Ключевые слова: barrel, building, chemical, chimney, color, concept, construction, crude, design, distillery, element, energy, environment, factory, fuel, gas, gasoline, icon, illustration, industrial, industry, isolated, line, linear, oil, outline, petrol, petroleum, pipe, plant, pollution, power, production, pump, refinery, sign, simple, station, storage, stroke, structure, symbol, tank, technology, thin, water, web, white,