男，59岁，咳嗽，咳痰，痰中带血2月余，CT检查如图，最可能的诊断是() ["A．肺结核","B．中央型肺癌","C．矽肺","D．肺炎","E．肺错构瘤"]
外伤性鼓膜穿孔的处理不正确的是() ["A．清除外耳道内异物或血肿","B．用酒精消毒外耳道及耳廓","C．切勿用力擤鼻","D．用外耳道冲洗或滴药","E．如穿孔长期未愈合行鼓膜修补"]
苯丙酮尿症的生化改变，错误的是（） ["A．苯丙氨酸在血和脑脊液中堆积","B．酪氨酸产生减少","C．甲状腺素、肾上腺素合成增多","D．黑色素合成不足","E．尿中苯乙酸排出增多"]
何谓抗原抗体反应?
具有外耳道奇痒症状的疾病是() ["A．急性外耳道炎","B．慢性化脓性中耳炎","C．外耳道胆脂瘤","D．耵聍栓塞","E．外耳道真菌感染"]
抗原抗体反应有何特点?
