(来学网)牙周膜厚度平均为
  • A.
    (来学网)0.15~0.38mm
  • B.
    (来学网)0~2mm
  • C.
    (来学网)0.5~3mm
  • D.
    (来学网)0.21~0.30mm
  • E.
    (来学网)0.18~3mm
正确答案:
A