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问题 不定项选择

平行板电容器两极板与静电计金属球和外壳分别连接，对电容器充电，使静电计指针张开某一角度，撤去电源后以下说法正确的是

[ ]

A. 增大两板间距离，静电计指针张开角度变大

B. 减少两板间距离，静电计指针张开角度变大

C. 将两板平行错开一些，静电计指针张开角度变大

D. 将某电介质插入两板间，静电计指针张开角度将变大

答案

AC

阅读理解

阅读短文，选择正确答案。

    This is Jim's bedroom. We can see a bed in it. There is a doll on the bed. We can see a desk beside the

bed. There are some pencils on it. The windows are above the desk. The walls are white and the windows are green. We can see a map and a picture on the wall. rrhe bedroom is small. But it's very nice. Jim likes

it very much.

1. Where is the doll?

A. On the desk.    

B. On the bed.

C. Under the desk.

2. What's on the desk?   

A. Some books.    

B. Some pencils.

C. Some markers

3. What colour are the windows?

A. They are white.    

B. They are green.

C. They are blue.

4. How many pictures are there on the wall?

A. One.    

B. Two.    

C. Three.

5. Does Jim like his bedroom?

A. Yes, he likes it very much.    

B. No, he doesn't.

C. I don't know.
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不定项选择

一质点做匀加速直线运动，第三秒内的位移2m，第四秒内的位移是2.5m，那么可以知道 [ ]

A．这两秒内平均速度是2.5m／s

B．第三秒末即时速度是2.25m／s

C．质点的加速度是0.125m／s2

D．质点的加速度是0.5m／s2
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