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The rapid development of air filters is closely related to the development of military industry and electronic industry. In the first world war, the use of various chemical agents, asbestos fibre filter paper as the smoke filter layer of military gas masks came into being. The glass fiber filter medium is used in air filtration to obtain a patent in the United States in October 1940. In the 1950s, the United States studied the production process of glass fiber filter paper, and the air filter was improved and developed. In the 1960s, HEPA filters came out; In the 1970s, the filter paper of fine glass fiber was used as the HEPA filter of filter medium, and the filtration efficiency of particle size of 013 micron particle diameter was 99.9998%. Since the eighty s, with the emergence of new test method, use evaluation to improve and to improve the filtering performance requirements, found the HEPA filter there is a serious problem, and he had a higher ULPA filter performance. Countries are still working on it and expect more advanced air filters soon
Before discuss nursing position, let us know about the secret: small ears inside the baby's ears into three parts of outer ear, middle ear, inner ear, the middle ear is a relatively sealed chamber, in the front wall there is a small tube connected to the nose pharynx ministry, is called the eustachian tube.
A substantial reduction in the seamless rail joint, reducing the impact of rail wheels through joint, which saves line maintenance costs, prolong the service life of rail, abate the locomotive vehicle noise, etc., therefore, developed rapidly. In the 1930s, German and American railroads began to carry out small test lines, and by 1981, the world had laid a seamless line of about 300,000 kilometers, of which China lay about 8,000 kilometers
In order to motivate the team spirit, the prerequisite is to organize a good team first. A good team is not casually to members together, but to achieve a common goal, to determine the characteristics of team members, organize a good team, but the key to motivate team cooperation spirit and the starting point. A good team is to tap into the potential of team members and inspire each member's potential. Potential is an explosive force! It's a source from within, and from the outside that can be invoked. The most important thing is spiritual potential, which is one's will, attitude and character. Willpower comes from desire, and the greater the desire, the greater the willpower, and thus the greater the potential. By communicating with each other, we can find the correct direction of each person and set up the true ideal, to inspire the passion and motivation of employees. At the same time, we must also break the human frailty. Every one of us has negative, comfortable, hesitant, lazy, self-governing, easy to satisfy, these human frailties, we must be resolute in restraint
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