Ключевые слова: background, bolt, chemical, connection, construction, control, energy, engineering, equipment, faucet, fuel, gas, gasoline, heat, image, industrial, industry, iron, isolated, machine, metal, natural, oil, pipe, pipeline, piping, plant, power, pressure, production, pump, refinery, screw, station, steel, stock, supply, system, technology, transportation, tube, valve, yellow,