(来学网)当血氧饱和度低于多少时,即可出现紫绀
  • A.
    (来学网)50%
  • B.
    (来学网)60%
  • C.
    (来学网)70%
  • D.
    (来学网)90%
  • E.
    (来学网)85%
正确答案:
D