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METHOD OF DETERMINING ABSOLUTE VALUES OF STRAIN IN WEAK COAL SEAMS
METHOD OF DETERMINING ABSOLUTE VALUES OF STRAIN IN WEAK COAL SEAMS
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机译:确定弱煤层应变绝对值的方法
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摘要
the invention относитс to the case. the purpose of изобретени - повьшение accuracy for speed. : in the coal seam бур т keyhole and cut a slot in the face of the well. with the sweat напр же1ш power
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