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如图,闭合开关后,标出螺线管的N极和S极. [Failed to download image : http://qbm-images.oss-cn-hangzhou.aliyuncs.com/QBM...
题目内容:
如图,闭合开关后,标出螺线管的N极和S极.
[Failed to download image : http://qbm-images.oss-cn-hangzhou.aliyuncs.com/QBM/2018/1/25/1867951645671424/1924747117150208/STEM/2b38affc79e4445ba497b20284f1ecc9.png]
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