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關注：1
2013-05-23 12:21
求翻譯：a magnet that is a magnet only as long as an electric current is flowing round it is called an electro-magnet.是什么意思？ 待解決
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- 離問題結束還有
a magnet that is a magnet only as long as an electric current is flowing round it is called an electro-magnet.
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