A . PaO2<65mmHg和(或)伴有PaCO2>55mmHgB . PaO2<50mmHg和(或)伴有PaCO2>60mmHgC . PaO2<60mmHg和(或)伴有PaCO2>5mmHgD . PaO2<60mmHg和(或)伴有PaCO2>50mmHgE . PaO2<65mmHg和(或)伴有PaCO2>50mmHg
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