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Ашигт малтмалын үлдээц, хаягдлыг багасгах арга боломжоор далд ашиглалтын аргаас илүү байдаг. Ил ашиглалтын эдгээр эерэг ба сөрөг үр дагавар бүхий онцлогуудыг харгалзан үзэж ашигт малтмалын тодорхой ордод хэрэглэх эсэхийг шийдвэрлэнэ. Далд буюу гүний ашиглалтын арга нь газрын гүн дэх малталтуудын оролцоотой ашигт малтмалыг …
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