Ключевые слова: above, city, conducting, construction, district, energy, engineering, equipment, fuel, gas, ground, heat, hot, housing, hydropower, industrial, industry, infrastructure, insulation, iron, line, main, metal, old, pipe, pipeline, piping, plant, power, serve, service, sky, snow, steam, steel, stream, structure, supply, support, system, technology, thermal, transfer, transit, transmission, transportation, tube, tubing, urban, water,