File:Количественная проверка изолирующих свойств фильтрующей полумаски с помощью прибора PortaCount.jpg
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![File:Количественная проверка изолирующих свойств фильтрующей полумаски с помощью прибора PortaCount.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/c/c4/%D0%9A%D0%BE%D0%BB%D0%B8%D1%87%D0%B5%D1%81%D1%82%D0%B2%D0%B5%D0%BD%D0%BD%D0%B0%D1%8F_%D0%BF%D1%80%D0%BE%D0%B2%D0%B5%D1%80%D0%BA%D0%B0_%D0%B8%D0%B7%D0%BE%D0%BB%D0%B8%D1%80%D1%83%D1%8E%D1%89%D0%B8%D1%85_%D1%81%D0%B2%D0%BE%D0%B9%D1%81%D1%82%D0%B2_%D1%84%D0%B8%D0%BB%D1%8C%D1%82%D1%80%D1%83%D1%8E%D1%89%D0%B5%D0%B9_%D0%BF%D0%BE%D0%BB%D1%83%D0%BC%D0%B0%D1%81%D0%BA%D0%B8_%D1%81_%D0%BF%D0%BE%D0%BC%D0%BE%D1%89%D1%8C%D1%8E_%D0%BF%D1%80%D0%B8%D0%B1%D0%BE%D1%80%D0%B0_PortaCount.jpg/799px-thumbnail.jpg?20140421152106)
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