【单选题】【消耗次数：1】
下列哪项不是呼吸困难的体征
①
鼻翼翕动
②
三角架姿势
③
呼吸性哮鸣
④
口唇青紫
参考答案：
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呼吸困难是指
①
剧烈运动时感到的一种气不够用的感觉
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患者感到空气不足，呼吸费力
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因气道狭窄而引起的气体吸入和呼出困难
④
因肺泡气体交换障碍引起的一种缺氧表现
⑤
因血含氧量降低引起的一种表现
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