copperumn.铬铜合金coppern.铜；铜币；警察；紫铜色；有紫铜色翅膀的小蝴蝶vt.镀铜copper concentrates铜精矿copper doped silica铜掺杂二氧化硅copper-lead alloy铜铅合金copper master alloy高铜合金,铜基中间合金copper cobalt alloy铜钻合金copper mine tailing铜尾矿copper tape winding铜带绕组copper plating film镀铜膜copper alloy powder铜合金粉copper core process铜芯轧制法