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　　其??(qi)二??(er)??，懲??(cheng)罰??(fa)性??(xing)關(guān)??(guan)稅??(shui)政??(zheng)策??(ce)將??(jiang)導(dǎo)?(dao)致??(zhi)全??(quan)球??(qiu)貿(mào)??(mao)易??(yi)成??(cheng)本??(ben)上??(shang)升??(sheng)??，迫??(po)使?(shi)石??(shi)油??(you)貿(mào)??(mao)易??(yi)改??(gai)道?(dao)??，進??(jin)一??(yi)步??(bu)加??(jia)劇??(ju)了??(le)國??(guo)際??(ji)油??(you)價??(jia)的??(de)不??(bu)確??(que)定??(ding)性??(xing)??。??美??(mei)國??(guo)對??(dui)進??(jin)口??(kou)鋼??(gang)鐵??(tie)和??(he)鋁??(lv)加??(jia)征??(zheng)關(guān)??(guan)稅??(shui)??，增??(zeng)加??(jia)國??(guo)內(nèi)??(nei)石??(shi)油??(you)開??(kai)采??(cai)和??(he)運??(yun)輸??(shu)的?(de)成??(cheng)本??(ben)??，間??(jian)接??(jie)推??(tui)高?(gao)油??(you)價??(jia)??。同?(tong)時??(shi)??，貿(mào)??(mao)易??(yi)摩??(mo)擦??(ca)導(dǎo)??(dao)致??(zhi)的?(de)全??(quan)球??(qiu)經(jīng)?(jing)濟??(ji)放??(fang)緩??(huan)預(yù)??(yu)期??(qi)??，又??(you)對??(dui)油??(you)價??(jia)形??(xing)成??(cheng)了??(le)下??(xia)行??(xing)壓?(ya)力??(li)??。這??(zhe)種?(zhong)復(fù)?(fu)雜??(za)的?(de)相??(xiang)互??(hu)作??(zuo)用??(yong)使??(shi)得??(de)國??(guo)際??(ji)油??(you)價??(jia)的??(de)波??(bo)動??(dong)更??(geng)加??(jia)難??(nan)以??(yi)預(yù)??(yu)測??(ce)??。。