第19题: [单项选择]嘧啶核苷酸补救途径的主要酶是 A. 嘧啶磷酸核糖转移酶 B. 氨基甲酰磷酸合成酶 C. 胞苷激酶 D. 二磷酸核苷激酶 E. 乳清酸脱氢酶 参考答案:A
第20题: [单项选择]Charcot三联征发生的顺序是 A. 黄疸,寒战、高热,腹痛 B. 腹痛,寒战、高热,黄疸 C. 寒战、高热,黄疸,腹痛 D. 黄疸,腹痛,寒战、高热 E. 腹痛,黄疸,寒战、高热 参考答案:B 答案解析:当结石阻塞胆管并继发感染时可致典型的胆管炎症状:急腹痛、寒战高热和黄疸,称为Charcot三联征。结石嵌顿于胆总管下端或壶腹部,刺激胆管平滑肌,引起Oddi括约肌痉挛,患者出现腹痛;剧烈腹痛后,出现寒
第30题: [单项选择]{{B}}Questions 11 to 18 are based on the conversation you have just heard.{{/B}} A. It left a few minutes ago. B. They don’t have to rush for it. C. He’d rather take a later one. D. He thinks it has been delayed again 参考答案:B 答案解析:[听力原文]
W: Let’s hurry and get on the bus.
M: What for It isn’t scheduled to leave for another 10