Ключевые слова: background, black, blue, cable, close, closeup, connection, construction, design, electric, electrical, emergency, energy, engineering, equipment, exit, experiment, gas, illustration, industrial, industry, installation, interior, iron, isolated, lab, laboratory, light, medical, metal, microscope, modern, person, pipe, pipeline, pipes, plastic, plumbing, power, research, science, scientific, scientist, steel, supply, technology, tube, valve, water, white,