Ключевые слова: 3d, accumulator, alkaline, alternative, art, bolt, charge, charging, clean, color, colorful, contour, design, eco, ecology, electric, electrical, electricity, element, energy, environment, fuel, full, gear, gradient, green, icon, illustration, indicator, industry, isolated, isometric, leaf, level, lightning, line, linear, lineart, natural, nature, outline, power, recycle, renewable, sign, symbol, technology,