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三峡工程是一个具有防洪、发电、航运等综合效益的巨型水利枢纽工程，枢纽主要由拦河大坝、水电站厂房、通航建筑物三大部分组成。坝顶全长2309m，最大坝高181m。大坝由左岸非溢流坝段、左厂坝段、左导墙坝段及导墙、泄洪坝段、右纵坝身段、右厂坝段及右岸非溢流坝段等组成；电站厂房分左右岸布置，共装机26台，总容量18200mw；通航建筑物由双线连续五级船闸、垂直升船机、临时船闸及上下游引航道组成。三峡工程施工场面