Objective To evaluate the filtration efficiency of different types of mask filtration materials against non-biological particles aerosol and microbial aerosol.
目的评价不同类型口罩滤材对非生物颗粒气溶胶和微生物气溶胶过滤效率。
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Use ea can of water-soluble, non-toxic aerosol paint to write a message of love on the grass in your yard.