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【单选题】
符合正常脐带生长特征的是A.
脐带由胚胎发育过程中的体蒂发展而来
B.
脐带内有2条脐静脉和1条脐动脉
C.
妊娠足月胎儿脐带平均长约80cm
D.
妊娠足月胎儿脐带直径约0．5cm
E.
脐带表面被羊膜覆盖呈无色透明状
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