[IfcResourceTime.ActualUsage property ActualUsage public IfcPositiveRatioMeasure ActualUsage { get; set; } 也可以看看 class IfcPositiveRatioMeasure class IfcResourceTime 命名空间 Aspose.CAD.FileFormats.Ifc.IFC4.Entities 部件 Aspose.CAD]
