单项选择题

In which of the following techniques is a film holder a necessity

A． occlusal
B． paralleling
C．bisection of the angle
D．lateral oblique mandible
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单项选择题
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
单项选择题
Which of the following projections images the crowns of both maxillary and mandibular teeth on the same film and is helpful in diagnosing interproximal dental caries
A． panoramic
B． periapical
C．bitewing
D．occlusal
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