单项选择题

A.PaO2<65mmHg和(或)伴有PaCO2>55mmHg
B.PaO2<50mmHg和(或)伴有PaCO2>60mmHg
C.PaO2<60mmHg和(或)伴有PaCO2>5mmHg
D.PaO2<60mmHg和(或)伴有PaCO2>50mmHg
E.PaO2<65mmHg和(或)伴有PaCO2>50mmHg