Ключевые слова: a, actuator, alarm, alignment, arrow, bell, caution, colorful, concrete, conduit, connection, crisscross, emergency, equipment, extinguisher, faucet, fire, firefighting, fittings, flange, flow, gauge, hazard, hose, industry, instrument, intricate, joint, line, measurement, meter, parallel, pattern, pipe, pipeline, red, resources, row, safety, sprinkler, stopcock, supply, system, tap, technology, tube, utility, valve, wall, warning, water,