心房间隔缺损主要X线征象是（）
A.主动脉结缩小或正常
B.肺门舞蹈征
C.右心房增大
D.左心室增大
E.肺动脉段突出
参考答案：C
枷号
-What's this?
-____________. [ ]
A. No, it's not a ruler
B. It is a pencil sharpener
C. No, it isn't
D. Yes, it is
