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2.2 Key projects
中國(guó)大運(yùn)河技術(shù)史

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2.2 Key projects

        North Canal was improved from Chaobai River (below Tongzhou wascalled Luhe River).It had high gradient and variation of discharge inhigh and low water volume.At its downstream,three rivers jointtogether and became the main stream of Haihe River.Northeast     (共 2427 字)     [閱讀本文] >>

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