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【单选题】
女，27岁，孕28，来医院进行常规孕检。下列关于羊水的叙述错误的是（）A.
妊娠早期的羊水主要来源于母体血清
B.
妊娠中期以后，母体血清和体液成为羊水的主要来源
C.
羊水具有保护胎儿，保护母体的功能
D.
妊娠38水量约为1000ml，40800ml
E.
妊娠期间羊水超过2000ml即为羊水过多
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