(来学网)对ASAⅠ级病人在行NO+O吸入全身麻醉时,吸入气中氧浓度至少应为
  • A.
    (来学网)0.45
  • B.
    (来学网)0.4
  • C.
    (来学网)0.35
  • D.
    (来学网)0.25
  • E.
    (来学网)0.2