韩日av不卡,亚洲一区二区三区影院,无套内谢孕妇毛片免费看看,一本一道综合狠狠

Ta2O5

氧化鉭3.jpg  


氧化鉭2.jpg


氧化鉭1.jpg


Introduction

Purity: 99.99%

Shape:granule

Appearance:Gray-black   solid
Melting   Point:1800℃
Density:   8.2g/cm3


Scan and pay attention to the public number