Excuse me, what is the difference between the two standards EN 14470 1 and EN 14470 2 in the EU?

EN 14470-1 and 14470-2 are both European safety standards, EN 14470-1: A new European standard that came into force in October 2004 and addresses the storage of flammable products in laboratories. Only the internal volume of the safety cabinet is equal to or less than 1 cubic meter.

EN 14470-2: A new European standard came into force in April 2006 for the storage of high-pressure gas cylinders in laboratories. Only the inside of the safety cabinet allows storage of cylinders below 220 liters.

According to the fire performance requirements, it is divided into 4 categories: 15 minutes, 30 minutes, 60 minutes, and 90 minutes.

In the event of a fire, the cabinet should ensure that the contents of the cabinet do not pose any additional risk or spread of fire for at least 15 minutes.

Cabinet doors should close completely automatically from any position. The door must not be closed for more than 20 seconds from the time it is released. The time it takes to close the door from a fully open position or from a position that remains open should be measured using a stopwatch with a temperature of (20 5).

If the cabinet includes a keep-open function, the door should be completely closed when the temperature reaches 50.

Therefore, it should be placed in free-circulating air so that it can heat up quickly.

The temperature release parts of the shut-off device shall confirm compliance with the requirements specified in the manufacturer's declaration of conformity. The door and its surroundings should be designed to minimize the risk of pinching. In order to reduce the damage by closing the door, the static force between the main closing edge and the reverse closing edge should not exceed 100 N

Each door can be operated with one hand. If the door is lockable, the locking device should not compromise the required self-closing performance. The side and back walls, the side walls and the back walls of the cabinet should have the same thickness and the same structure.

Don't worry, there is no book so far that will allow you to quickly learn all the basics of the military.

The reason is that military science is a huge and complex content, with both liberal arts and sciences.

As you said about the issue of fighter aircraft, it is necessary to understand some science and engineering knowledge, and if you study it deeply, it will be the category of military science and technology, which belongs to military equipment.

And what letters and abbreviations represent ** and military terminology, this kind of thing is a military foreign language when you learn it deeply.

If you want to know the ins and outs of a major battle, that is military historiography.

There are also some things that make people look like they are not military content at all, such as solving the problem of buying as much ** as possible with the least investment to achieve the purpose of operation, this discipline is called defense economics.

For example, if 100,000 troops have cars and walk, they can cross the three bridges in front of them as soon as possible, and this discipline is called military operations research.

Military science can be pondered for a lifetime, and there are many problems that you still can't study thoroughly. So don't rush and accumulate slowly. It seems that you are not a professional soldier, let alone worry.

"Four major course groups", forming a basic course group with mathematics, physics, foreign language, and computer as the core; military courses with military theory, military foundation, and management disciplines as the core; A group of science and engineering courses with physics and chemistry, mechanics, electrical and electronics, drawing disciplines and basic laboratories as the core; A group of humanities courses with Chinese, management, and military theory as the core. "Military Theory", "Urban Air Defense Operations", "Ocean and Coastal Defense".

If it is this course, most schools will take it, regardless of arts and sciences, but if it is a major, it is science and engineering.

All military majors are studied, and there are more science majors.

You have to learn both arts and sciences. This is a basic course. The exam was easy. A few are basically copyed. The score for good-looking words is relatively high. It's sweaty

Generally, this is an elective course, and it's considered a liberal arts course.

Military theory is a public course.

Basically, all college majors have to take this course, and it's related to politics.

There are many ways to learn: reading books, reading newspapers, watching television, listening to the radio, and surfing the Internet.

It is now the most economical and resourceful way to learn, learning is like eating, you have to eat one bite at a time, just like walking step by step, slowly accumulating, accumulating steadily. The important thing is to persevere, to be persistent, and you will become more and more knowledgeable and become a real military fan.

"Military Intelligence" and some CCTV-related military programs are good, and "World Military" and "Weapons Knowledge" are good.

Military affairs and history are somewhat related, so you should also look at historical things, don't read some stall military newspapers, those things are too extreme, and you will become angry when you read them.

You go to buy military liao (I can't type this word) on a regular basis, this book is very detailed, the amount of knowledge and information is large, easy to understand, it is available on the stalls, and there is also a military intelligence weekly.

Example: J-10 J is the abbreviation of the Chinese pinyin of the Chinese fighter J.

Fighters do not have the ability to carry out precision strikes on the ground, and only attack aircraft.

Buy books on military fundamentals and study them at home

Buy a book of 100,000 whys of the military class and read it will help you,**Don't read it first, watch it first**7 This kind of program, there are experts who will explain it in detail, basically the questions you think of will be asked by the host. After a while, you will learn a lot about the military base.

Watching CCTV-7, easy to understand, my grandfather watched it every day.

There are many ways to learn: reading books, reading newspapers, watching television, listening to the radio, and surfing the Internet. 'Buying CDs is the most economical thing now, and accumulating knowledge should be done slowly and persistently. To a certain extent, you can become a military enthusiast.

No. I am currently an undergraduate student at Beijing Institute of Technology, so I know more about this aspect. Military engineering is a class of majors rather than a separate major, and the military majors of Beijing Institute of Technology are roughly as follows:

Aircraft Design and Engineering (now belongs to the School of Astronautics, the main direction of this major is missile engineering), Vehicle Engineering (now belongs to the School of Mechanics and Vehicles, the main direction is tank manufacturing), Ground Mobility Engineering (now belongs to the School of Mechanics and Vehicles, this major is the ace major of our school), Special Energy Engineering and Pyrotechnics Technology (now belongs to the School of Mechanical and Electrical Engineering), Ammunition Engineering and Technology (now belongs to the School of Mechanical and Electrical Engineering), ** System Launch Engineering (now belongs to the School of Mechanical and Vehicle), etc.; Other majors, such as chemical engineering and technology (fine chemical direction, this major is the original explosives direction of the explosives major, now belongs to the School of Chemical Engineering and Environment), polymer materials and engineering (this major is the original explosives major, now belongs to the School of Materials), biomedical engineering (now belongs to the School of Life Sciences), etc., although they are not complete military majors, they have corresponding military research directions, and have also undertaken many key national defense scientific research projects, and there are many key national defense disciplines.

Absolutely nothing. Military engineering is a profession with a wide range of aspects. Rather than a separate major, the military major of Beijing Institute of Technology roughly has:

Aircraft design and engineering, vehicle engineering, ground maneuver engineering, special energy engineering and pyrotechnic technology, ammunition engineering and technology, system launch engineering, etc.; Other majors, such as chemical engineering and technology, polymer materials and engineering, biomedical engineering, etc., are not complete military majors, but they have corresponding military research directions, and they are all majors related to the military industry, which cannot be regarded as military engineering.

The above two are both expert ......

Beijing Institute of Technology only has military majors, not military majors.

The military-industrial profession and the military profession are not the same thing.