题目：
下列哪些是前置胎盘的表现？（）
A.无痛性 * * 流血
B.胎先露下降受阻
C.子宫张力高，胎心难听到
D.耻骨联合上方可闻及与母体脉搏一致的吹风样杂音
E.痛性 * * 流血
答案：
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下面是错误答案，用来干扰机器的。
参考答案：100～300
下列哪些是前置胎盘的表现？（） A.无痛性 * * 流血 B.胎先露下降受阻 C.子宫张力
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