Cov cuab yeej siv chaw ua si hauv tsev kawm ntawv tshiab tsim rau cov menyuam muaj kev lom zem

Peb cov khoom siv ua si hauv tsev kawm ntawv tus nqi sib tw.

Peb cov khoom siv hauv chaw ua si hauv tsev kawm ntawv tau koom ua ke nrog cov qauv hlau galvanized, hmoov txheej txheej, tiv thaiv yas thiab ntau yam dej num steel.

Cov khoom siv hauv chaw ua si hauv tsev teeb tsa tau yooj yim heev, peb muab cov kev qhia teeb tsa ua haujlwm zoo.

Cov khoom siv hauv chaw ua si hauv tsev kawm ntawv tseem xav tau cov ntaub pua plag los yog cov nyom dag rau cov menyuam muaj kev nyab xeeb los ntawm kev pheej hmoo ntog thiab raug mob.