中龋为病损发展到
A．牙釉质全层B．釉牙本质界C．牙本质浅层D．牙本质中层E．牙本质深层
参考答案：C
Which one of the following may appear on a periapical radiograph of the upper third molar area
A．external oblique ridge
B．mylohyoid ridge
C．coronoid process
D．condyle
野外作业人员的皮肤色素沉着是身体外表体征的改变之一。
