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
法即条带开,目前在陕西省小矿开中较广泛应
。
The shortwall ladder prop mining method namely strip extraction has been more extensively applied currently in small coal mine of Shaanxi province.
短壁刀柱法即条带开,目前在陕西省小矿开中较广泛应。
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