“Ad. Val.”（Ad Valorem）又称从价运费。

A compound duty is a combination of an ad valorem duty and specific duty. （ ）

which tariff is usually used in commodity A: specific B: ad valorem

Which of the following is a fixed percentage of the value of an imported product?() A: specific tariff B: ad valorem tariff C: nominal tariff D: effective protection tariff E: None of the above.