无码中文字幕色专区,天天躁日日躁狠狠躁av,亚洲成a人片777777,欧美午夜一区二区福利视频

Nb

鈮1.jpg  


鈮2.jpg  


鈮3.jpg




Introduction
Purity:99.95%
Shape:Block,   Columnar
Appearance:grey   metal
Melting   Point:2468℃
Density:   8.57g/cm3


Scan and pay attention to the public number