A.PaO2为75mmHg,PaCO2为45mmHgB.PaO2为70mmHg,PaCO2为40mmHgC.PaO2为65mmHg,PaCO2为40mmHgD.PaO2为55mmHg,PaCO2为50mmHgE.PaO2为50mmHg,PaCO2为45mmHg