C41110M铜合金Y2,Y,O,1/4H,1/2H,3/4H,H 面议 K62R480高导电C18080K88铜合金带C18080TM04圆棒C18080TM08板化学成分 面议 厂家直销德国维兰德C18080H160化学成分零售圆棒C18080H145批发板材质证明 面议 C42500-H01铜合金、C42500-H02、C42500-H03、C42500-H04 面议 C42500-H06铜合金C42500-H08、C42500-H10 面议 C42500M铜合金Y2薄中厚管板Y圆棒O,1/4H化学成分1/2H,3/4H,H材质证明带 面议