A . A.<33mm,3段,各段B . B.33~55mm,4段,球壁、眶内段C . C.33~55mm,4段,球壁、眶内、管内段D . D.55mm,4段,球壁、眶内、颅内段E . E.60mm,4段,球壁、眶内、颅内段
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