题目内容
下列指标中,提示胎盘功能低下的是
2022-01-18
A.胎动<10次/12小时
B.妊娠足月血清游离E3<40nmol/L
C.血清人胎盘生乳素<4mg/L
D.血清人胎盘生乳素较前突然下降50%
E.以上都是
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