Import and export of goods; general items of technology import and export: production, processing, sales and related technology development and technical consultation of mechanical and electrical equipment (excluding automobiles), general machinery, communication equipment (excluding radio transmitting equipment and ground satellite receiving equipment), electronic products (excluding electronic publications), generators and accessories, instruments, molds, industrial automatic control system devices, computer software and hardware; sales: mechanical spare parts, automobile spare parts (excluding engines), motorcycle spare parts parts (excluding engines), wires and cables, fitness equipment, audio equipment, computers and accessories, printing machinery, hotel equipment, refrigeration equipment, first-class medical equipment, office equipment, electronic components, hardware, and electricity; engaged in construction-related business (undertaking business with relevant qualification certificates), distribution switch control equipment manufacturing, distribution switch control equipment sales, distribution switch control equipment research and development, power facility equipment sales, electrical machinery equipment sales, and electrical signaling equipment sales