Unverified85% confidenceDecision RuleTime unknown
带气道开放模拟的模型需具备'仰头抬颏后气道通畅、未正确开放则吹气受阻'的物理机制，胸廓可见起伏；无气道阻塞反馈的低端模型会让学员误以为随意吹气即有效
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