题目内容
SAD照射时,要求必须
2021-12-13
A.先对机架角度再对源皮距
B.先对好距离再对机架角度
C.对好小机头方位角,再对距离
D.先对好照射野大小,再对距离
E.先设置好小机头角,再核对楔形板的角度和方向
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