Metal products, textile machinery, casting machinery, construction equipment, machinery, such as plastic parts, hardware and machinery, printing machinery manufacturing, sales; Chemical raw materials (not including dangerous goods) sales: Business of the enterprise products and technology export business and the enterprise the required machinery and equipment, spare parts, raw and auxiliary materials import business and technology, but the state limit or prohibit the import and export of goods and technology (subject to the above range operating permit, accountable operating permit).