Instrument, mechanical spare parts,Instruments and meters, casting and valve, mechanical and electrical products, electronic products, chemical products, non-ferrous metals, steel, wood, hardware, decoration materials, textiles, minerals, ores, gold bullion, silver bullion, building materials, road construction, municipal engineering, earthwork, goods and technology import and export (excluding shall the pre-approval of the project; according to law shall be the post approval of the project,