问题
填空题
用如图所示的滑轮组提起重物，不计动滑轮自重和摩擦，若拉力F为50N，则重物G为_________ N，若绳子的自由端向上拉0.6m，则重物升高___________m。
答案
150；0.2
搜题请搜索小程序“爱下问搜题”
用如图所示的滑轮组提起重物，不计动滑轮自重和摩擦，若拉力F为50N，则重物G为_________ N，若绳子的自由端向上拉0.6m，则重物升高___________m。
150；0.2
| 选词填空（用适当形式）。 | |
2. To make sure that he was at home, I ____ him ____ in advance. 3. Just___ with it, and you will succeed. 4. The whole things were ____ , and mother was angry. 5. ____ solving the problem now. 6. She____the water and came up coughing. 7. The shepherd____to look for the sheep that had wandered away. 8. He was very angry and____before I finished my sentence. 9. He was very busy then and promised to ____ later. 10.____ ,he would visit me in the countryside. |