(来学网)水氟浓度在多少时,患龋率和龋均最低,氟牙症发生率也较低
  • A.
    (来学网)0.2~0.4
  • B.
    (来学网)0.4~0.6
  • C.
    (来学网)0.6~0.8
  • D.
    (来学网)0.8~1.0
  • E.
    (来学网)1.0~1.2
正确答案:
C