2901.22 Propene (propylene) 2901.22.00 D 2901.22.00 D 2901.22.01 A

2901.23 Butene (butylene) and isomers thereof 2901.23.00 D 2901.23.00 D 2901.23.01 C

2901.24 Buta-1, 3-diene and isoprene 2901.24.10 D 2901.24.10 D 2901.24.01 D

2901.24.20 A 2901.24.20 B

2901.24.50 B

2901.29 Unsaturated acyclic hydrocarbons nes 2901.29.00 A 2901.29.10 C 2901.29.01 A

2901.29.50 B 2901.29.99 C

North American Free Trade Agreement, 1992 Oct. 7 Tariff Phasing Descriptions · 第 197 / 531 题