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Desks and chairs refer to tables and chairs used for office use. In terms of materials, desks and chairs can be divided into panel desks and chairs, rigid desks and chairs, metal desks and chairs, soft desks and chairs, etc .; from the occasions of use, there are offices, open staff offices, meeting rooms, and reading rooms. , Library room, training classroom, laboratory, staff dormitory; from the use of functions are mainly divided: desk, office chair sofa, file cabinet, bookcase, etc. office chair From the perspective of material composition, it can be divided into: office chairs, PU leather office chairs, cloth office chairs, mesh office chairs, plastic office chairs, etc. From the use type, it can be divided into: boss chair, work chair, staff chair, supervisor chair, conference chair, meeting chair, ergonomic chair, etc. From the perspective of use, there are mainly offices, open staff offices, conference rooms, reading rooms, library rooms, training classrooms, laboratories, staf

There are not a few aerosols we use in life, such as Yunnan Baiyao aerosol, throat aerosol, inflammation aerosol, analgesic anesthesia, antipyretic and analgesic aerosol etc. , But these need aerosol filling machine to fill the bottle to reach the consumer, so that the drug aerosol can better serve us, let's talk about the working principle of this type of aerosol.    At present, the commonly used quantitative inhalation aerosol refers to that the drug-containing solution or suspension and the appropriate propellant are packaged together in a pressure-resistant container with a special system, and the content is sprayed out by the pressure of the propellant during use. . The propellant is the motive force for the atomization of the solution or suspension, and the medium for dissolving or dispersing the drug and other auxiliary materials. Since the physical and chemical properties of the agent cannot be completely consistent, when changing the type of propellant, it will cause a pre