what is Plywood BB/CC grade?

Commercial plywood BB/ CC grade

 For BB grade, the surface will be sanded two sides to achieve smooth surface,no defect.

 And as for CC grade, veneer surface that has open splits, mineral spot, streaks and other major visible defects of wood will be used as CC grade.the surface will be sanded once only

This is mainly use in furniture and it is usually only need face side.