cov neeg yuav khoom yuav cov yeeb nkab steel galvanized ua ntej, siv tsev cog khoom.

Tom qab pom cov khoom, cov neeg siv khoom txaus siab rau peb cov khoom. cov neeg siv khoom kuj yuav cov yeeb nkab hlau dub thiab cov hlau galvanized.

Peb yeej xav ua phooj ywg zoo dua thiab tsim kom muaj kev sib raug zoo mus sij hawm ntev.