Metal materials sales; Technical services, technology development, technical consulting, technology exchange, technology transfer, technology promotion; New materials technology research and development; Metal products research and development; Hardware products research and development; Metal products sales; Metal structure sales; Non-ferrous metal alloy sales; Hardware products wholesale; Metal chains and other metal products sales; High-quality special steel materials sales; Bearings, gears and transmission parts sales; Wire rope sales and their products sales; Building materials sales; Building decoration materials sales; Construction rebar products sales; Construction metal accessories sales; Lightweight building materials sales; Building blocks sales; Construction waterproof coil products sales; Anti-corrosion materials sales; Cement products sales; Rubber products sales; Plastic products sales; Electrical equipment sales; Instrument sales; Special equipment sales; Mold sales; Valves and plug sales; Wires, cable business; Electronic components wholesale; Mechanical parts, parts sales; Packaging materials and products sales; Doors and windows sales; Communication equipment sales; Daily