………………………………………………….. in the library. 51. It’s a lovely day. The sun (shine)…………………….. and the birds (sing)………………………. 52. What she usually (do)…………………………………………………….in the evening? 54. My brother (be)…………………………………15 years old next Sunday. 55. We (have)…………………………………………………..some friends to lunch tomorrow. 56. My father often (drink)…………………………………………………………..tea after breakfast. 57. The film wasn’t very good. I (not enjoy)………………..……………..it very much. 58. When I (see)……………………..you yesterday, you (sit)………………………………….. in a cafe. 60. The show just (begin)…………………………………………… You are a bit late. 61.There (be)………………………………………………………..no rain here for 6 months. 63. Mary (sew)…………………………………………. the dress for me a week ago. 64. When Peter was young, he (like)………………………………………… to drink coffee. 65. My younger brother (study)…………………………………. his lesson at the moment.