水电流域梯级综合开发 the comprehensive and cascade development of areas with hydropower resources

梯级水平移动距离 step of horizontally moving distance ; horizontally step run

水电梯级开发 hydropower cascade development ; cascade development of hydropower

梯级水库 Cascade Reservoir ; cascade hydropower

水能梯级开发 step water conservancy project

梯级跌水 ladder of cascades ; fall drop in series

梯级水电工程 Cascade Hydropower Project

梯级水电系统 Cascaded hydroelectric stations ; cascaded hydroelectric system