单项选择题

I型呼吸衰竭时()

A.PaO>60mmHg,PaCO>50mmHg
B.PaO>80mmHg,PaCO>50mmHg
C.PaO<80mmHg,PaCO<50mmHg
D.PaO<60mmHg,PaCO>50mmHg
E.PaO>60mmHg,PaCO<50mmHg