Ua ntej txheej txheej hmoov txheej, cov khoom yuav tsum huv kom huv si kom tshem tau cov roj los yog xeb ntawm qhov chaw. Qee cov neeg siv khoom yuav xaiv tua blasting, thiab cov neeg siv khoom feem ntau nyiam cov tshuaj pretreatment --- siv cov kua tshuaj tshem tawm cov roj los yog cov xeb me me.
Txau pretreatment tsis zoo rau txhua yam ntawm qhov chaw. Dip tank pretreatment yog kev lag luam ntau dua, thiab txhim khu kev qha rau kev ntxuav qhov chaw.
Ntawm no hauv qab no yog ib txoj kab tshiab pretreatment rau UK cov neeg siv khoom.
https://youtu.be/R431fLl4PwU
