(来学网)氟化钠溶液每天含漱一次的氟浓度应为()
  • A.
    (来学网)0.5%
  • B.
    (来学网)0.2%
  • C.
    (来学网)0.1%
  • D.
    (来学网)0.05%
  • E.
    (来学网)0.02%
正确答案:
D