A.原發(fā)性牙本質(zhì) B.繼發(fā)性牙本質(zhì) C.功能性牙本質(zhì) D.修復性牙本質(zhì) E.以上都不對
A.3%以下 B.97% C.70% D.30% E.45%~50%
A.3% B.97% C.70% D.30% E.45%~50%