Why did the air raid siren sound on September 18 from 9:18 to 9:41?

Because of national conditions.

The alert system is divided into advance alert, air raid alert and disarming alert, with an interval of 7 minutes respectively. Pre-alarm, sound for 36 seconds, pause for 24 seconds, repeat three times. Air raid siren, sound for 6 seconds, pause for 6 seconds, repeat 15 times. To clear the alarm, the sound will be one long beep for 3 minutes. (36+24)*3+60*7+(6+6)*15+60*7+3*60=1380/60=23 minutes.

Air raid siren, sounding method: sound for 6 seconds, pause for 6 seconds, repeat 15 times. The time is 3 minutes and is issued when the enemy is about to attack us. ?

Clear the alarm, purpose: The alarm is sounded when an air raid or the war situation temporarily eases. The sounding method: one long tone, continuous sounding for 3 minutes.

On October 8, 2021, in order to prevent minors from being addicted to online games and safeguard the legitimate rights and interests of minors, the Ministry of Culture and Tourism issued a notice to deploy comprehensive law enforcement agencies in local cultural markets to further strengthen law enforcement in the online game market. Supervision. It is reported that the Ministry of Culture and Tourism requires comprehensive law enforcement agencies of cultural markets in various regions to work with industry management departments.

Focus on the implementation of management measures to prevent minors from being addicted to online games, such as time limit, real-name registration and login, etc., increase the frequency and intensity of law enforcement inspections of online game companies within the jurisdiction; strengthen network inspections and strictly investigate Online games published online without authorization; strengthen law enforcement and supervision in Internet service business premises, entertainment and entertainment venues and other related cultural market areas to prevent minors from entering business premises in violation of regulations.