一老年患者气管插管后血压降低至80/50mmHg,最适宜采取的简便措施是()
A.静注多巴胺4mg
B.快速输液
C.静注麻黄碱10mg
D.取头低位
E.输血
参考答案:D
—Maria, what're you going to be when you grow up?
—A _______.I like to help doctors and take care of the sick. [ ]
A. nurse
B. reporter
C. teacher
D. policewoman
连续X射线谱为什么存在短波限λ0?