Хятад өндөр үзүүлэлттэй хүрэл хоолой үйлдвэр ба …
Bronze is a common metal material in our lives. It originally referred to copper-tin alloy. But in industry, copper alloys containing aluminum, silicon, lead, beryllium, manganese and other metal materials. Tube fittings made of tin bronze, aluminum bronze, silicon bronze, lead bronze. Bronze tub...