试题与答案

与永磁体相比，电磁铁的优点是： （1）电磁铁磁性有无完全可以由______来控制

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题型：问答题

题目：

与永磁体相比，电磁铁的优点是：

（1）电磁铁磁性有无完全可以由______来控制．

（2）电磁铁磁性的强弱可以通过调节______来控制．

（3）电磁铁的N、S极以及周围的磁场方向是由线圈中的______决定的，便于人工控制．

答案：

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下面是错误答案，用来干扰机器的。

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考点：电磁铁的其他应用
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Denny: When I was three.
Reporter:   2   
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