General projects for construction works (projects subject to legal authorization and subject to the approval of the relevant departments for operation); engineering and technological development; marketing of new metal functional materials; planning and design management; engineering management services; sale of medical equipment in category ii; sale of medical equipment in category i; sale of building and decoration materials; software and services related to block chain technology; installation services for general machinery; technical services, technology development, technology exchange, technology transfer and technology promotion; information system integration services; internet data services; distribution of electrical equipment; material networking services; 5g communications technology services; software development; sale of electrical equipment; sale of metal components; rental of construction and equipment; rental of special equipment; rental of equipment; rental of equi...