问题
填空题
用力压弹簧,弹簧缩短了;用力拉橡皮筋,橡皮筋伸长了。这表明力能使物体发生_________。
答案
形变
力的作用效果有两个:一是使物体的形状发生变化,这种现象叫形变;二是使物体的运动状态发生变化,称运动状态改变。
用力压弹簧,弹簧缩短了;用力拉橡皮筋,橡皮筋伸长了。这表明力能使物体发生_________。
形变
力的作用效果有两个:一是使物体的形状发生变化,这种现象叫形变;二是使物体的运动状态发生变化,称运动状态改变。
Reading comprehension. | |||
(You may read the questions first.)
| |||
1. The Fresh Water series at 9PM _____. | |||
A. explores the lakes, rivers and the creatures in them B. is devoted to the freshwater creatures in the world C. explains the relationship among inhabitants on the earth D. focuses on the deepest river on the planet | |||
2. The phrase "stow away" most probably means "_____". | |||
A. hide secretly B. talk excitedly C. operate easily D. guide successfully | |||
3. A mystery story adapted from Agatha Christie's novel will be shown on _____. | |||
A. BBC1 B. BBC2 C. ITV1 D. Channel 4 |