In many places across the country, sound the air defense alarm! How are you feeling at this moment?

My heart is extremely heavy, and I can only silently mourn for the innocent, remember history, never forget the national shame, and build a strong motherland.

The original intention of the air raid siren device is to tell us not to forget the tragic history of the Anti-Japanese War. The air raid alert evolved from the bomb shelter alert. At that time, the scientific and technological strength and related technologies were not developed enough.

In order to evade bombardment by enemy bombers and missiles. When we found that the plane heard the sound of shells being fired, someone would take the initiative to raise the alarm and ask everyone to hide in the bomb shelter to protect their lives. Usually this kind of alarm will be installed on various streets and alleys.

For example: on the loudspeakers of campus propaganda; public transport broadcasting equipment; In the broadcast of various shopping malls, as well as some large buildings, in accordance with relevant national regulations, it is necessary to install some relevant alarm equipment. And these warning devices, when the critical moment, the state can immediately connect to these devices, so we can hear air defense sirens everywhere in normal times.

About the air defense alert installed in **? Why can it be heard anywhere in the city? I have the following points.

An air defense siren is not just an alarm, it is a mark of history. Let each of us recall history, never forget history, have the courage to struggle, and be positive. Therefore, such devices are set up in every corner of the city, not forgetting the history, forging ahead, and the air defense siren has always inspired us.

The most common locations for air raid alerts are located around schools and in the vicinity of relevant police agencies. It is set up next to the school to cultivate students' awareness of air defense sirens from an early age, so that everyone knows that there is danger and is about to flee when they hear this siren, and it is very important to tell students to protect their lives. Placed next to the police to tell everyone that this place is safe and can be taken over.

There is also a certain openness in the place where the air defense alarm is set. Because the sound of air raid sirens is too loud, if it is set up in some high-rise dense areas, the noise pollution caused may affect some social safety issues.

It is to put some equipment at the city alarm point, and when it sounds, this sound travels very quickly in the sky, so it can be heard in any corner of the city.

This kind of alarm is generally installed in the streets and alleys, and this alarm is not one but many, so when the alarm sounds, the whole country can hear this sound.

It is installed in streets and alleys, such as on the radio of shopping malls, on the loudspeakers of campus propaganda, etc. Therefore, when we hear such voices, we must stop, remember history, and never forget the national shame.

This thing is installed on the top of some tall buildings, and the location is also set, so it can be understood in many places.

The reason why the air defense siren sounded again in the sky over Chongqing was to commemorate some compatriots who were killed in the bombing of Chongqing during the War of Resistance Against Japanese Aggression and to enhance people's patriotic enthusiasm.

This is an activity to commemorate the compatriots killed during the bombing of Chongqing during the War of Resistance Against Japanese Aggression, and I hope that we will remember history and never forget the national shame.

This is to commemorate the Japanese invasion of Chongqing from 1938 to 1943, which took place in a particularly large **, with 24,000 casualties.

The days when the air defense siren was sounded were the 918 Incident, Wenchuan**, etc. Air defense alarm is an important part of urban air defense engineering, peacetime for disaster relief and disaster relief and emergency reporting in the case of sudden accidents, used for civil air defense in wartime, is the basic means for the people at all levels to implement civil air defense command, organize personnel evacuation, is the city is threatened by air raids to remind people of air defense.

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.

Generally, it will ring on September 18 every year, in order to remind the people not to forget the historical humiliation and work hard to win glory for the country.

In the event of war, disaster relief and sudden accidents, as well as national leakage days, memorial days, etc., the air defense alarm will be sounded, and the air defense alarm "is an important part of the city's air defense, which is used for disaster relief and disaster relief and emergency reporting in the event of an emergency; It is used for civil air defense in wartime and is the basic means for the people at all levels to carry out civil air defense command and organize the evacuation of personnel. It is a hail that sounded when a city was threatened by air raids, alerting people to an air raid siren.

In order to implement the "People's Republic of China Civil Air Defense Law", test the performance of the city's air defense warning facilities, and further enhance the citizens' national defense concept and civil air defense awareness.

Who told you that it was an air raid alert, it is simply inexplicable.