供应优质【QCr0.5-0.2-0.1 】铬青铜棒
C1100纯铜C1100纯铜..
TP1材料TP1磷脱氧铜棒T..
TU1-TU1无氧铜棒TU1..
供应优质【QCr0.5-0...
供应T2纯铜板T2纯铜板厂家..
供应优质C1020纯铜管C1..