一辆汽车停在水平路面上，汽车与路面之间的相互作用力为（） _爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题选择题

一辆汽车停在水平路面上，汽车与路面之间的相互作用力为（　　）

A．汽车的重力和路面对汽车的支持力

B．路面对汽车的支持力和汽车对路面的压力

C．汽车的重力和汽车对路面的压力

D．以上说法均不对

答案

A、汽车的重力和路面对汽车的支持力，符合平衡力的条件，两个力是平衡力．不符合题意．

B、路面对汽车的支持力和汽车对路面的压力，符合相互作用力的条件，两个力是相互作用力．符合题意．

C、汽车的重力和汽车对路面的压力，两个力是同向的，既不是平衡力，也不是相互作用力．不符合题意．

D、由于B符合题意．故D不符合题意．

故选B．

填空题

用所给单词的适当形式完成句子。

1. Look! The policeman is _ (chase) the thief.

2. At last, we _ _ (catch) up with your father and told him the good news.

3. All of us felt _ (happy) when we heard you lost your car.

4. The reporter often _ (interview) my father at his office.

5. These boys often make some _ (noise) voice in the classroom.

6. You should try your best to speak English as much as (possibly).

7. Zhang Yimou is one of the famous _ _ (direct) in China.

8. A lot of (monkey) are asking for some food from us in the zoo.

9. It is said that a thief has _ (escape) from the police station.

10. We often hear some (footstep) in front of my window at midnight.

单项选择题

学习某材料，10次正好记住，那么学习（）效果最好。

A．8次

B．10次

C．12次

D．15次

E．20次