[IfcMaterialConstituent.Fraction property 分数 public IfcNormalisedRatioMeasure Fraction { get; set; } 也可以看看 class IfcNormalisedRatioMeasure class IfcMaterialConstituent 命名空间 Aspose.CAD.FileFormats.Ifc.IFC4.Entities 部件 Aspose.CAD]
