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