Coal Mining Inserts
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Extracting hniav yog wildly siv rau thee mini ...
Daim ntaub ntawv Coal txiav hniav yog dav siv rau cov cuab yeej siv tshuab siv hauv cov mines thee.Lawv siv los txiav, tawg, thiab rho cov thee zoo.Cov hniav no zoo tshem tawm cov thee los ntawm cov coal txaj, ua kom yooj yim rau kev ua thiab kev thauj mus los.Coal txiav cov hniav tuaj yeem pom cov ntawv thov hauv kev tsim kho qhov.Lawv yog siv los txiav thiab tawg pob zeb, av, thiab lwm yam ntaub ntawv, pab nyob rau hauv tunnel excavation thiab kev tsim kho.Zoo ib yam li lawv siv hauv thee mining, thee cuttin...
