have any idea about class-A surface & class-B surface,,& how to convert a-class to b-class surface??

have any idea about class-A surface & class-B surface,,& how to convert a-class to b-class surface??

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I never heard in the last 15 years of class-b surface. Maybe someone did a little joke. Class-A Surface is a descrition of the quality of surfaces.

greetings

 
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class -B surface is a surface offset-ed from class A surface.and class-C surface is a surface which joins A and B surfaces.

 
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