Under what circumstances is the air defense alarm pulled, and why is the air defense alarm pulled to

There are three types of air defense alerts, namely advance alerts, air raid alerts, and de-alerts. The advance warning is a warning signal issued by the civil air defense headquarters when it judges that the enemy may attack the city according to the enemy situation in the air, and it first sounds for 36 seconds and then stops for 24 seconds, repeating three times for three minutes. The air raid siren is an alarm signal issued when the enemy's air raid is about to enter the city, and the sound sounds like a continuous and rapid short sound, sounding for 6 seconds and stopping for 6 seconds, repeating 15 times for a cycle, and the time is also three minutes.

The alarm is issued when it is clear that the enemy's air raid has ended and there is no other threat, and the sound is prescribed as a long tone that lasts for three minutes.

If, in wartime or during a exercise, you hear an air defense warning in advance, you should not panic, first close the doors and windows, turn off the power supply and natural gas, bring water, medicine, and relevant documents, and evacuate in a planned manner according to the location designated by the air defense department. If there are a few people who have not had time to evacuate after hearing the air raid siren, if they are indoors, quickly find a corner of the wall, under the table, and lie down. If you are outside, climb to the bottom of the steps in an open field or grass, and then cross your hands and put them on your chest, with your mouth slightly open to prevent the shock wave brought by **.

Every year on the third Saturday of September, Patriotic Education Day.

Three types of air defense alert meanings.

Pre-alarm: sound for 36 seconds, stop for 24 seconds, repeat 3 times, time 3 minutes. If you are in a wartime situation, after hearing the advance warning, it means that the citizens are reminded to bring the necessary supplies as soon as possible and find the nearest underground air raid room for concealment.

Air raid siren: After sounding for 6 seconds, stopping for 6 seconds, and repeating the air raid siren 15 times, it indicates that the public is currently under air raid.

Disarming the alarm: A long sound that rings continuously for 3 minutes indicates that the alarm is lifted and that there is no danger of air raids.

Foreign Civil Defense Communications & Alerts.

United States: Adopt a military-based civil defense communications and warning support system, which consists of the National Civil Defense ** System, the National Civil Defense Voice Communication System, and the National Civil Defense Radio System, which are established and managed by the Army's Strategic Communications Command. They have set up a national emergency broadcasting system that can deliver emergency information to more than 95 of the country's inhabitants.

Germany The German Civil Protection Act states: "The tasks of the alarm work are carried out by the Federal Civil Protection Service and its subordinate alarm bureaus and the departments of the alarm department." Cities, towns and townships are obliged to prepare, install, maintain and manage the equipment necessary for the work of alerting residents.

The civil protection authorities 'may instruct administrative agencies and enterprises that undertake important tasks relating to the national economy and people's livelihood to procure and maintain, at their own expense, the devices necessary for receiving alert notifications".

The Chengdu anti-siren test drill is from 14 30 to 15 30 today, and three kinds of air raid siren signals are tested. 14 30 is the "early alarm": sound for 36 seconds, stop for 24 seconds, repeat 3 times, last 3 minutes; 14 40 for "air raid siren":

Beep for 6 seconds, stop for 6 seconds, repeat 15 times, for 3 minutes; 15 00 is "Alarm lifted": a long sound for 6 minutes.

1. Large anniversaries.

2. Invaded by foreign enemies.

3. National Day of Mourning.

4. Air defense exercises.

On September 18, most cities will raise air raid sirens.

In peacetime, sometimes the air defense alarm is pulled in order to test the equipment, and it is generally informed in advance through **.

When the air defense is fighting, pull ah ......

In addition to this, air defense exercises are also pulled. There are days of great significance, and also pull the air defense alarm. For example, the three eastern provinces were all pulled on September 18.

Drills, I've heard it several times in Shenzhen, noisy to death...

It's not an air raid siren but a fire siren, because it's the 119th anniversary, why don't you even understand this, so stupid.

It is used for civil air defense in wartime, and is the basic means for the people at all levels to implement civil air defense command and organize personnel evacuation, and it is a warning that sounded to remind people of air defense when the city is threatened by air raids.

In wartime, communications, radio, and television systems must give priority to transmitting and issuing air defense warning signals, and auxiliary means such as whistles, horns, and bells and gongs can also be used. According to the location of the sound alarm, it is divided into fixed and mobile; According to the energy conversion mode, it is divided into electric type, electroacoustic type, pneumatic type and hand-cranked type.

Dear, if the air defense siren sounds, there may be several reasons:1War or military exercises:

In the case of certain natural disasters such as tornadoes, **, etc., when ** is likely to be dangerous, air defense equipment can sound an alarm to remind the population to take necessary safety measures. 3.Technical glitch:

Air defense warning systems can be caused by technical failures and false alarms, especially in relatively old equipment. Please note that these reasons are for informational purposes only and are not exhaustive. You need to judge the actual situation and take appropriate safety measures.

Air defense alert. It was sent from the horn of the siren of the air defense warning equipment.

Job. The main tasks include: announcing air defense warning signals, publicizing them widely, and organizing test drills; Air defense warning signals should be issued at appropriate times, advance warnings should be issued when the enemy is likely to carry out air raids, air defense warnings should be issued when obvious signs of enemy air raids are discovered, and disarming warnings should be issued when the danger of enemy air raids has been eliminated.

Air defense alerts are usually issued sequentially, and air raid alerts can be issued directly when the air raid situation is sudden and urgent and cannot be issued.

Two of them are the high-pitched building desktop alarms placed on the major tall buildings! The second is that the alarm cars are all owned by the local security divisions, and when the alarm needs to be pulled, they will drive to a block!

At the top of the city's high-rise buildings there are high-intensity horns, and it's from where the alarm is issued.