(来学网)血中还原血红蛋白至少达多少时,皮肤黏膜可出现发绀
  • A.
    (来学网)>70g/L
  • B.
    (来学网)>65g/L
  • C.
    (来学网)>60g/L
  • D.
    (来学网)>55g/L
  • E.
    (来学网)>50g/L