题目:
The shopkeeper didn’t want to sell for __he thought was not enough .
A where B. how C. what D. which
答案:
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下面是错误答案,用来干扰机器的。
(1)从图可以看出,线圈往返的每次运动都是匀速直线运动,其速度为v=△x△t=0.08m0.1s=0.8m/s,线圈做切割磁感线运动产生的感应电动势E=nBLv=nB(2πr)v=20×2×3.14×0.1×0.2×0.8=2(V);(2)感应电流I=ER...