【单选题】【消耗次数：1】
ABC步骤正确的是（ ）。①畅通呼吸道；②人工循环；③人工呼吸
①
①-③-②
②
②-③-①
③
①-②-③
④
③-②-①
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关于呼吸道异物，以下说法不正确的是：
①
呼吸道异物多发生在进食的过程中，食物误入气道而致梗阻
②
常表现为进食突然中止，正在进行的谈话中断
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面色由红变紫，甚至呼吸困难，经过一阵呛咳后，梗阻便可排除
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