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由冶金部列项,北京科技大学与冶金部矿山司共同开展的“矿山经济效益剖析理论与方法”的研究课题,自1989年11月至
By the Ministry of Metallurgy, Beijing University of Science and the Ministry of Metallurgical Mine Division jointly carried out the “theory and method of mine economic analysis theory” research project, from November 1989 to