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国家重点科技攻关项目——煤层注氮防火灭火技术日前在山西省西山矿务局试验成功并通过了中国统配煤矿总公司组织
National Key Scientific and Technological Project - Coal Seam Nitrogen Fire Prevention and Extinguishing Technology Recently, the Xishan Mining Bureau of Shanxi Province successfully tested and passed the China National Coal Mine Corporation