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1993年 12月24日,中国三峡总公司与中南院三峡建设监理中心签订了双线五级船闸一期开挖工程委托监理合同。
On December 24, 1993, China Three Gorges Corporation and the Three Gorges Construction Supervision Center of Zhongnan Hospital signed a commission contract for the supervision of the first phase of double-line five-stage shiplocks.