小孔室缺的血流动力学改变正确的是() ["A．左向右分流量小","B．缺损孔直径9～15mm","C．肺动脉与右心室压力正常或稍高","D．右心房无分流故不增大","E．右心室没有容量的过负荷故无明显增大"]
房间隔缺损在左、右前斜位可见的X线征象有() ["A．肺动脉段隆起","B．心前间隙缩小","C．左心房不大","D．右心室段延长或隆起","E．心前缘与胸骨接触面增加"]
X线检查，室间隔缺损可表现为() ["A．低位小缺损，胸片可正常","B．高位大缺损，肺血常增多","C．右心房常增大","D．可有肺门舞蹈","E．左心房常增大"]
“继发孔型房间隔缺损”分为哪几型() ["A．中央型/卵圆窝型","B．上腔型","C．下腔型","D．周边型","E．混合型"]
试述营养性巨幼细胞贫血的发病机制?
试述营养性巨幼细胞贫血的血象特点?
