Sound the air defense alarm is one of a series of activities to commemorate the September 18th Incident. There are many warnings? Fire drill. Horn is an air defense alarm for trial sounding, but only from noon: 1 1: 35 to 1: 38. The trial sounding is an early warning, sounding for 36 seconds, stopping for 24 seconds, and repeating for three times is1cycle for 3 minutes.

From 1 1: 45 to 1 1: 48, try to sound the air raid alarm for 6 seconds, stop for 6 seconds, repeat 15 times, with a period of 1 for 3 minutes; 12:00- 12:03, try to ring the alarm for 3 minutes.

The reason for the audition in September 17.

In recent 10 years, Beijing tried to sound the air defense alarm three times. For the first time, in May, 2008, 19, 14: 28, in order to mourn the victims of Wenchuan earthquake, the whole city sounded an air defense alarm. The second time was September 20th, 20 14, and the third time was September 5th, 2065 438+09.

In addition to commemorating the May 19 Wenchuan earthquake, the recent events were all in September, but the specific dates were different. So why did 17 ring in September this year?

It turns out that China's "National Defense Education Day" is set on the third Saturday in September, and 20 15 is September 19 and 20 16 is September 17. The purpose of trying to sound an air defense alarm is to enhance citizens' awareness of national defense and air defense and disaster prevention, and to enhance their ability to recognize air defense alarm sounds.