Ключевые слова: 015, barrel, battery, biomass, coal, color, colorful, corn, design, electricity, energy, factory, fluorescent, gas, gas station, geothermal, gradient, hydropower, icon, illustration, light bulb, mark, mining, neon, nuclear power, oil field, petroleum, plant, power line, pylon, set, sign, simple, solar, sunlight, symbol, vivid, web, wind power,