二次供水 meaning in Chinese

secondary water supply

Hygienic specification for facilities of secondary water supply
二次供水设施卫生规范
4 . responsible for the management of second water supply
四负责二次供水的管理工作。
Pollution of reverse osmosis film and its cleaning
二次供水清洗消毒过程中消毒副产物的控制
Determination of second water resources quality in tangshan city
唐山市市区二次供水水质的监测
Comparison on the water quality hygiene shuation of secondary water supply and supply water centralized type
二次供水与集中式供水水质卫生状况比较

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