单选题:下列哪项是前置胎盘的典型表现( )

题目内容:
下列哪项是前置胎盘的典型表现( ) A.妊娠期因外伤后出现持续性腹痛,伴有阴道流血
B.血压升高
C.血压下降、贫血
D.胎儿宫内窘迫
E.妊娠期或临产时,无痛性无诱因反复阴道流血
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