low-frequency furnace low-frequency generator low-frequency resistance low-frequency stage low-frequency waves low-gain low gear low-grade low-grade cement low-grade fuel low-grade material low grade oil low gradient low-gravity low-head low-head hydroelectric station low-heat cement low-hydrogen electrode low-impedance triode low insulation |
low-frequency furnace нискочестотна пещ Търсената дума е намерена |