Tsev Cog Khoom Loj Tuaj Txog

Lub tsev cog khoom tau txhim kho cov kab tseem ceeb, uas yog tag nrho cov tuab kub-dip galvanized square steel, thiab tam sim no lub tsheb tau los txog thiab tab tom thauj khoom. Sab laug ntawm txoj kev yog qhov chaw ntawm lub tsev cog khoom