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· CANGZHOU KH : Donated teaching assistant, good deeds! · Notes for use of quick fluid connector · we have been got the certificiate of UKCA AND AD2000 · Installation of quick connect · Polishing process of stainless steel flange · How to inspect the welding quality of elbow fittings · How to eliminate valve cavitation? · Classification and general parameters of industrial valves · What is the main function of the valve? · Summary of the Work on the Eval...