问题
单项选择题 A1型题
约80％的婴儿，动脉导管解剖上关闭的年龄是（）
A.3d
B.3个月
C.6个月
D.9个月
E.12个月
答案
参考答案：B
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约80％的婴儿，动脉导管解剖上关闭的年龄是（）
A.3d
B.3个月
C.6个月
D.9个月
E.12个月
参考答案：B
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