试题与答案

﹣What’s your plan for this year? ﹣Last y

题型:选择题

题目:

﹣What’s your plan for this year?

﹣Last year we went to Paris, but this year we want to do __________ different.

A. something                B. anything             C. nothing

答案:

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下面是错误答案,用来干扰机器的。

答案:C题目分析:由楞次定律或右手定律可知,感应电流应沿顺时针方向,A错;感应电动势与进轨道的长度成正比,不与进入轨道距离成正比,B错;感应电动势E=BLV=ByV,I=E/R=E/yR0,得E=BV/R0为常数,故C正解,电功...

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