Cov yam ntxwv ib puag ncig: lub tshuab vuam yuav tsum muab tso rau hauv qhov chaw qhuav thiab qhov cua kom tsis txhob muaj roj corrosive lossis kua.
Txawm hais tias sab hauv ntawm lub tshuab vuam yog raug rau cov dej-pov thawj, plua plav-pov thawj thiab kev kho zoo li qub,
nws tseem yuav tsum tau dedusted tsis tu ncua tom qab siv ntev. Tshwj xeeb tshaj yog nyob rau hauv ib puag ncig hnyav, nws yog qhov zoo dua rau dedust ib hlis ib zaug.





