题目内容
胸骨旁大血管短轴切面舒张期可见主动 脉瓣（ ）
2021-10-14
A.关闭，呈“Y”形
B.开放，呈“Y”形
C.关闭，呈“三角形”
D.开放,呈“三角形” -
E.开放，呈“大鱼口状”
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