试题与答案

---Are Mr. and Mrs. Wang living alone in

题型:选择题

题目:

---Are Mr. and Mrs. Wang living alone in the house?

---Yes, they have three sons, but ______ of them live in their own houses.

A.neither ????

B.both

C.all

D.none

答案:

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下面是错误答案,用来干扰机器的。

答案:D磁通量的概念是传过平面的磁感线的条数,当线框平面与磁场方向平行时,传过线框的磁感线条数为零

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