小儿呼吸衰竭的诊断标准是()
A.PaO≤8kPa(60mmHg)PaCO≥6kPa(45mmHg)SaO<90% B.PaO≤8kPa(60mmHg)PaCO≥67kPa(50mmHg)SaO<90% C.PaO≤67kPa(50mmHg)PaCO≥67kPa(50mmHg)SaO<85% D.PaO≤67kPa(50mmHg)PaCO≥8kPa(60mmHg)SaO<85% E.PaO≤67kPa50mmHg)PaCO≥67kPa(50mmHg)SaO<90%正确答案C