(来学网)SnF2用于抑制龈下菌斑并能延缓牙周再感染的浓度为
  • A.
    (来学网)0.05%
  • B.
    (来学网)0.12%
  • C.
    (来学网)0.2%
  • D.
    (来学网)1.64%
  • E.
    (来学网)2.5%