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  • Vacuum Terminology
    Vacuum Terminology 1. Vacuum definition Vacuum system which is less than the region's rare book atmospheric gas state. 2. Vacuum degree The extent of the gas in the vacuum state rare book, usua...

  • Vacuum Equipment Industry Analysis
    Vacuum Equipment Industry Analysis Vacuum equipment industry development problems arise in many cases can not be optimistic, such as irrational industrial structure, industry focus on labor-intensive p...

  • Heat treatment on metals (1)
    Heat treatement on metals   Heat treatment is a method used to alter the physical, and sometimes chemicalproperties of a material. The most common application is metallurgical. Heattreatments a...

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