The general business items are: Sales of mechanical and electrical equipment; Sales of hydraulic power machinery and components; Sales of industrial automatic control system devices; Sales of pneumatic power machinery and components; General mechanical equipment installation service; Sales of mining machinery; Sales of special equipment for environmental protection; Installation and maintenance of industrial robots. (In addition to the items that need to be approved according to law, the business activities shall be carried out independently according to law with the business license), the permitted business items are: Manufacturing of marine auxiliary equipment; Industrial robot manufacturing; Ship charter. (Projects that need to be approved according to law can only be operated with the approval of relevant departments. The specific operation items shall be subject to the approval documents or licenses of relevant departments)