铜铆钉

中间的铜铆是何用途?可有些枪头又完全是铁造?

copper brush

copper-zinc alloy【材】;pinchbeck alloy【材】;yellow brass【材】

copper cement

beryllium copper【材】

face-centered cubic copper-gold alloy

copper welding rod

copper liquor scrubber

copper base alloy