A磁铁的正极吸引b磁铁的负极，为什么不会因为排斥b磁铁的正极而不吸引b磁铁？ 知乎 Sketch Coloring Page

A磁铁的正极吸引b磁铁的负极，为什么不会因为排斥b磁铁的正极而不吸引b磁铁？ 知乎 Template

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