Alarm indication signal (AIS) should be progressive response, light first and then sonance follows, the time interval should be 15 secs.
告警信号应逐级相应，先光后声，
间间隔为15
。
间间隔Alarm indication signal (AIS) should be progressive response, light first and then sonance follows, the time interval should be 15 secs.
告警信号应逐级相应，先光后声，间间隔为15。
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