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【单选题】
妊娠期母体循环变化正确的是( )A.
心脏容量从妊娠早期至孕末期约增加15%
B.
心搏出量约自妊娠10开始增加,至临产期达高峰
C.
血容量增加血浆高于红细胞,使血液稀释,出现生理性贫血
D.
妊娠期心率每分钟增加约5~10次
E.
右旋增大的子宫压迫下腔静脉产妇易发生心衰
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