肺动脉狭窄的X线表现有() ["A．心脏大小正常或轻度增大","B．肺动脉段明显突向前上方","C．右肺门大于左肺门","D．主动脉结正常","E．肺血较少"]
白血病的临床特点有哪些?
先天性主动脉缩窄的X线表现为() ["A．肋骨切迹","B．3字征","C．升主动脉扩张","D．上纵隔阴影增宽","E．降主动脉上段的狭窄后扩张"]
大剂量丙种球蛋白治疗特发性血小板减少性紫癜的主要作用原理?
典型的二尖瓣关闭不全患者的X线表现有() ["A．左心房和左心室增大为主","B．伴有右心室增大","C．左心房呈中度到重度增大","D．肺淤血","E．病变晚期可见明显的肺循环高压"]
简述白血病的可能病因?
