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各有关单位及各位工程技术人员:根据1987年第57届SEG年会期间由中国石油学会物探专业委员会(对外称中国石油物探学会即SPG)与勘探地球物理学家学会(SocietyofExplorationGeophysicists即SEG)签订的协议精神,每1～2年联合召开一次中小型国际学术交流会;每4年共同举办一次较大型
All relevant units and engineers and technicians: According to the signing ceremony of the 57th SEG Annual Meeting held in 1987 by the Petroleum Geophysical Commission of the Chinese Petroleum Society (externally known as China Petroleum Geophysical Society or SPG) and the Society of Exploration Geophysicists (SEG) Agreement spirit, every 1 to 2 years jointly held a small international academic exchange; co-held once every 4 years larger