Taw qhia cov ntaub ntawv yas
Cov ntaub ntawv yas hais txog cov khoom uas muaj cov khoom yas nyob rau hauv qhov kub thiab ib txwm muaj thauj khoom. Nws tuaj yeem tsim los yog tsim los ntawm kev tuag forging, stamping, extrusion, thiab lwm yam. Muaj cov cuam tshuam muaj zog thiab kev co tsis kam, xws li tsis tshua muaj cov hlau, tooj liab, txhuas, yas, roj hmab thiab lwm yam.