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並前往https://www.coronavirus.kdheks.gov/DocumentCenter/View/1416/Understanding-ASTM-Levels-for-Facemasks-PDF---7-30-20

Understanding ASTM Levels for Facemasks

The U.S. Food and Drug. Administration (FDA) maintains a list of recognized standards, in which ASTM standards are included. ASTM F2100. The ...

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