====== Unit System ======

XT所有的数据在内部安装国际标准单位制保存， 用户可自定义视图单位系，使得界面以合适的单位系显示数据并与用户交互。视图单位系的单位类型如下表所示，在对话框XML文件中可通过unit定制标签的单位属性，可通过DX_UnitEdit与界面交互带单位属性的数据。


^单位枚举量^ 类型字符串 ^ 类型ID ^
|Unit_Length|"Length"| 0 |
|Unit_Time|"Time"| 1|
|Unit_Mass|"Mass"| 2|
|Unit_Force|"Force"| 3|
|Unit_Angle|"Angle"| 4|
|Unit_Temperature|"Temperature"| 5 |
|Unit_Area|"Area"| 6 |
|Unit_Volume|"Volume"| 7 |
|Unit_Velocity|"Velocity"| 8 |
|Unit_Acceleration|"Acceleration"| 9 |
|Unit_RotateVelo|"AngularVelocity"| 10 |
|Unit_RotateAcc|"AngularAcceleration"| 11 |
|Unit_Moment|"Moment"| 12 |
|Unit_Pressure|"Pressure"| 13 |
|Unit_Density|"Density"| 14 |
|Unit_Stiffness|"Stiffness"| 15 |
|Unit_RotateStiff|"RotateStiffness"| 16 |
|Unit_DampingCoef|"DampingCoefficient"| 17 |
|Unit_RotateDampingCoef|"RotateDampingCoefficient"| 18 |
|Unit_Modulus|"ElasticModules"| 19 |
|Unit_Energy|"Energy"| 20 |
|Unit_Power|"Power"| 21 |
|Unit_ThermalExCoef|"ThermalExpansionCoefficient"| 22 |
|Unit_ThermalConductivity|"ThermalConductivity"| 23 |
|Unit_ConvectionCoef|"ConvectionCoefficient"| 24 |
|Unit_SpecificHeat|"SpecificHeat"| 25 |
|Unit_HeatFlux|"HeatFlux"| 26 |
|Unit_HeatGeneration|"HeatGeneration"| 27 |
|Unit_LinearDensity|"MassPerUnitLength"| 28 |
|Unit_SurfaceDensity|"MassPerUnitArea"| 29 |
|Unit_AreaMomentInertia|"AreaMomentInertia"| 30 |
|Unit_TorsionalConst|"TorsionalConstant"| 31 |
|Unit_WarpCoef|"WarpingCoefficient"| 32 |
|Unit_LinearMassMomentIntertia|"MassMomentOfInertiaPerUnitLength"| 33 |
|Unit_MomentInertia|"MassMomentOfInertia"| 34 |
|Unit_Stress|"Stress"| 35 |
|Unit_Strain|"Strain"| 36 |
|Unit_StrainEnergy|"StrainEnergy"| 37 |
|Unit_ThermalEnergy|"ThermalEnergy"| 38 |
|Unit_Frequency|"Frequency"| 39 |
|Unit_VolumeEnergyDensity|"VolumeEnergyDensity"| 40 |
|Unit_ElectricalResistivity|"ElectricalResistivity"| 41 |
|Unit_StressReciprocal|"StressReciprocal"| 42 |
|Unit_ThermalRadiation|"ThermalRadiation"| 43 |
|Unit_DynamicViscosity|"DynamicViscosity"| 44 |
|Unit_KinematicViscosity|"KinematicViscosity"| 45 |
|Unit_FlowRate|"FlowRate"| 46 |
|Unit_VelocityReciprocal|"VelocityReciprocal"| 47 |
|Unit_EquivalentViscosity|"EquivalentViscosity"| 48 |

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