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1989年6月以地矿部勘查技术司李常茂司长为团长的中国地矿部钻探代表团一行五人赴苏访问。同年10月5日至14日以苏联地质部科技局苏达尔金副局长为团长的钻探代表团一行六人回访了我在京有关单位;1989年11月苏联莫斯科地质勘探学院钻探教研室主任、技术博士A.r.加里宁教授来华访问时介绍2000年苏联钻探界的情况将是、钻探年进尺将达3000万m
In June 1989, five Chinese and Mines drilling delegations led by Director Li Changmao of the Exploration and Production Technology Department of the Ministry of Geology and Mineral Resources visited the Soviet Union. In the same year, from October 5 to October 14, a delegation of 6 people, headed by Deputy Director General Su Dahlkin of the Soviet Bureau of Geology and Technology, visited our relevant units in Beijing. In November 1989, Dr. Director of the Drilling Department of the Moscow Institute of Geological Prospecting, Soviet Union, Dr Ar Kalinin’s visit to China in the introduction of the situation in the Soviet drilling community in 2000 will be that drilling footage will reach 30 million m