Raws li ib qho ntawm cov ua ductile hlau gully grating tuam ntxhab thiab cov muag khoom nyob rau hauv Suav teb, peb sov siab txais tos koj mus yuav cov qib high ductile hlau gully grating muag ntawm no los ntawm peb lub hoobkas. Tag nrho peb cov khoom yog nrog cov khoom zoo thiab cov nqi sib tw.











