多项功能优化

Sai.RvKits/RvMEP/CorrectMEPCurveSlopeCmd.cs

@@ -119,7 +119,7 @@ public class CorrectMEPCurveSlopeCmd : ExternalCommand
             case Duct:
                 {
                     var param = mepCurve.get_Parameter(BuiltInParameter.RBS_DUCT_SLOPE);
-                    var loc = mepCurve.GetLocCurve() as Line;
+                    var loc = mepCurve.GetCurve() as Line;
 
                     isError = param.HasValue && ((param.AsDouble() < 0.025 && param.AsDouble() > 0) || param.AsDouble() > 0.055); //坡度过大或过小时
                     break;