...secondary copper; copper content estimation; sample selection; color vector angle; least squares[gap=43482]关键词：再生铜；铜含量估计；样本筛选；颜色向量角；最小二乘支持向量回归 ..
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... reckoning in every item of income or expenditure ==> 满打满算 reclaimed copper ==> 再生铜 reclaimed oil ==> 再生油 ...
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铜再生 copper regeneration ; recovering copper
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