应急转换开关
emergency commutator switch
火灾应急照明
emergency lighting system in a fire accident
火灾应急照明设计
Design of Fire Emergency Lighting
民用建筑应急照明设计
Design of Emergency Lighting for Civil Building
消防应急照明
fire emergency lighting
fire control emergence illumination
消防应急照明系统
emergency lighting for fire protection
应急照明电源
emergency illumination power source
Power Supply for Emergency Lighting
应急照明控制
Emergency Lighting control
应急照明配电盘
emergency lighting switchboard
应急照明配电设备
emergency lighting distribution equipment
应急照明配电箱
emergency lighting distribution box