短語詞組短語Base tangent length G 公法線長度control tangent length 控制切線長Free tangent length method 任意切線長支距法base tangent length deviation 公法線偏差Base tangent length 公法線長度tangent length west bank 切線長度Length tangent 切線長度tangent vector with constant length 定長切向量tangent plane arc -length method 切面弧長法 返回 tangent length