关于妊娠对心脏病的影响,下列描述正确的是
A.循环血量于妊娠32~34周达高峰
B.循环血量于妊娠10周开始增加
C.循环血量比非孕期增加约50%
D.妊娠晚期心脏向右移位增加了心脏负担
正确答案是A
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