问题
单项选择题
Which of the following imaging techniques does not use X rays
A．panoramic radiography
B．computed tomography
C．digital radiography
D．ultrasonography
答案
参考答案：D
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Which of the following imaging techniques does not use X rays
A．panoramic radiography
B．computed tomography
C．digital radiography
D．ultrasonography
参考答案：D