copperingn.铜包皮
coppern.铜;铜币;警察;紫铜色;有紫铜色翅膀的小蝴蝶vt.镀铜
copper electrolytic refinery铜电解精炼厂
copper dish evaporation test铜皿胶质试验
copper arc welding electrode铜焊条
copper saving with aluminium以铝节铜
copper rod breakdown machine铜大拉机
copper-based preservatives铜基防腐剂
copper lead and zinc deposit铜-铅-锌矿