Cov hniav nyiaj hniav kub zam yog ib feem tseem ceeb heev ntawm kev lag luam hniav nyiaj hniav kub tag nrho, thaum ib qho ntawm cov teeb meem koj ntsib tam sim no yog ntau cov hniav nyiaj hniav kub zam tsis ntev, zoo li pheej yig.

xyoo thiab peb muaj qee tus neeg siv khoom thov kom qib qib zam zam zoo nkauj, sib piv nrog cov khoom lag luam zam zoo nkauj, hauv qab no yog qhov sib txawv rau peb cov qib kawm qib siab:

1) cov khoom sib txawv, siv tooj dag, hlau tsis muaj xim lossis nyiaj los hloov zinc hlau los yog hlau …

2) nrog txhuam zoo dua, yog li cov hlau saum npoo yuav zoo dua du thiab ci;

3) zoo dua plating, siv cov xim kub tiag tiag tsis txhob siv cov xim kub plating.

Txheeb nrog peb kom paub meej ntxiv yog tias koj xav ua haujlwm nrog peb.