(单选题,1.0分)患者,男,68岁。慢性呼吸衰竭。血气分析Pa0 2为45mmHg,PaC0 2为70mmHg,为患者吸氧,宜选择的浓度为
A.18%~21% B.42%~46% C.46%~53% D.< 35% E.30%~42%正确答案D
(单选题,1.0分)患者,男,68岁。慢性呼吸衰竭。血气分析Pa0 2为45mmHg,PaC0 2为70mmHg,为患者吸氧,宜选择的浓度为
A.18%~21% B.42%~46% C.46%~53% D.< 35% E.30%~42%正确答案D
