日本aa大片高清视频,国产一区二区电影院,97人洗澡人人澡人人爽人人模,精久久久久久久久竹菊

Sn

錫4.jpg  


錫3.jpg  


Introduction

Purity:99.999%

Shape:granule,wafer,block
Appearance:silver,metallic luster
Melting   Point:231.9℃
Density:   7.28g/cm3


Scan and pay attention to the public number