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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
C.
妊娠期羊水量保持稳定，约500ml
D.
脐带中有2条静脉和1条动脉
E.
母儿之间的气体交换，主要通过胎膜
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【单选题】What may happen to computer criminals once they are caught? 查看材料
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once majored in computer science
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