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2020-9-4 · Mask standards can be confusing: N95, KN95, FFP1, P2, or surgical mask? This quick run-down covers mask types, mask ratings, and their effectiveness at filtering particles. First off, let’s start with mask types (or certification types). In general, there are 3 (or sometimes 4) types of commonly used, disposable masks.
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2020-8-15 · Effectiveness of N95 respirators versus surgical masks in protecting health care workers from acute respiratory infection: a systematic review and meta-analysis www.ncbi.nlm.nih.gov 如果喜欢我，可以关注知乎专栏或个人公众号「听医生说」 编辑于 02-12 504 条 ...
2020-8-13 · Surgical Masks. A surgical mask is a loose-fitting, disposable device that creates a physical barrier between the mouth and nose of the wearer and potential contaminants in …
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