问题
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
答案
参考答案：A
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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
参考答案：A