【单选题】【消耗次数：1】
法洛四联症患儿病理生理改变主要取决于
①
肺动脉狭窄程度
②
主动脉骑跨程度
③
右心室肥厚程度
④
血液粘滞度
⑤
患儿年龄
参考答案：
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求圆柱螺线x=acost,y=asint,z=bt的曲率和挠率