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1. www.webmd.com › covid › coronavirus-face-masksFace Mask for Coronavirus: Types, Best Filters, How to Make ...

   www.webmd.com › covid › coronavirus-face-masks

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   2023年11月30日 · How to Wear a Face Mask. Wash your hands with soap and water for at least 20 seconds. Make sure the mask has no holes. Secure the mask with ties behind your head. If it has loops, pull them behind ...