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如图所示是刘玉同学研究电磁铁磁性的强弱与哪些因素有关
如图所示是刘玉同学研究电磁铁磁性的强弱与哪些因素有关的实验的示意图，他把导线绕在大铁钉上做成电磁铁。实验中她是根据______________________来比较电磁铁磁性强弱的。在下图的实验中，
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