骨关节CT检查,一般采用()
A.平扫加增强扫描
B.仰卧患侧横轴位
C.定位像代替平片
D.俯卧双侧横轴位
E.骨窗和软组织窗并双侧骨关节对比观察
参考答案:E
It's nearly time for class to start. The teacher _____ be here soon. [ ]
A. can
B. should
C. shall
D. need
增压器使用和注意要点?