(来学网)正常成年人胸椎椎管前后径范围为 ( )
  • A.
    (来学网)12~21mm
  • B.
    (来学网)15~25mm
  • C.
    (来学网)8~12mm
  • D.
    (来学网)14~15mm
  • E.
    (来学网)16~27mm