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METHOD FOR IMPROVING EFFICIENCY OF PRELIMINARY MOISTENING OF PERMAFROST COAL SEAMS
METHOD FOR IMPROVING EFFICIENCY OF PRELIMINARY MOISTENING OF PERMAFROST COAL SEAMS
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机译:提高永久冻土煤层初湿效率的方法
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摘要
FIELD: mining industry. SUBSTANCE: coal seam is opened by drilling bore-holes. Prior to injecting water into seam, it is selectively thaw to free it from ice inclusions, small fractures and porous in mass with remaining ice in large fissures. EFFECT: high efficiency. 1 dwg
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