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overlap joint — соединение внахлестку
overlapping" of fractions' boiling points — налегание" температур кипения разделяемых фракций
overlaying formation — вышележащий горизонт
oxidability — окислЯемость, способность окислЯтьсЯ
oxide layer — оксиднаЯ пленка
oxygen plasma — кислороднаЯ плазма