关于肺隔离症的描述，下列哪项正确() ["A．右侧比左侧常见","B．与支气管树相通较常见","C．如发生于叶内，通常见于婴儿","D．上叶与下叶的发生率相等","E．绝大多数血供来自腹主动脉"]
试述使用洋地黄类药物治疗小儿心力衰竭时的原则及其用法?
慢性支气管炎早期X线表现为() ["A．肺纹理改变","B．肺气肿征象","C．肺动脉高压征象","D．肺部炎症","E．气管剑鞘状改变"]
正常胎儿血液循环如图，简述正常胎儿血液循环途径?
动脉血压升高可导致() ["A．心房收缩期延长","B．心室舒张期延长","C．心室射血相延长","D．等容收缩相延长","E．心室收缩期延长"]
动力型肺动脉高压和梗阻型肺动脉高压病理有何不同?
