Ptt 大爆卦 | Medical Face Mask - 前往 https://www.fda.gov/medical-devices/coronavirus-covid-19-and-medical-devices/face-masks-barrier-face-coverings-surgical-masks-and-respirators-covid-19

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並前往https://www.fda.gov/medical-devices/coronavirus-covid-19-and-medical-devices/face-masks-barrier-face-coverings-surgical-masks-and-respirators-covid-19

Face Masks, Barrier Face Coverings, Surgical Masks ... - FDA

Surgical masks : A mask intended for medical purposes that covers the user's nose and mouth and provides a physical barrier to fluids and particulate materials.

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