Rhuav tshem rauj yog ib theem-theem lub cev muaj zog rau ob chav rwb thaiv tsev tuav cov cuab yeej siv hluav taws xob, nws muaj kev nyab xeeb thiab ntseeg tau, ua haujlwm tau zoo thiab ua haujlwm yooj yim thiab lwm yam. kho kom zoo nkauj, chaw nres nkoj chaw thiab lwm yam kev tsim vaj tsev tsim kho, thov xaiv cov brazing lossis lwm yam kev txuas uas tsim nyog, Xws li txiab, duav thiab lwm yam kev ua vaj tse, masonry qauv, asphalt pavement rau crushing, chiseling, khawb, slotting, txiav thiab lwm yam haujlwm.
