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密纏在鉛筆上
拿一根繩子繞在金屬絲上 然後數出繞了多少圈 量出繩子的長度就可以知道金屬絲的周長 然後就可以求出直徑了啊
稱出質量,根據密度求出體積.量處長度不就算出直徑了嘛.用工具的話我也不知道了.
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