在我国华北煤矿区，回采工作面煤层底板突水问题相当严重，困扰着煤矿经济效益的正常发挥。
Water inrush from the bottom coal layer in mining work faced now is rather serious in Northern China coalfield, which constraints seriously the normal economical benefits.
在我国华北煤矿区，回采工作面煤层底板突水问题相当严重，困扰着煤矿经济效益的正常发挥。
Water inrush from the bottom coal layer in mining work faced now is rather serious in Northern China coalfield, which constraints seriously the normal economical benefits.
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