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【单选题】
选出正确的一项
A.
胎盘合体细胞产生大量硫酸脱氢表雄酮(DHAS)经母体肝脏合成雌三醇再由母体尿中排出
B.
胎儿肾上腺产生大量硫酸脱氢表雄酮(DHAS)经胎儿肝脏后至胎盘转化成雌三醇再由母体尿中排出
C.
胎儿肾上腺产生大量雌三酮,经胎盘由母体尿中排出
D.
妊娠期间孕妇尿中所含的雌激素主要是雌二酮
E.
雌三醇由垂体分泌,而由尿中排出
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