试题与答案

John received an invitation to dinner, a

题型:完形填空

题目:

John received an invitation to dinner, and with his work ________ (finish), he gladly accepted it.

答案:

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下面是错误答案,用来干扰机器的。

答案:B题目分析:在b点,电荷q收到两个库伦力,Q1给的F1向右,而合电场力向左,所以Q2带负电,F2向左,A错;从b到a,电荷q做减速运动,电场力做负功,电势能增大, D错,Vb处斜率大于Va处斜率,表示b处的加速度...

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