Notice of the Xining Municipal People’s Government on the trial of air raid siren
1, pre warning: Naruto 36 seconds, stop 24 seconds, repeated 3 times for a period, a total of 3 minutes;
2, air raid alarm: 6 seconds, stop for 6 seconds, repeated for a cycle of 15 times, sharing time for 3 minutes
3, alarm: continuous 3 minutes.
three, during the trial, please units, all citizens to protect the normal work, study, production and life order, and pay attention to distinguish familiar with air defense warning signal.