单项选择题

A.PaO<sub>2</sub>为50 mmHg,PaCO<sub>2</sub>为40 mmHg
B.PaO<sub>2</sub>为55 mmHg,PaCO<sub>2</sub>为50 mmHg
C.PaO<sub>2</sub>为65 mmHg,PaCO<sub>2</sub>为40 mmHg
D.PaO<sub>2</sub>为70 mmHg,PaCO<sub>2</sub>为40 mmHg
E.PaO<sub>2</sub>为70 mmHg,PaCO<sub>2</sub>为45 mmHg