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Research on the relationship between architectural features in northeast China and vertical aerosol transmission of COVID-19

 qwewbkybcih06
During the COVID-19 pandemic. many buildings in northeast China have had clusters of infected cases in the vertical layout. There is speculation that vertical aerosol transmission occurs. The houses in northeast China are airtight. https://danddcollectiblers.shop/product-category/socks/
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