简介:摘要:分部积分法是解决积分问题的常用方法,但u和dv选择不正确就难解出题目,所以恰当的选择u和dv是运用分部积分法解题的关键。本文将被积函数中u和dv的选择固化,解决选择的困惑。
简介:Likeabigrockthrownintothepondofcurrentinternationalpowerconfiguration,theeventofSeptember11revealedtheturbulentundercurrentsbeneathitsseeminglytranquilsurface.ThesplashdowneffecthasspreadbeyondtheUnitedStatestoreacheverycornerofourplanet.Ithastriggeredrealignmentinbigpowerrelationsandwillhaveitsfar-
简介:SomechangeshaveindeedtakenplaceininternationalsituationfromSeptember11toIraqwar.Changesinbigpowerrelationsinparticularhavegivenfoodforthought.TodayⅠwouldliketofocusonthechangesintherelationsamongChina,RussiaandtheUnitedStatesaswellasmyconsiderationofChina’sdiplomacy.Whenwetalkaboutchangesintherelationsamongthethreena
简介:摘 要 该文主要为了介绍U型槽围护桩施工中,长螺旋钻孔灌注桩施工的机械配置,钻孔排土原理、混凝土压灌法施工,后插钢筋笼,适用范围,实际应用及持力层与电流关系等进行了叙述。
简介:Inthenewera,thepushandpullfactorsinChina-U.S.cooperationareemerginganddevelopingcenteringonwhethertheycouldreadjusttherelationshipbetweentherisingpowerandtheestablishedpowerinastablemanner.Therefore,China-U.S.cooperationshouldgraduallyresolvethestructuralconflictsinnecessarystrugglesandconsultations.Andtheall-aroundcooperationshouldbeplannedandpromotedintheaspectslike
简介:MilitarytransparencyisacomplicatedandsensitiveissueintheSino-U.S.relationsandalsoatouchstonetestingthedegreeoftheirinterestcoincidence.Onecanhardlygainafullandprofoundinsightintotheessentialimplicationofmilitarytransparencyifheisdominatedbytherealistlogicandputtingundueemphasisontheimportanceofitinthebilateralmilitaryrelation.GiventhefactthatChinaandtheUnitedStatesaretwoimportantpowersshoulderingcriticalresponsibilitiesformaintainingglobalpeaceandsecurity,thisarticlearguesthatonlybyadoptinganewsecurityconcepttowardmilitarytransparencycouldthetwocountriesforgeaconsensusontheinternationalsecuritysituationandremovemisunderstanding,misgivingsanddistrustintheirmilitarycontactsandcooperation.Onlybyactivelyseekingandconstructinganewsecurityregimecouldthetwosidesstrengthentheinstitutionalbasefortheirmilitarycooperation.