腹部CT扫描受检者的准备,与图像清晰度有关的是()
A.禁食
B.胃肠道清洁
C.碘过敏试验
D.屏气训练
E.口服低浓度碘水对比剂
参考答案:D
体力较好的患者呼吸练习时宜采用的体位为()。
A.仰卧位
B.俯卧位
C.前倚靠坐位
D.患侧在上的侧卧位
E.前倾站位
You should have told me there was no meeting today, I _____ have run all the way here through the heavy rain. [ ]
A. can't
B. mustn't
C. shouldn't
D. needn't