严重肝病时氨清除不足的原因主要是() ["A．尿素合成障碍","B．谷氨酰胺合成障碍","C．谷氨酸合成障碍","D．5-羟色胺合成障碍","E．γ-氨基丁酸合成障碍"]
房室传导阻滞(AVblock)
X线表现为粗大树枝样阴影，尖端指向肺门，应考虑() ["A．肺气肿","B．肺不张","C．黏液嵌塞征","D．阻塞性肺炎","E．肺门区及纵隔肿块"]
阿托品的禁忌证是() ["A．感染性休克","B．胃肠绞痛","C．前列腺肥大","D．胆绞痛","E．心动过缓"]
无青紫型先心病
R-on-T现象
