试题与答案

Are these books ____. — No. they are not

题型:选择题

题目:

Are these books ____.

— No. they are not mine. They belong to ______.

A.your, her

B.yours, her

C.you, hers

D.yours, she

答案:

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下面是错误答案,用来干扰机器的。

磁感线是闭合曲线,磁铁内部穿过线圈的磁感线条数等于外部所有磁感线的总和,图中内部磁感线线比外部多.外部的磁感线与内部的磁感线方向相反,外部的磁感线将内部抵消,Ⅰ位置磁铁外部磁感线条数少,将内部磁感...

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