题目内容
关于脐带的描述，错误的是
2021-10-12
A.胳带长于70cm或短于30cm属异常
B.若脐带附着于胎膜上，为帆状胎盘
C.脐动脉的含氧量髙于脐静脉
D.单胳动脉常合并胎儿或胎盘异常
E.脐带先露也称脐带隐性脱垂
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