醫療＋布口罩較能阻病毒？陳時中：能換氣戴幾層都可 | 聯合新聞網：最懂你的新聞網站
美國疾管局（CDC）發布報告指出醫療口罩多載一層布口罩，能有效阻絕9成以上的病毒傳播，中央流行疫情指揮中心專家諮詢小組召...
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