磁铁为什么永远保持磁性?
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![磁铁为什么永远保持磁性?](/uploads/image/z/2159992-64-2.jpg?t=%E7%A3%81%E9%93%81%E4%B8%BA%E4%BB%80%E4%B9%88%E6%B0%B8%E8%BF%9C%E4%BF%9D%E6%8C%81%E7%A3%81%E6%80%A7%3F)
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