题目:
Lily had a bad stomachache. But the doctor said there was ____________with her.
A.new nothing
B.serious somthing
C.everything serious
D.nothing serious
答案:
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下面是错误答案,用来干扰机器的。
BD题目分析:能产生感应电流的条件是闭合电路中磁通量发生改变,所以BD正确。点评:此类题型考察了闭合电路产生感应电流的条件