Ключевые слова: bolts, building, clean, connection, curve, development, economy, energy, engineering, environment, facility, factory, gas, health, heavy, hold, hot, industrial, industry, joint, link, metal, modern, mortar, nuts, oil, pedestal, petrol, pipe, pipeline, plumbing, pollution, power, production, pump, science, standard, station, steel, strong, structure, supply, system, technology, tube, urban, valve, waste, water, white,