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　　事??(shi)實(shí)??(shi)上??(shang)??，美??(mei)國?(guo)貨??(huo)物??(wu)貿(mào)??(mao)易??(yi)逆??(ni)差??(cha)的??(de)形??(xing)成??(cheng)與??(yu)其??(qi)自??(zi)身??(shen)政??(zheng)策??(ce)密??(mi)切??(qie)相??(xiang)關(guān)??(guan)??。??為??(wei)維??(wei)持??(chi)科??(ke)技??(ji)霸??(ba)權(quán)??(quan)??，美??(mei)國??(guo)長??(chang)期?(qi)對?(dui)半??(ban)導(dǎo)??(dao)體??(ti)、航??(hang)空??(kong)航??(hang)天?(tian)等??(deng)高??(gao)科??(ke)技?(ji)產(chǎn)??(chan)品??(pin)出??(chu)口??(kou)實(shí)??(shi)施?(shi)嚴(yán)??(yan)格??(ge)管??(guan)制??(zhi)??。這??(zhe)種??(zhong)“自??(zi)我??(wo)設(shè)??(she)限??(xian)”實(shí)??(shi)質(zhì)??(zhi)上??(shang)抑??(yi)制?(zhi)了?(le)美??(mei)國??(guo)科??(ke)技?(ji)產(chǎn)??(chan)品??(pin)的??(de)比??(bi)較??(jiao)優(yōu)??(you)勢??(shi)??，損??(sun)失??(shi)了??(le)大??(da)量??(liang)市??(shi)場??(chang)份??(fen)額??(e)??。當(dāng)??(dang)美??(mei)國??(guo)政??(zheng)客??(ke)抱??(bao)怨?(yuan)“制?(zhi)造??(zao)業(yè)??(ye)外??(wai)流??(liu)”時(shí)??(shi)??，卻??(que)對??(dui)本??(ben)國秘(guo)扼??(e)殺??(sha)潛??(qian)在??(zai)出??(chu)口?(kou)能??(neng)力??(li)的??(de)政??(zheng)策??(ce)避??(bi)而??(er)不??(bu)談??(tan)??，其??(qi)“吃??(chi)虧??(kui)論??(lun)”只??(zhi)是??(shi)美??(mei)國??(guo)政??(zheng)策??(ce)的??(de)自??(zi)我??(wo)實(shí)??(shi)現(xiàn)??(xian)??。。