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单项选择题

小儿呼吸衰竭的诊断标准是

A.PaO 2 ≤50mmHg,PaCO 2 ≥50mmHg,SaO 2 <85%
B.PaO 2 ≤60mmHg,PaCO 2 ≥45mmHg,SaO 2 <91%
C.PaO 2 ≤50mmHg,PaCO 2 ≥60mmHg,SaO 2 <85%
D.PaO 2 ≤50mmHg,PaCO 2 ≥50mmHg,SaO 2 <91%
E.PaO 2 ≤50mmHg,PaCO 2 ≥30mmHg,SaO 2 <95%