题目内容
肺动脉瓣口血流多普勒频谱特征是
2022-01-25
A.舒张期出现，双峰形状，正向
B.收缩中期出现，负向，尖峰形状
C.收缩期为正向，舒张期为负向，尖峰 形状
D.收缩期正向、双峰，舒张期负向、波 峰圆钝
E.持续全收缩期，负向，尖峰形状
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