[IfcGeneralMaterialProperties.MassDensity property 质量密度 public IfcMassDensityMeasure MassDensity { get; set; } 也可以看看 class IfcMassDensityMeasure class IfcGeneralMaterialProperties 命名空间 Aspose.CAD.FileFormats.Ifc.IFC2X3.Entities 部件 Aspose.CAD]
