(来学网)CT检查颈部椎管,一般认为椎管狭窄的前后径应小于
  • A.
    (来学网)10mm
  • B.
    (来学网)12mm
  • C.
    (来学网)14mm
  • D.
    (来学网)16mm
  • E.
    (来学网)18mm