A <p>PaCO<sub>2</sub>正常,PaO<sub>2</sub><60mmHg</p> B <p>PaCO<sub>2</sub><30mmHg,PaO<sub>2</sub><80mmHg</p> C <p>PaCO<sub>2</sub>>50mmHg,PaO<sub>2</sub><60mmHg</p> D <p>PaCO<sub>2</sub><50mmHg,PaO<sub>2</sub>>60mmHg</p> E <p>PaCO<sub>2</sub>>50mmHg,PaO<sub>2</sub><80mmHg</p>