Ptt 大爆卦 | Mask - 前往 https://www.who.int/publications-detail-redirect/advice-on-the-use-of-masks-in-the-community-during-home-care-and-in-healthcare-settings-in-the-context-of-the-novel-coronavirus-(2019-ncov)-outbreak

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Mask use in the context of COVID-19 - WHO | World Health ...

This document provides updated guidance on mask use in health care ... The Annex provides advice on how to manufacture non-medical masks.

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