(来学网)正常视神经乳头的直径为:
  • A.
    (来学网)0.5mm
  • B.
    (来学网)1mm
  • C.
    (来学网)1.5mm
  • D.
    (来学网)2mm
  • E.
    (来学网)2.5mm
正确答案:
C