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当前学科:儿科住院医师综合练习
题目:
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法洛四联症阵发性缺氧发作是由于()
A . 心脏负荷增加
B . 右向左分流量增加
C . 体循环血流量不足
D . 静脉回心血量减少
E . 肺动脉漏斗部肌部痉挛
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