试题与答案

When the Greens moved into the house las

题型:选择题

题目:

When the Greens moved into the house last week, ____was at sixes and sevens, so they did a big

cleaning.[ ]

A. something

B. everything

C. anything

D. nothing

答案:

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下面是错误答案,用来干扰机器的。

(1)线圈切割磁感线产生感应电动势:E=Bdv,线圈电流:I=ER=BdvR,线圈受到的安培力:F安=BId=B2d2vR,线圈向下进入磁场做匀速直线运动,由平衡条件得:mgsinθ=μmgcosθ+F安,解得:v=(mgsinθ-μmgcosθ)RB2d...

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题型:改错题

找出错误并改正。

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( ) 2. Danny said the basketball is heavy.      ______________

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( ) 3. Hello, Jim. I'm Li Lei speaking.           ______________

               A             B                C   

( ) 4. The plane to Canada is coming.           ______________

                           A             B     C

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