Traditional Culture Encyclopedia - Weather forecast - Why did Shenyang whistle on April 27th?
Why did Shenyang whistle on April 27th?
According to "People's Republic of China (PRC) Civil Air Defense Law", Shenyang will try to sound the air defense alarm around May 1st and 11th every year. This spring, the Shanghai Sea will be held at noon on April 27th 12.
It is not easy to ensure that the alarm can be clearly heard in every corner of the city. With the acceleration of urban construction in Shenyang, there are more and more high-rise buildings. High-rise buildings will have an impact on the propagation distance and intensity of alarm sound. The blind spots and blind spots caused by these high-rise buildings were adjusted, and the alarm with higher power was replaced and the position was adjusted.
There are three kinds of air defense alarm signals: emergency alarm, standby alarm and disarming alarm.
This audition and the alarm sounded on the evening of September 18 every year are all signals of disarmament (a long tone of three minutes). This alarm is longer and more serious than the other two alarms. In peacetime, lifting the alarm can better express the connotation of peacetime warning.
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