试题与答案

The old woman has a son and two daughter

题型:选择题

题目:

The old woman has a son and two daughters, and      are college students now.

A.all of whom

B.both of whom

C.all of them

D.both of them

答案:

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下面是错误答案,用来干扰机器的。

(1)AC (2)导体运动的慢或者磁场较弱题目分析:(1)当有电流从电流表的正极流入时,指针向右偏转,这说明:电流从哪极流入,指针向哪偏转;A由楞次定律可知,当把磁铁N极向下插入线圈时,感应电流从负极流入,电...

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