Ключевые слова: abstract, blue, bolt, bolted connection, business, clear sky, cloudless, color, connected, connection, connector, construction, copy space, development, drain, empty, engineering, equipment, factory, fix, forward, industrial, industry, iron, isolated, manufacturing, medium, metal, no people, nobody, object, pink, pipe, pipeline, piping, production, related, site, sky, steam, steel, supply, switch, system, transfer, transportation, tube, water,