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1. Model proposed by the Friedlander, correlating the air filtration efficiency by impaction can be expressed as (where NSt is the Stokes number)
(A): ηimp = 0.025NSt1.2
(B): ηimp = 0.075NSt1.2
(C): ηimp = 0.25NSt1.2
(D): ηimp = 0.75NSt1.2
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