A . A.PaO2≤8kPa(60mmHg),PaCO2≥6kPa(45mmHg),SaO2<90%
B . B.PaO2≤8kPa(60mmHg),PaCO2≥6.7kPa(50mmHg),SaO2<90%
C . C.PaO2≤6.7kPa(50mmHg),PaCO2≥6.7kPa(50mmHg),SaO2<85%
D . D.PaO2≤6.7kPa(50mmHg),PaCO≥8kPa(60mmHg),SaO2<85%
E . E.PaO2≤6.7kPa50mmHg),PaCO2≥6.7kPa(50mmHg),SaO2<90%
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