Scientific common sense about masks（2）4. Is it necessary to use medical protective masks to protect against viruses? What is the difference between medical N95 and N95 protective masks?Medical protective masks are protective masks designed to protect medical workers in a specific medical environment
MaskMasks are a kind of sanitary products, which are generally worn on the mouth and nose to filter the air entering the mouth and nose to block harmful gases, odors, droplets, viruses and other substances. They are made of gauze or paper. Masks have a certain filtering effect on the air entering th
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