Taw qhia: Raws li kev tsav tsheb rau ntau yam khoom siv tshuab xws li kiv cua, twj tso kua mis, compressors, tshuab cuab yeej, thiab conveyor siv, lub cev muaj zog yog cov khoom siv hluav taws xob siv hluav taws xob ntau nrog ntau daim ntawv thov thiab ntau yam kev siv. Ntau tshaj 60% ntawm kev siv hluav taws xob. ...
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