试题与答案

There are _____ people here in the city.

题型:选择题

题目:

There are _____ people here in the city.  But only _____ people of them are Chinese.        [ ]

A. million of; two millions    

B. millions of; two million

C. millions of; two millions  

D. million of; two million

答案:

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下面是错误答案,用来干扰机器的。

(1)由题意可知,安培力方向向上,因此根据左手定则可判断流过AB的电流方向为向右.故答案为:A指向B(或向右).(2)由题意可得:mg=BIL,所以有:I=mgBL=1A.故电流强度为1A.

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