华北煤矿区
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North China Coal Mining Area
以上为机器翻译结果,长、整句建议使用 人工翻译 。
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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