问题
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
答案
参考答案：B
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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
参考答案：B