(来学网)根据PaO2确定缺氧程度,重度缺氧时PaO2可小于
  • A.
    (来学网)50mmHg
  • B.
    (来学网)45mmHg
  • C.
    (来学网)40mmHg
  • D.
    (来学网)35mmHg
  • E.
    (来学网)30mmHg