Ключевые слова: activity, background, black, building, business, chemical, circle, construction, drainage, efficient, engineering, equipment, group, hardware, heap, heating, industrial, industry, infrastructure, large, line, lying, material, metal, object, pile, pipe, pipeline, piping, plastic, plug, plumbing, pressure, project, pvc, red, repair, round, sewage, site, stack, stacked, storage, technological, technology, tube, tubing, underground, vehicle, water,