诊断呼吸衰竭的血气标准是A、PaO<65mmHg和(或)伴有PaCO>55mmHgB、PaO<50mmHg和(或)伴有PaCO>60mmHg

诊断呼吸衰竭的血气标准是

A．PaO＜65mmHg和（或）伴有PaCO＞55mmHg

B．PaO＜50mmHg和（或）伴有PaCO＞60mmHg

C．PaO＜60mmHg和（或）伴有PaCO＞55mmHg

D．PaO＜60mmHg和（或）伴有PaCO＞50mmHg

E．PaO＜65mmHg和（或）伴有PaCO＞50mmHg