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 vapor laser铜汽化激光器copper-beryllium铍铜合金,镀铜合金copper brittleness铜脆copper ore deposit铜矿床copper waste liquid含铜蚀刻废液copper electrolysis铜电解copper base bearing铜基合金轴承copper spark method铜火花法copper-to-glass铜玻璃封接copper silver alloy铜银合金