magnet
回答 (1)
2006-11-18 8:20 am
✔ 最佳答案
first of all, all things in the world are combined by element.magnet is a solid which can creat a magnetic field by itself.
in fact, magnet is formed by some transition metals, for example iron .
收錄日期: 2021-04-12 21:52:39
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https://hk.answers.yahoo.com/question/index?qid=20061118000051KK00005