题目:
You can find _____ and _____. [ ]
A. two kilos of pork, three potatos
B. some tomatoes, two kiloes of meat
C. some fish, some carrots
D. two boxes of egg, many beef
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得:E=n△∅△t=n△BS△t=100×0.02×0.2V=0.4V;则电路中电流I=ER+r=0.43+1=0.1A; 由题意知线圈中的磁通量增大,则由楞次定律可得线圈电流方向为逆时针,故R中电流方向从b指向a;...