Nêu ứng dụng của SO2 ( 5 ứng dụng ) viết pt điều chế SO2 trong thí nghiệm và công nghiệp

6.11: Chứng minh rằng nếu 2 tia Ox và Oy thuộc 2 nửa mặt phẳng đối nhau bờ chứa tia Oz sao cho thì 2 tia Ox, Oy đối nhau

6.10: Chứng minh định lí: Trên tia Ox có OM=a, ON=b. Nếu a<b thì điểm M nằm giữa 2 điểm O và N.

mình cần siêu gấp ậ cực kì gấp ạ thankss all mình hỏi từ buổi chiều tới bây h vẫn chx có ai trả lời =((((((((((((

13. They are going to eat some fruit. Some 14. We didn’t use to play golf. Golf 15. Hoa is writing a letter to her pen pal. A 16. Long is feeding his pet animals. His 17. Laura is taking her children to Disneyland. Her 18. He was cooking a special meal for his wife’s birthday. A special 19. They were teaching the boy how to solve difficult math problems. The boy 20. His father was drawing a new picture of his neighborhood. A new 21. I first listened to country music in 2000. I have 22. She began to do her homework at 2 o’clock. She has 23. Binh started to feed his dogs a year ago. Binh has 24. Nam began learning Malay when he came back from Malaysia. Nam has 25. Mr. Hưng started building the two bridges last month. Mr. Hưng has 26. Did you first live in this house last year? Have 27. Did they start to grow rice on the mountain when they decided to live there? Have 28. Did Victor Vũ begin to make films in Vietnam ten years ago? Has 29. Did she start singing for money yesterday? Has 30. Did he begin teaching at university in 2014? Has 31. When did we first collect ancient coins? How long How long ago How long is 32. When did Daisy begin catching fish with her bare hands? How long How long ago How long is 33. When did Nam start to do karate? How long How long ago How long is 34. How long have you taken up badminton? When 35. How long is it since Miss Lam lived on her farm? When 36. The last time Lan wrote a letter to Mai was six months ago. Lan hasn’t Lan last 37. The last time we drank coffee was last week. We haven’t We last 38. They haven’t come to visit him for five years. The last They last 39. She hasn’t cleaned her room since she was sick. The last She last 40. He last read a comic in 2005. He hasn’t The last 41. It’s ten years since he last played the guitar. He 42. It’s two weeks since we last met each other. We 43. They haven’t told jokes to the children for a month. It’s 44. Hoa hasn’t taken an exam for four years. It’s 45. This is the first time I have known what a credit card is. I 46. This is the first time the baby has seen an elephant. The baby 47. She has never eaten vegetarian food before. This 48. The children have never enjoyed swimming in a water park before. This 49. Tom began to play basketball when he entered university. Basketball has 50. The last time Minh gave his friends his old books was when he moved to Củ Chi. His friends haven’t 51. It’s three months since Ba last rode his bike. His bike

Cho số hữu tỉ x=a-3/3a(a khác 0). Với giá trị nào của a thì x là số nguyên

6.9: Qua điểm O nằm ngoài đường thẳng a vẽ một số đường thẳng không phải tất cả đều cắt a. Những đường thẳng cắt a được 78 tam giác chung đỉnh O. Chứng minh rằng trong các đường thẳng đã vẽ qua O cũng có 2 đường thẳng cắt nhau theo một góc nhỏ hơn

1.A . pasture B. vast C. brave D. farm 2. A. cattle B. circurlar C. country D. collect 3. A. crowed B. watched C. worked D. relaxed

Làm ơn giúp mình vs mình đag cần gấp

I. Choose a word in each line that has different stress pattern. 1. A. bamboo B. village C. workshop D. famous 2. A. business B. chocolate C. grandparent D. experience 3. A. communicate B. generation C. historical D. environment 4. A. handicraft B. department C. embroider D. opinion 5. A. transfer B. accept C. publish D. remind II. Choose the best one (A, B, C or D) to complete the sentence. 1. Every house in the street has been demolished. A. exploded B. turn up C. removed D. turn down 2. In 1990, due to the change of the economic situation, many Dong Ho cooperatives had to . A. close down B. shut C. close D. close in 3. Craftsmen have to the domestic and international markets so that they needn’t depend on the middlemen for their sales. A. find out B. find out about C. find D. find about 4. She her husband’s job for his ill health. A. accused B. blamed C. caused D. claimed 5. Making rice paper jobs and income for many locals, help many families out of poverty and become well-off. A applies for B. creates C. keeps D. gets 6. This ring is only made of plastic so it’s quite . A. valuable B. invaluable C. worthless D. priceless 7. Craft village are becoming popular in Viet Nam. A. tour attractiveness B. physical attraction C. tourism attractions D. tourist attraction 8. He got an excellent grade in his examination the fact that he had not worked particularly hard. A. on account of B. because C. in spite of D. although 9. The artisan is delighted to to you the craft of creating prints in an old-age style. A. express B. provide C. demonstrate D. explain 10. The government has recently the building in the old section of the city. A. reformed B. adjusted C. restored D. modified 11. The traditional craft has from generation to generation. A. been passed down B. been passed by C. passed down D. passed 12. In order to buy his house, he had to obtain a large from his bank. A. loan B. finance C. capital D. debt 13. The bronze casting craft in Viet Nam dated back from the age of King An Duong Vuong ancient bronze arrowheads were made. A. so B. when C. because D. although 14. In the past, local were chosen to make sophisticated embroidered costumes for the Vietnamese King, Queen and other Royal family members. A. skillful artists B. skilled artisans C. skill workers D. skillfully works