中国女人真人一级毛片-超碰国产在线-深夜激情网-天天操综合-久久视频免费-91豆花视频-四虎影院成人-成人爱爱-96影院-亚洲免费网址-啪啪福利视频-亚洲午夜影视-日韩中文一区二区-欧美日韩中文字幕在线视频-一本一道精品欧美中文字幕

　　用于消防排煙系統(tǒng)中，當(dāng)有火警發(fā)生時(shí)可通過(guò)該按鈕來(lái)緊急開(kāi)窗排煙。緊急按鈕線路在遇到開(kāi)路或者短路故障，排煙窗會(huì)立即自動(dòng)開(kāi)啟，保障了消防排煙窗系統(tǒng)的可靠性。

Used insmoke exhaust system, to open window and exhaust smoke by manual emergencybutton when firing, smoking window will open automatically when there is somewrong with open circuit or short circuit of emergency button line, Guaranteethe high performance of smoke exhaust system.