Cov khoom siv hauv chaw ua si feem ntau yog cov khoom siv galvanized steel yeeb nkab, txheej txheej txheej txheej, tuab HDPE board, 6 tus qauv hlua thiab cov hlau tsis muaj hau ntswj.

Cov khoom siv chaw ua si sib tw yog cov khoom lag luam ib txwm muaj, thiab tseem lees txais kev cai tsim los ntawm cov duab. Txais tos DM peb rau nqe lus lossis phau ntawv teev npe.