关于股骨正位摄片条件选择,正确的是()
A.使用滤线器
B.平静呼吸方式
C.FFD为75~120cm
D.总滤过≤25mm的铝
E.体表入射剂量≥1.0mGy
参考答案:A, B, C
She more friends than anyone else I have known.
A.used to have
B.was use to having
C.was used to have
D.accustomed to have
既满足当代人需要,又不对后代满足其需要的能力构成危害的发展模式即为______。