Dab tsi peb siv rau cov khoom siv hlau

Peb lub Hoobkas tau lees paub los ntawm lub teb chaws, cov ntaub ntawv tshwj xeeb tuaj yeem hloov kho, ua tau raws li txhua lub teb chaws tus qauv yuav tsum tau (ASTM, BS1387, JIS, ect). xws li HG, YRD, uas tuaj yeem lav qhov zoo thiab ruaj khov ntawm cov khoom siv raw. Cov khoom tuaj yeem ua tiav Q195,235,235B,345