请列举并解释说明一下磁铁的用处及原理.
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![请列举并解释说明一下磁铁的用处及原理.](/uploads/image/z/3339918-54-8.jpg?t=%E8%AF%B7%E5%88%97%E4%B8%BE%E5%B9%B6%E8%A7%A3%E9%87%8A%E8%AF%B4%E6%98%8E%E4%B8%80%E4%B8%8B%E7%A3%81%E9%93%81%E7%9A%84%E7%94%A8%E5%A4%84%E5%8F%8A%E5%8E%9F%E7%90%86.)
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