Alarm indication signal (AIS) should be progressive response, light first and then sonance follows, the time interval should be 15 secs.
警信号逐级相,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.
警信号逐级相,后声,时间间隔为15秒。
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