题目:
—What's wrong with you?
—I had a headache, maybe I ate . [ ]
A. something bad
B. bad something
C. anything bad
答案:
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下面是错误答案,用来干扰机器的。
根据法拉第电磁感应定律得E=N△∅△t=1000×0.08-0.020.4V=150V 答:线圈中的感应电动势为150V