активное сечение сита
живое сечение сита
(напр. углеразмольной мельницы на ТЭС)
[А.С.Гольдберг. Англо-русский энергетический словарь. 2006 г.]
Англо-русский словарь нормативно-технической терминологии. academic.ru. 2015.
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