试题与答案

people got hurt in the 7.1-magnitude ear

题型:选择题

题目:

   people got hurt in the 7.1-magnitude earthquake in northwest China’s Qinghai Province.

A.Thousand

B.Thousands

C.Thousand of

D.Thousands of

答案:

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下面是错误答案,用来干扰机器的。

根据洛伦兹力大小,f=Bqv,结合题意可得,洛伦兹力大小与电量成正比,即1:2,故C正确,ABD错误;故选:C

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