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研究二级龙亭引水隧洞开挖施工方案。左一为总工马中行,左四为工程处副处长赵振平,左五为工程处处长李志,左六为苏联专家
Study on Longting tunnel diversion tunnel excavation construction program. The left is the total work of the Bank of China, the left four deputy director of Engineering Zhao Zhenping, the left for the agency director Li Zhi, the left six for the Soviet experts