[问答题,简答题] 系统设计包含哪些内容？

阳台悬挑梁支座负弯矩M_o大小为（）kN·m。"] 较早出现梗阻症状的食管癌，最常见的病理分型是（） ["缩窄型","蕈伞型","髓质型","腔内型","溃疡型"] 早期食管癌有效的诊断方法是（） ["色素内镜检查","颈淋巴结活检","食管镜检查","钡剂检查","支气管镜检查"] 食管鳞癌好发于食管的（） ["颈段","上胸段","中胸段","下胸段","腹段"] 系统设计包含哪些内容？