Single level mountain development
...单水平上下山开拓;采区式准备;综合机械化采煤,走向长壁采煤法;分层开采;全部垮落法,中央边界式。 [gap=1165]Keywords: mining special preliminary design; Low gas mine; Vertical shaft; Single level mountain development; Mining type ready; Comprehensive mechanized mining longwall mining methods, to..
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