(来学网)男,48岁。慢性呼吸衰竭。血气分析PaO2为50mmHg,PaCO2为65mmHg,为患者吸氧,宜选择的浓度为
  • A.
    (来学网)18%~24%
  • B.
    (来学网)<35%
  • C.
    (来学网)30%~42%
  • D.
    (来学网)42%~46%
  • E.
    (来学网)46%~53%