(来学网)基底部玻璃体位于( )
  • A.
    (来学网)锯齿缘向前约1mm,向后约2mm
  • B.
    (来学网)锯齿缘向前约1mm,向后约4mm
  • C.
    (来学网)锯齿缘向前约2mm,向后约2mm
  • D.
    (来学网)锯齿缘向前约2mm,向后约4mm
  • E.
    (来学网)以上均不对
正确答案:
D