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综放开采顶板管理问题的解决 ,使郑煤集团公司采煤工艺取得突破 ,为豫西煤田的开发走出一条高产高效的路子
The solution of roof management in fully mechanized top-coal caving has made breakthrough in coal mining technology of Zhengzhou Coal Group Co., Ltd. and developed a high-yield and high-efficiency road for the development of western Henan coalfield