鉴别急性与慢性呼吸衰竭,哪项是正确的()
A.有无发绀
B.有无缺氧及二氧化碳潴留
C.起病缓急
D.有无肺气肿
E.有无呼吸困难
参考答案:C
40. —Good evening. Huangshan Hotel.
—Good evening. ______________?
A.Do you still have a room for tonight
B.What would you like, please
C.Is there anything I can do for you
D.Who is that speaking, please
诊断试验的评价原则包括()
A.必须将诊断试验与金标准进行比较研究
B.研究对象应具有代表性
C.有足够的样本含量
D.有合理可靠的临界值
E.介绍研究方法应明确、具体