(来学网)角膜表面麻醉,常用丁卡因的浓度是()
  • A.
    (来学网)0.1%
  • B.
    (来学网)0.5%
  • C.
    (来学网)2.0%
  • D.
    (来学网)3.0%
  • E.
    (来学网)4.0%