Practices have proved that quick advancing techniqe is applicable in isolated unmined area Comprehensive top coal caving face.
实践证明,孤岛综放工
速推进技术是可行
。
;
;;
;;;Practices have proved that quick advancing techniqe is applicable in isolated unmined area Comprehensive top coal caving face.
实践证明,孤岛综放工速推进技术是可行。
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