The shortwall ladder prop mining method namely strip extraction has been more extensively applied currently in small coal mine of Shaanxi province.
短壁刀柱采煤法即
采,目前在陕西省小煤矿采中较广泛应
。
The shortwall ladder prop mining method namely strip extraction has been more extensively applied currently in small coal mine of Shaanxi province.
短壁刀柱采煤法即采,目前在陕西省小煤矿采中较广泛应。
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