患者40余岁，男性，体重减轻，乏力，最可能的诊断为() ["A．淋巴瘤","B．精原细胞瘤","C．结核","D．血管曲张","E．以上都不是"]
中、重度食管腐蚀伤在第3周时，吞咽困难和吞咽疼痛好转，这表示() ["A．食管腐蚀伤已进入缓解期","B．食管粘膜及肌层都开始愈合","C．食管肌层已经愈合","D．食管腐蚀伤已进入瘢痕狭窄期","E．食管腐蚀伤已经痊愈"]
结核性脑膜炎早期包括以下哪组症状体征() ["A．持续头痛、低热、嗜唾","B．食欲减退、便秘，呕吐","C．性情改变、易哭、易怒","D．颈项强直，频繁惊厥","E．肢体瘫痪或偏瘫"]
食管腐蚀伤后4周出现吞咽困难逐渐加重，可认为是() ["A．食管腐蚀伤进入缓解期","B．食管异物","C．残留的腐蚀剂进一步破坏食管壁","D．食管腐蚀伤进入瘢痕狭窄期","E．食管腐蚀伤后并发食管炎症"]
患者60多岁，男性，胸部不适加重，最可能的诊断为() ["A．食管癌","B．肺癌","C．主动脉瘤破裂","D．淋巴瘤","E．以上都不是"]
99m锝(
)有哪些重要特性?
