Ключевые слова: background, black, building, business, chain, coal, construction, design, electricity, energy, engineering, environment, factory, fuel, gas, graphic, icon, icons, illustration, industrial, industries, industry, isolated, line, logistics, manufacturing, mining, nuclear, oil, petrol, petroleum, plant, pollution, power, production, refinery, resources, set, sign, smoke, station, supply, symbol, technology, transportation, truck, web, white, work,