Electric bicycle, electric tricycle, electric sightseeing vehicle assembly; Electric bicycle accessory manufacturing; Vehicle accessories and shock absorber manufacturing and processing; Hardware products, traffic equipment, chemical products (excluding dangerous goods and precursor chemicals), automobiles (excluding sedans), and auto parts sales; Shock absorber product research and development and design; Fitness equipment manufacturing and processing; Self-operated and agent import and export of various goods and technologies, except for goods and technologies restricted or prohibited by the state for enterprise operations. Permitted items: Medical mask production; Sanitary products and disposable medical supplies production; Class II medical device production; Class III medical device operation; Road freight transport (excluding dangerous goods). General items: Medical mask retail; Medical mask wholesale; Daily mask (non-medical) production; Daily mask (non-medical) sales; Sanitary products and disposable medical supplies sales; Class I medical device production; Class I medical device sales; Class II medical device sales; Labor protection products production; Labor protection products sales; Disinfectant sales (excluding hazardous chemicals); Plastic products sales; Rubber products sales.