题目内容
继发性下肢深静脉瓣功能不全主荽诊断依 据是( )
2021-10-14
A.下肢深静脉管径变宽
B.静脉辦增厚、残缺或消失
C.管腔内实质性血栓回声
D.彩色血流出现逆转
E.血流频谱出现反向血流
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