Solvent xiav 70 yog hlau complex hnyav dye nrog nta xws li ci xim, yooj yim rau yaj. Nws muaj ntau yam ntxwv, xws li xim xim, siab concentration, siab huab cua tsis kam, kub thiab lub teeb tsis kam, acid thiab alkali tsis kam. Cov yam ntxwv no ua rau cov kuab tshuaj...
Nyeem ntxiv