有关食管癌的放射治疗,以下哪种情况应列为禁忌症() ["食管癌病变长度12cm","病变上方食管高度扩张","食管壁有窄而深的溃疡","食管壁明显增厚","合并隆突下淋巴结肿大"]
食管癌切除术后出现乳糜胸多发生在() ["术后2~10日","术后5~15日","术后10~25日","术后15~30日","术后30~45日"]
食管癌病人胸腔闭式引流出现大量淡黄色液体,考虑() ["胸腔感染","食管吻合口瘘","胸腔活动性出血","乳糜胸","肺不张"]
食管癌主要诊断方法是() ["气管镜","纤维食管镜","B超","食管钡餐X线检查","食管拉网脱落细胞检查"]
某楼层为钢筋混凝土梁板结构,单向板支撑在梁上。单向板的跨度为3m,装修时,楼板上铺了40mm厚素混凝土。
请简要论述安全技术防范的业务与管理。