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，时间间隔为15秒。
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，时间间隔为15秒。
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