The general business items are: technical development, door-to-door maintenance and sales of mechanical equipment and accessories (excluding franchise, exclusive control, monopoly commodities and other restricted items); information consultation (excluding talent intermediary services and other restricted items); instrumentation, Sales of electronic products, communication products, and computer software and hardware (excluding franchised, exclusively controlled, and monopoly commodities); domestic trade (except for items subject to approval before registration as stipulated by laws, administrative regulations, and decisions of the State Council); import and export business ( Except for projects prohibited by laws, administrative regulations and decisions of the State Council, restricted projects must be licensed before they can be operated).