Energy-saving technology promotion services; construction machinery technology research and technical services; oilfield technical services; information system integration services; production, repair, and sales of electronic products, specialized petroleum drilling equipment and accessories, water treatment equipment and accessories, diesel engines and accessories, power distribution switch control equipment, refrigeration equipment, stationery, hardware products, monitoring equipment, fire protection equipment, communication equipment (excluding satellite TV broadcasting ground receiving facilities), fire alarms, construction machinery and accessories, electric heating tapes and trace heating systems, steel, standard parts, fasteners, pipe fittings, valves and spiral plugs, pumps and accessories, transformers, inverters, air conditioners, instruments and meters, motors, welding electrodes, agricultural machinery, motor protectors, heat exchangers, flooring, wires and cables, bearings, soundproofing and thermal insulation materials, rubber products, glass products, ceramic products, plastic products, molds, instruments and meters, lighting equipment, tarpaulins, fracturing truck accessories, tractor accessories, electronic components; sales and import/export trade of chemical products (excluding hazardous chemicals), industrial automatic control system devices, metal products (excluding precious metals), wood products, fertilizers, coal, furniture, sporting goods (excluding crossbows), lubricants, computers and auxiliary equipment, boilers, pipes, modular houses, marine lifesaving equipment, knitwear, clothing, shoes, and hats, lifting equipment, generator sets, tires, guardrails, automobiles and accessories, feed, elevators, building materials, kitchen and bathroom supplies, and daily necessities; sales of electric heaters.