water flow-rate水流量
water flow-rate calibration水流量标准
water flow-rate calibration device水流量标准装置
water-retaining rate吸水率
water-supplying rate供水水价
water-lacking rate缺水率
water-displacement rate驱水效率
water-intake rate吸水率
water-keeping rate保水率
N（名词） a charge made for the public supply of water 自来水水费