FFP是欧洲标准。FFP2相当于美国的N95级别，可过滤95%的飘浮物。FFP3可以过滤99%

来源: 疏影浅斜于 2021-02-15 13:18:48 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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