Fastener manufacturing; Fastener sales; Building metal accessory manufacturing; Building metal accessory sales; Building waterproof membrane product sales; Building material sales; Mining machinery manufacturing; Mining machinery sales; Power facility equipment manufacturing; Power facility equipment sales; Power electronic component sales; Electrical instrument and meter sales; Hardware product retail; Hardware product wholesale; Railway locomotive vehicle parts sales; Photovoltaic power generation equipment leasing; Photovoltaic equipment and component sales; Metal material sales; High-quality special steel material sales; Construction steel bar product sales; Plastic product sales; Labor protection supplies sales; Rubber product sales; Metal tool sales; Pneumatic and electric tool sales; Metal structure sales; Metal product sales; Non-ferrous metal alloy sales; Chemical product sales (excluding licensed chemical products); Bearing sales; Synthetic material sales; Metal chain and other metal product sales; Mechanical equipment sales; High-speed rail equipment and parts sales; Auto parts retail; Mold sales; Metal cutting and welding equipment sales; Packaging material and product sales; Lighting appliance sales; Instrument and meter sales; Daily-use wood product sales; Import and export of goods.