Ключевые слова: acetylene, acid, air, argon, balloon, barrel, black, blue, carbon, chemical, compressed, container, cylinder, danger, dioxide, energy, equipment, explosive, factory, flammable, gas, gauge, green, helium, high, hydrogen, icon, industrial, industry, liquefied, liquid, lpg, manufacturing, medical, metallic, meter, natural, nitrogen, o2, oxygen, pressure, production, propane, steel, storage, symbol, tank, technology, valve, welding,