在粗糙的水平面上，有一质量为m的物体受到一个水平方向的恒力F作

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问题多选题

在粗糙的水平面上，有一质量为m的物体受到一个水平方向的恒力F作用而运动，在运动中物体的加速度a 的大小[ ]

A．与物体运动的速度无关

B．与物体运动的位移无关

C．与物体运动的时间无关

D．与恒力F成正比

答案

ABC

填空题

根据句意和提示，完成下列句子。

1. He was _________ (吸引) by her charm.

2. Mr. Li is one of the _________ (受害者) in the robbery.

3. My grandfather has been ________ (死亡) for ten years.

4. How did she _______ (成功) in the end?

5. Can you _____ (想象) what life will be like by 2100 on Earth ?

6. A police told him that a jewellery shop had been ______ (rob) .

7. He was charged with _______ ( break) into several computer systems over the last year.

8. Can you offer me some ________ (advice)? They would be the most valuable.

9. Mrs. Li told me that she _______ (finish) the work already.

10.The old woman passed away _________ (peace) in her nineties .

单项选择题

采用滚杠法拖运设备时，其拖拉力的大小与拖排下放置的（）和下走道的铺设宽度有一定的关系。

A、滚杠的长度

B、滚杠的数量

C、枕木

D、滚杠的直径