【单选题】【消耗次数：1】
心胸比率是指
①
心脏最大横径与胸廓最大横径之比
②
正常成人心胸比率<0.52
③
胸廓横径是指通过左侧膈顶的两侧肋骨外缘之间的水平距离
④
心脏横径是指自心脏右缘和左缘最凸出点连线长度
⑤
正常人心胸比率在0.3-0.55之间
参考答案：
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