Yam Khoom Yuav Tsum Tau Coal Safety Certificate

Cov khoom siv xws li coal cutters, cov neeg taug kev, kev txhawb nqa hydraulic, ib leeg hydraulic props, crushers, siv conveyors, scraper conveyors, hydraulic twj tso kua mis chaw nres tsheb, coal-powered xyaum xyaum, pneumatic xyaum, tawg-pov thawj keyboards, transformers, thiab cov kiv cua hauv zos, ntawm lwm tus, raug yuam kom tau txais daim ntawv pov thawj kev nyab xeeb thee rau siv hauv cov mines thee.

Nyob rau hauv lub subterranean ib puag ncig, Nws yog ib qho tseem ceeb rau suav txog kev nyab xeeb yam xws li nplaim taws retardancy, Kev tiv thaiv tawg, thiab kub-kub kuj los xyuas kom meej kev nyab xeeb.