单项选择题
A.1.2mm B.1.Omm C.O.9mm D.O.8mm E.0.7mm
A.10° B.20° C.30° D.40° E.45°
A.牙体预备产热 B.磨牙过多 C.消毒剂 D.制取印模 E.戴暂时冠