欧美a级黄片,中文字幕精品久久久久人妻红杏1,福利久久,亚洲AV无码片一区二区三区_

產(chǎn)品名稱：碳化鎢粉               
粒度：2.52μm                      
化學(xué)成分（%）                    
Ct....6.12         Cf....0.02                   
Cc....6.1           O.....0.039                      
As....0.0005     Si.....0.0005              
Al.....0.0005     Sb....0.0005               
Pb....0.0001     Mg...0.0005                 
Sn....0.0001     Mn...0.0005                
Ni.....0.0005     Cr....0.0005                  
Co....0.0021     Bi.....0.0001                   
Ti......0.0005     Ca....0.0005