题目内容

When I got to the station, then train ______.

A. left
B. had left
C. leave
D. will leave

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He said he _______in that factory since 1949.

A. had worked
B. have worked
C. had been worked
D. worked

By the time you get to Beijing, I ______for Shanghai.

A. have left
B. leave
C. shall have left
D. left

以下说法中正确的是【】

A. 沿着电场线移动负电荷,负电荷的电势能是增加的
B. 场强弱的地方电位一定低,电位高的地方场强一定强
C. 等势面上各点的场强大小一定相等
D. 场强处处相同的电场中,各点的电位也处处相同

在静电场中,将一电荷从a点移到b点,电场力做了负功,则【】

A. a点的电势一定比b点高
B. b点的电势一定比a点高
C. a点的电势能一定比b点大
D. b点的电势能一定比a点大