单项选择题

In which of the following techniques may a patient be asked to hold the film packet during exposure

A．bisection of the angle
B． paralleling
C．bitewing
D．occlusal
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问答题
简要叙述根尖周炎的三种类型及其影像学表现和鉴别诊断。
单项选择题
Which of the following is considered to be an extraoral technique
A．bitewing
B．panoramic
C．paralleling
D．occlusal
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