CR与DR系统应用比较,相同点是()
A.成像方式
B.操作方式
C.床旁摄影
D.可应用于常规摄影
E.与常规X线设备匹配
参考答案:D
— Is this machine often in need of repair?
— No. _____ problems to arise. [ ]
A. Never had we wanted
B. Hardly did we wish
C. Never do we hope
D. Seldom do we expect
组织和细胞处于绝对不应期时,其兴奋性()。
A.无限大
B.为零
C.不变
D.低于正常水平
E.高于正常时的阈强度