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METHOD OF OPENING-UP AN OUTBURST-HAZARDOUS COAL SEAM WITH A CROSSCUT
METHOD OF OPENING-UP AN OUTBURST-HAZARDOUS COAL SEAM WITH A CROSSCUT
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机译:用横切线打开突出危险煤层的方法
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摘要
method of opening выбросоопасного coal-bed кверпша gaume,включаюп s preliminary the unloading of formulation and subsequent autopsy coal-bed to разгруженном station квершлагом, differing and and with
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