(来学网)发绀是皮肤和黏膜的毛细血管内还原血红蛋白浓度绝对值超过
  • A.
    (来学网)10g/L
  • B.
    (来学网)20g/L
  • C.
    (来学网)50g/L
  • D.
    (来学网)100g/L
  • E.
    (来学网)200g/L