α半水石膏
alpha hemihydrate gypsum
hemihydrate plaster
calcium sulfate hemihydrates
傍河型地下水水源地
riverside groundwater resource field
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
城市中水石灰深度处理
advanced lime treatment of municipal reclaimed water