R & D here no characteristic difference between the standard surface, a large difference in the physical plane. R & D is recommended here feature requires clear
There is no face difference standard here in the R-D feature, and the physical face difference is large. It is recommended that the requirements of the features here be clarified by the R-D
There is no surface difference standard in the R & D characteristics, and the surface difference of the real object is large. It is suggested that R & D clarify the characteristic requirements here