中国的铜循环
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The "Copper-flow analysis with time factor of the life cycle of copper products" method was expatiated, and the flows of copper in China were analyzed by using this method.
前言：介绍了“具有时间概念的铜产品生命周期铜流分析方法”，并运用这种方法分析了我国铜的流动状况。
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