[KongchangAI]
Unverified82% confidenceDecision RuleTime unknown

日常通勤和普通公共场所,孕妇选医用外科口罩(YY 0469标准)即可,细菌过滤效率≥95%、颗粒过滤≥30%,比KN95呼吸更轻松;仅在医院、疫情高发密闭空间才需升级到KN95/N95

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