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    1056–1065. doi:10.1002/ajim.20395. PMID 17096360. 中华人民共和国医药行业标准:YY 0469–2011 医用外科口罩(Surgical mask) (in Chinese) Strasser BJ, Schlich T (July 2020). "A history...
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    Ratings, and Filtration Effectiveness". Smart Air Filters. "YY 0469-2011 医用外科口罩.pdf". max.book118.com. "YY/T 0969-2013: PDF in English". chinesestandard...
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    Filters. 中华人民共和国医药行业标准:YY 0469–2011 医用外科口罩 (Surgical mask) (in Chinese) 中华人民共和国医药行业标准:YY/T 0969–2013 一次性使用医用口罩 (Single-use medical face mask) Archived...
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    Archived from the original on 25 January 2020. Retrieved 24 January 2020. "市民戴外科口罩 荔枝角收押所外集會「撐手足」". 明報. 24 January 2020. Archived from the original on 25 January...
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