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