preferentialist关税特惠主义者preferentialadj.优先的；优待的；特惠的preferential reabsorption优先重吸收preferential tax policies优惠的税收政策preferential tariff margin优惠关税幅度<差额>preferential gas-wetting优先气湿preferential fertilization优先受精preferential concentration局部富集preferential recombination择优复合preferential exchange rate特惠汇率,优惠汇价Preferential Planning List优先计划表preferential tariff system特惠关税制