Tsis yog tus qauv flange
Lus piav qhia luv luv:
Scope ntawm daim ntawv thov: Boiler thiab siab hlab ntsha, roj av, tshuaj lom neeg kev lag luam, shipbuilding, khw muag tshuaj, metallurgy, machinery, stamping luj tshib, zaub mov thiab lwm yam lag luam
