forging qhov chaw

Khoom siv: Muaj cov khoom sib txawv.

Txheej txheem: Kub forging, Txias taub hau machining, Rauj forging, Tuag forging thiab lwm yam.

Nto tiav: Sib txawv nto tiav yog muaj acc rau tus neeg siv khoom xav tau.