A.PaO2≤8kPa(60mmHg),PaCO2≥6kPa(45mmHg),SaO2<90% B.PaO2≤8kPa(60mmHg),PaCO2≥6.7kPa(50mmHg),SaO2<90% C.PaO2≤6.7kPa(50mmHg),PaCO2≥6.7kPa(50mmHg),SaO2<85% D.PaO2≤6.7kPa(50mmHg),PaCO2≥8kPa(60mmHg),SaO2<85% E.PaO2≤6.7kPa50mmHg),PaCO2≥6.7kPa(50mmHg),SaO2<90% F.PO2降低、PCO2升高、pH正常