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
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单项选择题
The loading, unloading, transshipment and transit of inward and outward mail bags are （）Customs control and a covering way bill should be submitted to the Customs by the enterprise providing postal service.

A. subject to
B. upon
C. into
D. with
单项选择题
行政许可的实施机关可以对已设定的行政许可的实施情况及( )适时进行评价，并将意见报告该行政许可的设定机关。
A．项目的可行性
B．推行的重要性
C．存在的必要性
D．设置的合理性
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