A . A.PaO2<8.6kPa(65mmHg)和(或)伴有PaCO2>7.3kPa(55mmHg)
B . B.PaO2<6.7kPa(50mmHg)和(或)伴有PaCO2>8.0kPa(60mmHg)
C . C.PaO2<8.0kPa(60mmHg)和(或)伴有PaCO2>7.3kPa(55mmHg)
D . D.PaO2<8.0kPa(60mmHg)和(或)伴有PaCO2>6.7kPa(50mmHg)
E . E.PaCO2<8.6kPa(65mmHg)和(或)伴有PaCO26.7kPa(50mmHg)
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