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ڣ2019-07-22  Դwww.ffposifuoasis.org

  ЉҼǴֱwλeϵ_зQ̖ЉȣֻT϶ЉThe unit of pressure is usually the atmospheric pressure, which is revealed by the kilogram force/centimeter 2 in the unit system of the project, and the water column or mercury column when the pressure is low. The pressure units adopted at home are different, with invalid "bar", "Pa", Newton (N) or pound, etc

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