放疗摆位中治疗床转角的允许精度为()
A.+0.1°
B.±0.2°
C.±0.3°
D.±0.4°
E.±0.5°
参考答案:E
与CT比较,磁共振成像(MRI)的优点是()
A.图像清晰
B.层面连续
C.可区分肿瘤的性质
D.不用造影剂增强即能显示肿瘤的浸润范围
E.对骨组织病变显示好
John to London to watch the Olympic Games next week.
A.flies
B.flew
C.will fly
D.has flown