General items: Manufacturing of teaching models and aids; Sale of teaching models and aids; Manufacturing of experimental analysis instruments; Sale of experimental analysis instruments; Software development; Development of network and information security software; Technical services, technical development, technical consultation, technical exchanges, technology transfer, technology promotion; Information technology consultation services; Wholesale of computer software, hardware and auxiliary equipment; Retail of computer software, hardware and auxiliary equipment; Computer system services; Sale of electronic products; Mold manufacturing; Mold sales; Sale of plastic products; Rubber products manufacturing; Sale of rubber products. (Except for items that require approval according to law, business activities shall be carried out independently in accordance with the business license. )