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1．全国金矿钻探技术经验交流会于1989年8月在哈尔滨召开，图为大会会场2．地矿部勘查技术司李常茂司长（中）致开幕词
1. The national gold mine drilling technology experience exchange meeting was held in Harbin in August 1989, the picture shows the conference venue 2. Ministry of Geology and Mineral Exploration Division Li Changmao director (center) to the opening speech