题目内容
对于房间隔缺损血流频谱的叙述，不正确 的是
2022-01-25
A.显示为正向揣流频谱
B.应采用CW检测
C.频谱始于收缩中晚期
D.频谱持续全舒张期
E.分流速度在60〜80cm/s以上
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