[IfcMechanicalSteelMaterialProperties.Relaxations property 放松 public IfcCollection<IfcRelaxation> Relaxations { get; set; } 也可以看看 class IfcCollection<T> class IfcRelaxation class IfcMechanicalSteelMaterialProperties 命名空间 Aspose.CAD.FileFormats.Ifc.IFC2X3.Entities 部件 Aspose.CAD]
