假口罩没有熔喷层,就真的一点不能防病毒,所以必须讨论真假
回答: 普通医用口罩的熔喷层还是能防一些病毒的,但是有限,20-30%的样子,远不如KN95和N95,但普通人在日常生活中戴还是可以的,
由 stopthinking
于 2021-02-15 19:38:16
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