Cov xwm txheej ib puag ncig rau kev siv cov chaw nres tsheb hom thawv
Cov xwm txheej ib puag ncig Lub thawv-hom substations yog siv rau hauv cov tsev nyob siab, cov tsev so khoom kim heev, cov tiaj ua si square, cov chaw nyob, cov chaw tsim khoom me me thiab nruab nrab, cov mines, cov chaw roj, thiab lub zog tsim kho ib ntus rau cov chaw xws li cov kab ke faib hluav taws xob kom tau txais thiab faib ...
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