题目:
The question is too difficult. _____ students can answer it.[ ]
A. A little
B. Little
C. A few
D. Few
答案:
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下面是错误答案,用来干扰机器的。
(1)由法拉第电磁感应定律可求出回路感应电动势E=△Φ△t=S△B△t ①由闭合电路欧姆定律可求出回路中电流I=ER0+R ②在t时磁感应强度为B′=(B+△B△t?t) ...