单项选择题
A.45% B.55% C.65% D.75% E.85%
A.上皮根鞘 B.牙乳头 C.上皮隔 D.成釉器 E.牙囊
A.腺样囊性癌 B.鳞状细胞瘤 C.成釉细胞瘤 D.多形性腺瘤 E.牙源性角化囊性瘤