What does it mean for Tianjin to sound the air defense alarm?

Air defense alarm is an important part of urban air defense engineering. It is an alarm that sounds to remind people to pay attention to air defense when the city is threatened by air strikes. Air defense warning is not only used in wartime, but also used to commemorate some major events, disaster prediction and emergency notification in case of emergency rescue and disaster relief and sudden accidents.

Today (National Defense Education Day), Tianjin will try to sound the warning of air defense and disaster prevention. On September 5th, the alarm sounded from 10 to 10: 30.

On the same day, the city's fixed alarm points and civil air defense vehicle alarms will sound alarm signals in a unified manner. The city will release prompt information simultaneously through TV and SMS, and some crowded places will use indoor alarm facilities to synchronize early warning. The alarm test signal will be divided into three steps. Step 1 Pre-alarm: ring for 36 seconds, stop for 24 seconds, repeat for 3 times, and the time is 3 minutes; The second step is air raid and disaster warning: sound for 6 seconds, stop for 6 seconds, and repeat 15 times for 3 minutes; Step 3: Disarm the alarm: Play the long sound continuously for 3 minutes.

According to the staff of the Municipal Civil Air Defense Office, the city's alarm trial has been continuously carried out for 1 1 year, during which a week-long civil air defense publicity and education week will be held.