Physical, chemical and biological control methods in the purifying water process and the secondary water supply system in Chinese water supply industry are discussed.
重点介绍了目前国内供水行业所采用物理、化学以及生物的方法在水厂净水处理及二次供水过程防除摇蚊污染的研究；
For sensitive materials, Alliance can supply a gas-assist system with a secondary water injection, followed by a gas purge.
对于敏感材料，他们公司提供带有水辅功能的气辅系统。
For water supply system, the direct and secondary economic losses in earthquake are discussed. All kinds of influent factors on economic losses are introduced.
讨论了给水管网系统震灾的直接经济损失和引发经济损失，分析了影响各类经济损失的因素。
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