Có một ống bê tông rớt xuống mương(hình vẽ) 1.Nếu bạn học sinh kéo trực tiếp lên(chỉ dùng dây buộc)thì có những khó khăn nào? 2.Em hãy nghỉ cách dùng các máy cơ đơn giản thích hợp.Vẽ hình minh họa và chỉ rõ mỗi loại máy cơ đơn giản trong hình vẽ có tác dụng gì trong công việc trên.

Các câu hỏi liên quan

VII. Rearrange the words to make meaningful sentences live / on / in / not / aunt / does / small / Hung Vuong Street / house / a/ my. …………………………………………………………………………..…………………… these / notebooks / their / new / are ? …………………………………………………………..…………………………………… there / wall / picture / is / in / a / your / the / on / living-room? …………………………………………………………………………..…………………… city / it / in / is / house / house / a / the / is / big / Lan’s / and. ……………………………………………………………………………...………………... years / a / Mrs. Nga/ teacher / and / thirty-two / old / she / is / is. …………………………………………………………………..…………………………… VI. Change these sentences in the plural 1. What’s this ? It’s a bench.………… ……………………………………………………….. 2. Is that her knife? …………………………………………………………………….. 3. This woman has a child. …………………………………………………………………….. 4. The policeman is in his room.………………… ………………………………………………….. 5. Does he has a white tooth? ………………………………………………………. VII. Make questions for the undrelined words 1. Mai is not very well today.....................................................................................? 2. The man in the car is our new teacher.............................................................................? 3. There is a board on the wall.............................................................................................? 4. My sister lives on Le Qui Don Street.........................................................................? 5. No. She is a nurse............................................................................................? 6. My brother gets up at a quarter to six.......................................................................................? 7. Her mother is a teacher..............................................................................................? 8. There is a lamp by the telephone............................................................................? 9. Nam goes to school with his friends.………………………… …………………………? 10. Tuan does his homework in the evening.………………………………………..……………….?