单项选择题
A.对外贸易总政策 B.关税政策 C.进出口商品政策 D.对外贸易国别政策
A.100,4000,6000 B.300,4000,6000 C.300,3000,4000 D.100,3000,4000
A.20% B.12.5% C.2.5% D.2.27%