黄铜是铜锌合金。Brass is an alloy of copper and zinc.铜锌合金叫做替代式合金.Copper - zinc alloys are called substitutional alloys.材料: 采用高强度结构或锌合金压铸或不锈钢制成.Material: Strengthened structure or zinc alloy die - casting or stainless steel....
涓滴细流汇沧海.Little drop of water make the mighty ocean.[谚]涓滴之水汇成洋.Little drops of water make the mighty ocean.涓滴之水汇成海; 一石一石筑成墙.Drop by drop the ocean is filled; stone by stone the wall is build....