流行性脑膜炎的主要死亡原因是()
A.反复惊厥
B.合并肺炎
C.褥疮导致败血症
D.中枢性呼吸衰竭
E.气道痰液梗阻
参考答案:D
代偿性呼吸性酸中毒()
A.pH7.30,PaO26kPa,PaCO210kPa
B.pH7.39,PaO28kPa,PaCO26kPa
C.pH7.25,PaO29kPa,PaCO24kPa
D.pH7.40,PaO28kPa,PaCO29kPa
E.pH7.38,PaO2250mmHg,PaCO240mmHg
In the long run, if price is below average total cost (ATC), the firm will:()
A. shut down.
B. keep running.
C. produce more.