underflow underfold underframe under-frequency protection underglaze undergrade crossing undergrate blast undergrate blower undergroud railway underground underground antenna underground bailiff underground boring underground cable underground combustion underground conduit underground contact rail underground crossing underground crusher underground environment |
underflow изч. отрицателно препълване обог. сгъстен продукт поток на дъното на водохранилище подземно течение Търсената дума е намерена |