Ключевые слова: adult, center, clipboard, code, collar, colleague, colours, commercial, concentration, connection, contractor, control, cooperation, data, dial, efficiency, electrician, electricians, electricity, engineer, examining, expertise, females, firewall, foreman, gear, group, hardhat, helmet, horizontal, human, image, indoors, industrial, industry, intelligence, meter, ohm, people, power, regulation, safety, security, technology, test, using, voltage, working,