【单选题】【消耗次数：1】
雏鸡发生脑脊髓炎的主要临床症状是
①
呼吸困难
②
共济失调
③
腹泻
④
高热
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
②
患者感到空气不足，呼吸费力
③
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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