一般不引起右心房增大的是() ["A．心肌病","B．风湿性心脏病，左房室瓣狭窄","C．先天性心脏病，房间隔缺损","D．风湿性心脏病，左房室瓣关闭不全","E．以上都是"] 患儿血清铁蛋白降低，红细胞游离原卟啉增高，未出现贫血表现，此为哪个阶段表现() ["A．铁减少期","B．红细胞生成缺铁期","C．缺铁性贫血期","D．缺铁性贫血恢复期","E．缺铁性贫血已治愈"] 心包积液在少于多少毫升时，其心影大小和形态可无明显改变() ["A．30ml","B．50ml","C．300ml","D．500ml","E．800ml"] 下列胸片所见，哪项与法洛四联征无关() ["A．漏斗征","B．心腰凹陷","C．肺血减少","D．肺门影增大","E．心尖圆钝，微上翘"] 法洛四联征患者的心影，多数() ["A．明显增大","B．缩小","C．进行性增大","D．雪人征","E．正常或轻度增大"] 正常成人右下肺动脉主干直径一般为()