Ab为两个条形磁铁的两个磁极根据图所示的磁感线方�可以判断a为 极b为 极小磁针的上端为 极——青夏教育精英家教�—— Template




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tomskiab为两个条形磁铁的两个磁极根据图所示的磁感线方�可以判断a为 极b为 极小磁针的上端为 coloring