答案:D
下列哪项不是法洛四联症的畸形组成:()
A.室间隔缺损
B.肺动脉狭窄
C.房间隔缺损
D.主动脉骑跨
E.右心室肥厚
读一读,算一算,填“>”、“<”或“=”。
1. ten -nine ___________ two -one
2. nine + seven ___________ six × three
3. six + five ___________ one + nine