Emergency oxygen supply system, allowing passengers from chemical gas attacks.
紧急氧气供给系统，可以让乘客免受化学气体的攻击。
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；
The matters needing to attention of design of electrical system in new expand chemical project, and the measures for the improvement of feasibility of supply and distribution electric were introduced.
介绍了新扩建化工项目电气系统设计的注意事项及在设计中为提高供配电的可靠性所采取的措施。
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