单项选择题
A.上尖牙唇面距腭皱侧面约10.5mm B.老年患者上尖牙顶连线与切牙乳突后缘乎齐 C.老年患者上前牙切缘在上唇下露出1~1.5mm D.排成浅覆牙合、浅覆盖 E.上前牙唇面距切牙乳突中点8~10mm
A.33° B.25° C.20° D.15° E.10°