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铜的产量趋势 据美国金属统计局发展的世界有色金 属资料表明,近四十年来,世界铜产量一直处于增长的趋势,现摘最近十年的统计数据列于表1。
Copper Output Trend According to the world non-ferrous metal information developed by the United States Bureau of Metrology, the output of copper in the world has been on the rise for nearly four decades. The statistics of the recent 10 years are listed in Table 1.