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 base firction material铜基合金摩擦材料Copper Retreat Into The Light光进铜退Copper pipe with aluminum fin铜管串翅片copper-strip ping autoclave脱铜高压釜copper base friction material铜基合金摩擦材料copper-graphite composition铜-石墨制品copper strip corrosion tester铜条腐蚀测试仪copper insoluble metal powder不溶于铜的金属粉末copper cladding aluminum wire铜包铝线材copper combined with aluminum铜铝复合