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並前往https://www.mckinsey.com/~/media/mckinsey/about%20us/covid%20response%20center/pdfs/covid-19-ppe-ops-airway-protection.pdf

COVID-19 airway protection PPE overview - McKinsey

ASTM surgical mask standards (Level 1, 2, and 3) are referenced by FDA; not all FDA cleared surgical masks comply ... ASTM Level 1 1 ... with melt blown.

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