[单选题]

呼吸衰竭的动脉血气诊断标准是

A.PaO<50mmHg和(或)PaCO>50mmHg

B.PaO<50mmHg和(或)PaCO>60mmHg

C.PaO<60mmHg和(或)PaCO>50mmHg

D.PaO<60mmHg和(或)PaCO>80mmHg

E.PaO<70mmHg和(或)PaCO>50mmHg

参考答案与解析: