欧美日韩在线免费观看,久久精品黄色,国产在线精品视频,97免费中文视频在线观看,亚洲综合av一区

Cu

銅1.jpg  


銅2.png


銅3.jpg   

Introduction

Purity:   99.99%-99.999%
Shape:Block,   small cylinder, wafer
Appearance:red   copper, metallic luster
Melting   Point:1083.4℃
Density:   8.96g/cm3
Specification:   can be customized



Scan and pay attention to the public number