下列关系式中正确的是（） A．1J/C=1V B．1C/V=1J C．1V/C

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问题多选题

下列关系式中正确的是（　　）

A．1J/C=1V

B．1C/V=1J

C．1V/C=1J

D．1V/m=1N/C

答案

A、根据电势差与电场力做功的关得U=

，

功的单位是J，电量的单位是C，所以1J/C=1V，故A正确，BC错误

D、根据电场强度的定义式得E=

根据匀强电场电场强度与电势差的关系得E=

，

所以1V/m=1N/C，故D正确

故选AD．

句型转换

同义句转换。

1. She likes the book that was written by Lu Xun.

She likes the book__________ __________ Lu Xun.

2. She decided that she won't go alone.

She decided __________ _________ go alone.

3. Surfing the Internet can provide us with the latest news.

Surfing the Internet can ______ the latest news ______ us.

4. It took some students too much time to play computer games.

Some students ______ too much time ______ computer games.

5. People don't feel like doing simple jobs over and over again.

People __________ ____________ not to do simple jobs over and over again.

单项选择题

采煤机牵引部的液压系统采用（）。

A.机械油

B.普通液压油

C.抗磨液压油