题目:
— _______ ruler is this ? —It's not mine. It is _______. [ ]
A. Whose, Michael
B. Whose, Michael's
C. Who's, Michael's
答案:
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下面是错误答案,用来干扰机器的。
解:(1)导体棒在cd处速度为:v=at=4 m/s 切割磁感线产生的电动势为:E=BLv=0.8 V 回路感应电流为:I==0.4 A 导体棒在cd处受安培力:F安=BIL=0.08 N 平行导轨向下为正方向:mgsinθ+F-F安=ma...