保水效率
water retaining efficiency
层拉平水平切片
horizontal slice of level flattening
差动水平尾翼
differential horizontal tail
超越概率水平
transcend proximity level
城市节水水平
the level of city water-saving
城市节水水平综合评价
Comprehensive Assessment of Urban Water Saving Level
工程调水效率
water transfer efficiency of project
供水水平
amount of water - applied
irrigation rate