[KongchangAI]
Unverified85% confidenceDecision RuleTime unknown

单向阀(鸭嘴阀/鱼嘴阀)密封性是核心:选带独立进气阀+出气阀的双阀结构,可防止患者呼出气体回流至救护者,降低交叉感染风险;单阀结构不具备防回流功能

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