Ключевые слова: backgrounds, black, blue, cable, circuit, color, communications, connection, connector, cord, curve, data, electrical, electronics, elements, energy, hank, hole, image, industry, insulation, isolated, isolation, liquid, metal, network, nobody, object, pair, plug, power, red, rope, round, shape, smooth, steel, supply, technology, telephone, terminal, two, vein, wire,