A.少量牙骨質(zhì)覆蓋在釉質(zhì)表面 B.多量牙骨質(zhì)覆蓋在釉質(zhì)表面 C.釉質(zhì)與牙骨質(zhì)端端相接 D.釉質(zhì)與牙骨質(zhì)分離 E.釉質(zhì)少許覆蓋牙骨質(zhì)