题目内容
关于脐带，正确的是
2021-10-12
A.足月妊娠胳带长度平均60〜70on
B.脐带长度<20on为脐带过短
C.脐带长度>90cm为脐带过长
D.脐带表面被绒毛膜覆盖
E.脐带缠绕以缠绕胎儿颈部居多
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