A compound warning device was designed, It has the follow ing functions: (1) Alarming when smoke and gas exceed the provided standards, an d at the same time the ventilation system can work automatically; (2) Alarming when human body is approaching; (3)
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文川.复合式语音报警服务系统[J].重庆工商大学学报(自然科学版),2002,(3): WEN Chuan. A Service System of Compound Sound Warning[J]. Journal of Chongqing Technology and Business University(Natural Science Edition),2002,(3):