Software development; general equipment manufacturing (excluding special equipment manufacturing); general equipment repair; furnace, kiln, and electric furnace manufacturing; furnace, kiln, and electric furnace sales; environmental protection special equipment manufacturing; environmental protection special equipment sales; mechanical equipment research and development; mechanical equipment sales; mechanical parts and components processing; mechanical parts and components sales; metallurgical special equipment manufacturing; metallurgical special equipment sales; road cargo transportation for vehicles with a total mass of 4.5 tons or less (excluding online freight and dangerous goods); goods import and export.