【单选题】【消耗次数：1】
1958年，Heath和Edwards根据肺血管病变发生顺序，将其分为
①
4级
②
5级
③
6级
④
7级
⑤
8级
参考答案：
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右心声学造影，左心房内见20个微泡，用4级和5级定量方法，分别属于 （ ）
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