(来学网)当鼻咽癌放疗到3600~4000cGy缩野时,一般上界、前界不动,后界一般到
  • A.
    (来学网)椎体中后1/3处
  • B.
    (来学网)椎体后缘1cm
  • C.
    (来学网)棘突后缘
  • D.
    (来学网)棘突后缘0.5cm
  • E.
    (来学网)椎体前缘