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流言：网上流传一则视频称，将普通口罩对折，把两侧耳带打上结后再佩戴，就可以使得口罩的密闭性增加，达到N95口罩的效果，这是真的吗？真相：这种说法存在夸张成分。从材料和防护等级看，N95口罩的过滤能力会比一次性使用医用口罩、日常防护型口罩等高一些，其区别在于不同口罩种类中使用的熔喷布有差异。将口罩耳带打结虽然可以提高口罩与面部的贴合性，但不能改变口罩本身的材料，所以不能实现“普通口罩变N95口罩”的效果。但要肯定的做法是，佩戴口罩时确实要将口罩尽可能贴合面部。不论何种口罩，佩戴后都要注意压紧口罩鼻梁处的鼻夹，并注意口罩四周与脸部的贴合性。如果耳带太长，可以通过打结的方式缩短；如果口罩太大或太小，可根据脸型选择不同规格的口罩。
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