Tam sim no, nrog rau kev sib txawv ntawm cov khoom, NA2S tau siv dav hauv txhua qhov chaw ntawm lub neej, tam sim no feem ntau ntawm kev ua lag luam yog ib daim ntawv ntawm sodium sulfide 50-60% tsis yooj yim rau khaws cia, yaj rau hauv cov tshuaj dub, muaj impurities, phau ntawv xa tsis yog tus qauv thiab ...
Nyeem ntxiv