What are the top ten terror alerts for?

Terrorist warnings include air strikes, earthquakes, biochemical and nuclear strikes, and so on. The warning sound signal is required to sound for 36 seconds, stop for 24 seconds, and repeat for three times as a cycle, with a time of 3 minutes. It is characterized by "long interval", which is an alarm signal when the enemy is informed that the city is about to carry out air strikes. Li Jianxing said that in a state of war, citizens should immediately turn off power and gas after hearing the warning, take personal protective equipment and necessary daily necessities, and quickly and orderly enter civil air defense projects or designated hidden areas.

The sound signal of air raid alarm is required to sound for 6 seconds, stop for 6 seconds, and repeat 15 times as a cycle for 3 minutes. It is characterized by "short interval", which is an alarm signal when the enemy's air attack weapon approaches the city and has started or is about to attack the city target.

The sound signal for disarming the alarm is defined as the sound lasting for 3 minutes. Characterized by "no interval", it is an alarm signal when the threat of enemy air strikes has been lifted.