Wu-Ritt特征集方法
Wu-Ritt’s characteristic set method
特大型水电机组
giant hydropower generators
特大型梯级水利水电工程
supergiant cascaded water resources and hydropower
特大型推力球轴承
super large-size thrust ball bearings
特大型涡轮发电机
super-huge turbo-generator
特大型桩基础
large group pile foundation
特大雪灾冻害
big snow and frozen disaster