为什么磁铁只能吸住两个平行叠加的硬币?第一个吸力最大,第二个减半,第三个直接就吸不上了? 知乎 Template




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tomski为什么磁铁只能吸住两个平行叠加的硬币?第一个吸力最大,第二个减半,第三个直接就吸不上了? 知乎 coloring