Yog hom General hom rau Tsuas yuav tsum tau ib thee kev ruaj ntseg certificate

Tej khoom ua hauj lwm ncaj qha mus rau subterranean tej chaw los yog associated nrog underground apparatus yog mandated kis tau los ntawm thee kev ruaj ntseg daim ntawv pov thawj.

Qhov no yuav xyuas kom adherence rigorous kev ruaj ntseg tseem ceeb heev rau cov haujlwm hauv tej hazardous mob.