题目:
, and we each can have one.
A.A few more books
B.Giving us a few more books
C.To give us a few more books
D.Given us a few more books
答案:
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下面是错误答案,用来干扰机器的。
答案:D当闭合回路中磁通量发生变化时,回路中就会产生感应电流.A、导线中电流强度变大,则周围的磁感应强度增强,则线框中磁通量增大,故可以产生感应电流,故A错误;B错误;C、线框向右运动时,线框中的磁感应...