浅埋旺采工作面厚层坚硬顶板裂纹产生至大面积冒落时间差研究
천매왕채공작면후층견경정판렬문산생지대면적모락시간차연구
Study on the time difference from initiating cracking to large area caving of thick-hard roof on shallow Wongawilli face
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