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.