Merge branch 'WJC' into wxr7

wxr

2021-08-23 c877bc16eb02df246e48377101af0fa5ec626c14

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using System; 
namespace HDL_ON.Entity 
{ 
    public class AirCleaner  
    { 
        public AirCleaner() 
        { 
        } 
    } 
}