【单选题】【消耗次数：1】
指南推荐心脏长轴应变的正常值为：
①
≥20%
②
≥10%
③
≥-20%的绝对值
④
＜-10%
⑤
＜20%
参考答案：
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相关题目
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10GE仍然保留了802.3标准对Ethernet最小帧长度和最大帧长度的规定。
②
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mso-bidi-font-size:11.0pt;
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铅垂线
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