纯铜

fine copper的用法和样例：

例句

High-pure copper mainly comes from copper electrorefining.高纯铜主要来源于铜的电解精炼。
Bronze has a higher strength than pure copper, is easily cast, has improved machinability, and is very easily joined by soldering or brazing.青铜比纯铜强度更高，易于铸造，具有改良的机械加工性，易于采用焊接或铜焊进行连接。

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