Main points of the text B 1. Four forms of tariff 2.Ad valorem duty 3.Specific duty 4.Alternative duty 5.Compound duty 制价爱行蜀易大考Main points of the text Main points of the text 1.Four forms of tariff Four forms of tariff 2.Ad valorem duty Ad valorem duty 3.Specific duty Specific duty 4.Alternative duty Alternative duty 5.Compound duty Compound duty B