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新型冠状病毒防控指引18讲（一）口罩，你戴对了吗？
新冠疫情防控期间，去超市应该戴哪种口罩？坐公共交通需要戴哪种口罩？不同职业的人群该如何选择口罩？口罩中防病毒最重要的部分究竟是什么？如何选择正确有效的口罩？
防疫小知识27/76
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