食管癌瘤切除的长度应在距癌瘤上下() ["A．2～4cm","B．3～4cm","C．4～5cm","D．4～8cm","E．5～8cm"]
何谓肺性脑病?如何处理?
食管癌的发生可能与哪种元素的缺乏有间接关系() ["A．砷","B．镍","C．铬","D．镉","E．钼"]
美合作在林县开展的食管癌化学预防试验研究应用的药物是什么() ["A．维生素","B．微量元素","C．中药","D．维生素与微量元素","E．维胺酯"]
干扰电疗时，电极面积＜50cm，其电流密度()干扰电疗时，电极面积＞50cm，其电流密度() ["A．0.1～0.2mA/cm","B．0.3～0.4mA/cm","C．0.5～0.6mA/cm","D．0.6～0.7mA/cm","E．0.8mA/cm"]
全身照射法基本进度末次剂量是()全身照射法加速进度末次剂量是()全身照射法缓慢进度末次剂量是()
