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由中国煤炭学会、广西煤炭学会、山西矿业学院、合山矿务局联合召开的“倾斜长壁开采学术研讨会”于1990年6月
By the China Coal Society, Guangxi Coal Society, Shanxi Institute of Mining, Heshan Mining Bureau jointly held the “Longwall Mining Seminar” in June 1990