[单项选择题] Impostion of a discriminating duty belongs to the tariff rates falling into the category of ______.
A.general rates
B.preferential rates
C.ad valorem duty rates
D.special duty rates
正确答案:D

[单项选择题] Impostion of a discriminating duty belongs to the tariff rates falling into the category of ______.
A.general rates
B.preferential rates
C.ad valorem duty rates
D.special duty rates
正确答案:D