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1986年3月18~20日,由河南省水利厅主持的预应力钢筋混凝土空腹桁架渡槽(见照片)技术鉴定会
From March 18 to March 20, 1986, the Technical Appraisal Conference of Prestressed Reinforced Concrete Fast Web Truss Aqueducts (see photos) chaired by Henan Provincial Department of Water Resources