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【单选题】
I 型呼吸衰竭血气诊断标准为A.
PaO2<60mmHg< /div>
B.
PaO2< 80mmHg
C.
PaO2<80mmHg ， PaCO2>50mmHg
D.
PaO2< 60mmHg ， PaCO2>50mmHg
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