Ключевые слова: alarm, art, background, city, color, colorful, contour, danger, department, design, drop, emergency, equipment, extinguish, faucet, fire, firefighter, flame, hose, hydrant, icon, illustration, isolated, line, linear, lineart, metal, object, outline, pipe, plug, pressure, prevention, protection, rescue, safe, safety, security, single, steel, street, symbol, tool, urban, water,