男，4岁。下肢弛缓性瘫痪，膈肌、肋间肌瘫痪，腱反射消失，呼吸浅速，声音低微，咳嗽无力，确诊为脊髓灰质炎。主要的病变部位在() ["A．延髓加脊髓腰段","B．脊髓胸腰段","C．脊髓颈胸腰段","D．脊髓颈腰段","E．胸椎"]
不具有换气功能的解剖结构是() ["A．呼吸性细支气管","B．小叶细支气管","C．肺泡管","D．肺泡囊","E．肺泡"]
男，4岁。下肢弛缓性瘫痪，膈肌、肋间肌瘫痪，腱反射消失，呼吸浅速，声音低微，咳嗽无力，确诊为脊髓灰质炎。该病人为脊髓灰质炎的哪型() ["A．脊髓型","B．延髓型","C．脑干型","D．脊髓延髓型","E．混合型"]
较易引起肺癌的尘肺是() ["A．矽肺","B．石棉肺","C．煤尘肺","D．铁矽肺","E．有机尘肺"]
女，5岁。因发热、稀便4天后，昨晚发现右下肢不能行走。体温38℃，神志清，双下肢肌力右Ⅱ级，左Ⅰ级，跟腱反射未引出，病理反射阴性，双下肢痛觉存在。为确诊应做的首要检查是() ["A．血常规十血沉","B．脑脊液","C．血PH及血钾测定","D．尿抗原测定","E．粪病原检测及血清特异性抗体"]
配制PH=5．0的缓冲溶液，应选择哪一种缓冲剂?缓冲对的用量比率是多少?
