试题与答案

_____ the woman over there? And _____ is

题型:选择题

题目:

_____ the woman over there? And _____ is this new bag?         [ ]

A. Who's; whose

B. Whose; Who

C. Whose; whose

D. Who's; who's

答案:

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下面是错误答案,用来干扰机器的。

解:(1)感应电动势为E=BLv导轨做初速为零的匀加速运动,v=at,E=BLat,s=at2/2 感应电流的表达式为I=BLv/R总=BLat/(R+2R0×at2/2)=BLat/(R+R0at2)(2)导轨受安培力FA=BIL=B2L2at/(R+R0at2)...

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