氟牙症的病理表现主要是
A．牙釉质的有机质增加
B．牙釉质间质发育不良
C．多孔型病理结构塌陷
D．牙釉质矿化不全
E．釉柱钙化不全
参考答案：D
My classmates are all nice ______ me. I love them very much.
[ ]
A. for
B. on
C. to
D. with
完整的X线胶片特性曲线的组成不包括
A．趾部B．直线部C．肩部D．反转部E．高清晰部
