A.形態(tài)發(fā)育正常 B.牙槽骨健康 C.活髓 D.牙體組織結構正常 E.足夠的牙體組織
A.2/5 B.1/5 C.1/4 D.1/3 E.1/2
A.40° B.30° C.20° D.10° E.5°