Kev ntsuam xyuas huab cua kub laus ntawm cov roj hmab compound yog nqa tawm raws li cov cai ntawm GB / T3512.
Cov kua qaub thiab alkali tsis kam kuaj ntawm cov roj hmab compound yog nqa tawm raws li cov cai ntawm GB / T1690.
Nov 18, 2019
Kev sim
Koj Tseem Yuav Zoo Li
Xa lus