单选题
编号：1535013
1.Ⅱ型呼吸衰竭是指
- A.PaO
<50mmHg - B.PaO>50mmHg
- C.PaO>50mmHg
- D.PaO>50mmHg
- E.PaO<50mmHg
<50mmHg>50mmHg>50mmHg>50mmHg<50mmHg