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How can we tell whether the copper is good or bad?

Source：本站   Time：2015/06/17  

铜主要看他的色泽，紫铜，红铜是好铜。还有黄铜，颜色发浅。还有的铜上镀了一锌，有的镀锡，发白色，还有一种劣质铜，铜里面有杂质，用手一弯就断成两截，里面有黑色杂质

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