(来学网)局部涂氟所用氟化钠溶液的浓度为
  • A.
    (来学网)2%
  • B.
    (来学网)1.5%
  • C.
    (来学网)5%
  • D.
    (来学网)8%
  • E.
    (来学网)0.5%
正确答案:
A