Ключевые слова: art, barrel, black, container, crude, currency, design, diagram, distribution, dollar, electricity, energy, environment, exchange, finance, flat, fossil, freight, fuel, gallon, gas, gasoline, generation, graphic, growth, icon, illustration, illustrations, industry, line, liquid, logo, minimal, money, objects, oil, outline, petroleum, power, price, refinery, substance, symbol, tank, tanker, technology, thin, web, well,