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並前往https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7224694/

SARS-CoV-2 (COVID-19) by the numbers - PMC - NCBI

SARS-CoV-2 is an enveloped virus ≈0.1 μm in diameter, so N95 masks are ... nuclei produced by coughing is on the order of ~1 μm (Yang et al., 2007).

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