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Standard - No Sewing:  Default option - objects will be imported separately, and will not be sewn together
Single NURBS Brep - Sew Trimmed Surfaces:  Will create a single NURBS Brep object with surfaces sewn together.  Use this option if your import file consists of one single entity (represented by multiple surfaces in the originating model) that you want to join together to eliminate seams or gaps.
Each Trimmed Surface in Separate :  Imported trimmed surfaces will be created as separate objects.  No sewing will be performed.
Single NURBS Brep - No Sewing:  Creates a single NURBS Brep Object, but does not attempt to sew surfaces together

3D Trimming Tolerance
Normal:  Uses a default (normal) tolerance when creating objects and sewing them
Tight:  Uses tighter tolerances when creating objects and sewing
Very Tight:  Uses very tight tolerances when creating the imported objects and sewing them together.
Viewport Mesh Quality
Coarse:  Uses a minimum number of polygons to represent the objects.  
Medium:  Generates an average number of polygons.
Fine:  Creates a very dense and precise mesh.  This option will generate the most polygons, and the import will take a little longer.
Render Mesh Quality
Produce Size Dependent Render Mesh:  Generates render mesh during import operation (so that you can go straight to rendering quickly).  Render mesh quality will adjust based on the size of the object.   
Coarse:
  Uses a minimum number of polygons to represent the objects when rendering.  
Medium:  Generates an average number of polygons for rendering.
Fine:  Creates a very dense and precise mesh.  This option will generate the most polygons, and the most accurate rendering.
Options
Two Sided Trimmed Surfaces:  Generates two sided meshes (so that surfaces can be viewed from each side within 3ds Max)
Explode Assemblies into Separate :  Creates separate objects for each entity that is imported.
Sort Into EditableNURBS By Color :  Organize the imported data by color
Orient Surfaces :  Automatically correct surface normals that point inward.  It will attempt to unify the
normals on an imported surface.
More Files
More Files:  This option allows you to import multiple files (batch import).