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【单选题】
关于胎儿附属物,以下各项正确的是
A.
胎盘有防御感染的功能，乙肝病毒不能通过胎盘
B.
胎盘有合成雌激素、孕激素的功能 prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
C.
妊娠期羊水量保持稳定，约 500ml 左右
D.
脐带中有 2 条脐静脉和 1 条脐动脉
E.
母 儿之间的气体交换，主要通过胎膜 prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
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