Manufacturing, processing, sales, technology development, technical consulting, testing, and promotion services of auto parts, motorcycle parts, metal products, control lines and accessories, garage door components, plastic products, and molds; sales of mechanical equipment, metallurgical powder products, and nonferrous metal products; self-operated and agency import and export business of various commodities and technologies, except for commodities and technologies that are restricted by the state or prohibited from import and export. Retail sales of medical masks; sales of second-class medical equipment; sales of daily masks (non-medical); wholesale of protective equipment for medical staff; retail of protective equipment for medical staff; sales of labor protection supplies; wholesale of medical masks; wholesale of electronic components; sales of special labor protection supplies; sales of smart home consumer equipment; smart home consumer equipment manufacturing licensing projects: power supply business ; Installation, maintenance and testing of power transmission, power supply, and power receiving power facilities; general items of power generation business, power transmission business, and power supply (distribution) business: sales of industrial textile products; sales of Class I medical devices; sales of plastic products; sales of synthetic materials; manufacturing of generators and generator sets; sales of wind turbines and parts; sales of power transmission, transformation and distribution monitoring and control equipment