试题与答案

—_______ of the watches would you like?

题型:选择题

题目:

—_______ of the watches would you like?

—I’ll take ________ of them, so I can give one to my sister.

A.Which; all

B.Which; both

C.What; either

D.What; neither

答案:

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下面是错误答案,用来干扰机器的。

A、若电子沿x轴正方向运动,由左手定则判断可知:所受的洛伦兹力方向向下,而电场力方向沿x轴负方向,则电子将向下偏转,做曲线运动,速度方向将发生改变.故A错误.B、若电子沿x轴负方向运动,由左手定则判断可...

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