Import and export of goods; Technology import and export; Import and export agency (projects subject to approval in accordance with the law, business activities can only be carried out after approval by relevant departments, and specific business projects are subject to the approval results) general projects: Technical services, technology development, technical consultation, technical exchanges, technology transfer, technology promotion; Optoelectronic device manufacturing; Sales of optoelectronic devices; Instrument manufacturing; Hardware product manufacturing; Machining of mechanical parts and components; Sales of mechanical parts and parts (except for projects subject to approval in accordance with the law, independently carry out business activities with a business license in accordance with the law)