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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

This document focuses on N95 disposable respirators, surgical masks, ... NIOSH certification mask filtration efficiency for particles ≥ 0.3 μm.

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