1.Steel qauv kev lag luam daim ntaub ntawv kub dov galvanized nyob rau hauv lub steel qauv kev lag luam yog tsuas yog siv rau lub teeb steel qauv tsev thiab rhiav, lub ntsiab lub tsev skeleton yog galvanized txias-tsim steel, mas C steel, Z steel, pem teb bearing phaj thiab stee .. .
Nyeem ntxiv