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【单选题】
小儿呼吸衰竭的诊断标准是( )。
A.
PaO2≤50mmHg，PaO2≥50mmHg， SaO2＜85%
B.
PaO2≤60mmHg，PaO2≥45mmHg， SaO2＜91%
C.
PaO2≤50mmHg，PaO2≥60mmHg， SaO2＜85%
D.
PaO2≤50mmHg，PaO2≥50mmHg， SaO2＜91%
E.
PaO2≤50mmHg，PaO2≥0mmHg， SaO2＜95%
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