эталонная измерительная частота
эталонная испытательная частота
—
[Л.Г.Суменко. Англо-русский словарь по информационным технологиям. М.: ГП ЦНИИС, 2003.]
Англо-русский словарь нормативно-технической терминологии. academic.ru. 2015.
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