简介：ByadoptingtheAECIIndexMethodproposedbytheauthorandusingmethodofpopulationsimulation,thispaperanalyzesquantitativelythetrend,intensityandregulationoftheeconomicpressureofpopulationageinginChina,andcomparesChinawithothercountries.Itdrawsthefollowingconclusions:(1)Chinawillfacegreateconomicpressureduetopopulationageinginthefirsthalfofthiscentury.Accordingtothemediumprojection,thepressurewillincreasemostrapidlyduringtheperiodfromthemiddleof2020stotheendof2030s,andreachitspeakaround2040whentheintensityofthepressuremayquadruplethatin2010.(2)ThegreateconomicpressureofpopulationageingmayremarkablyreduceChina'sdevelopmentmomentum.(3)Toeasethepressure,weshouldrelymainlyoneconomicmeasures,supplementedbypopulationcontrolmeasures.(4)TograduallyliberalizetheprevailingbirthcontrolpolicyonthepremiseofstickingtothestatepolicyoffamilyplanningisarationalapproachtoregulatetheeconomicpressureofpopulationageinginChina.Ontheonehand,thiscaneasethepossibleeconomicpressureofageinginthefuture,andontheotherhand,itcancontrolthepressureofpopulationsizewithinanendurablelimit.

简介：Buildingenergyefficiencyisalong-termstrategytoachievesustainabledevelopment,buttheinconsistenciesofmaininterestsduringtheimplementationleadtotheneedforgovernmentregulationinbuildingenergyconservation.Implementationofbuildingenergyefficiencyofgovernmentregulationcoversthreeaspectsofconstructionandinvolvesrelevantparticipators,sothepaperanalyzesinterestsandrolesoftherelatedsubjectsinbuildingenergysaving,explorethemotivationsanditsconversionmechanismofeachplayer,anddissectthegamerelationshipofassociatedearningsofdevelopers’andconsumers’behaviorsselectionundergovernmentcontrol.Finally,thepaperproposesbasicrequirementsofbuildingincentivepoliciesforrelatedsubjectsundergovernmentcontroltoregulatethemainbehaviorsofsubjectsinbuildingenergyefficientbuildingsandachieveenergyefficiencygoalsandbalanceofallparties’benefits.

简介：以及鸦片对当时中国经济的侵害,英国与中国进行贸易,在当时的中国对外贸易中

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简介：Thispaperstudiesaservicefirmwhosebusinesstimecanbedividedintoseveralperiods,eachprovidingdifferentvaluetocustomers.Heterogeneousserviceisamajorreasonresultinginimbalancesbetweensupplyanddemand.Sincecustomersdifferintheirdegreeofimpatience,firmscanusedifferentialpricingmechanismstooptimizetheirobjectivesandmatchsupplywithdemandineachperiod,byinducingcustomerstochoosedifferentperiods.Westudytwotypesoffirms,aninternalfirm,theobjectiveofwhichistomaximizethesystem′s(includingthefirmandallthecustomers)totalnetvalue,andacommercialfirm,whichaimstooptimizeitsownprofit.Thoughimpatiencefactorsarecustomers′privateinformation,foreachtypeoffirm,wederivetheoptimalincentivecompatiblepricingpolicy,underwhichallthecomingcustomerswillfollowthefirm′sassignment,thatis,patientcustomerswillbuytheserviceinhigh-valueperiods,buttheirwaitingtimewillbelonger,whileimpatientcustomerswillenterintothelow-valueperiods,buttheywillbecompensatedbyshorterwaitingtimes.Furthermore,intheinternalfirm,wealsoprovethatthismechanismenablesthedecentralizationofdecisions,whilemaintainingcentralizedsystem-wideoptimality.Numericalanalysisshowsthatwhenthereissufficientcapacity,theinternalfirmdoesnotalwaysneedtosetlowerpricesthanthecommercialfirmineveryperiod.

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简介：　　Hyperbole（夸张）在TOEFL听力中的运用也可谓炉火纯青,除了TOEFL听力,修辞堪称TOEFL听力调色

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简介：Inflammasomes是由响应病原体暴露或细胞的损坏便于煽动性的cytokines的版本调整天生的有免疫力的反应的多蛋白质建筑群。支持inflammatoryinflammasome发信号是重要的招待防卫，帮助开始跟随侮辱到主机，而是罐头的织物修理的进程有害，当过多或长期时。因此，inflammasome活动紧被调整。这里，我们讨论inflammasome规定的一批评机制，ubiquitination，那作为蛋白质稳定性和trafficking的一个通用调节的人工作。最近的研究由蛋白质ubiquitination提供了重要卓见进inflammasome激活的规定。明确地，当它联系到ubiquitination，我们考察inflammasome功能的分子的规定，并且讨论含意让治疗学的发展明确地指向异常inflammasome发信号。

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简介：Standingwavesareformedduetothereflectionwhenwavesmeetverticalwall,thereforestrongstructuresareneededtokeepthewallstabilityundertheseriouswaveattack.Fortheimprovementoftheworkingconditionandincreaseofthestabilityofthewall,thelowerreflectingbreakwatershaveat-tractedcloseattentionReportsmostlyfromJapaneseresearchersareoftenconcernedwiththewallofcaissonequippedwithopenwindows.Inthispaperakindofhollow-pipeperforatedbreakwaterisexam-inedwhichwavesmaypartiallyperforateintotheharbourbasin.Thewaveinfrontofthewallcanonlyformpartialstandingwaveandwaveforceisreducedobviously.Andthetheoreticalcalculationofwaveforceandanalysisofwaveforcespectrumareallderived.Comparisonbetweentheresultsfromtheoreticalcalculationandhydraulicmodelingshowsreasonableagreement.

简介：近年来高考作文呼唤真情的声音是越来越响亮了.而学生作文中怎样才能写出真情实感呢？从教多年,心中却颇感惶惶.这些年来素质教育是发光发热,按说语文教学应该是离以＂人的发展为中心＂的本位越来越近了.本文就此做了一些探讨.

简介：＆quot;营改增＆quot;是交通运输业、现代服务业企业征税方法的一次重大变革,受到企业的高度重视,目前涉及＆quot;营改增＆quot;的企业都正在积极学习相关政策,做好准备工作.但笔者发现,大多数企业只关注了＆quot;营改增＆quot;对企业缴纳流转税的影响,忽视了对企业所得税的影响.企业的任何经济行为,都将对企业所得税产生影响,企业应予以重视,避免税收风险.本文探析了＆quot;营改增＆quot;对铁路运输企业流转税、所得税带来的若干影响,并提出相应的对策.

简介：这样听的结果很可能是你把每个单词都听明白了,　　反复精听训练 ,一 个一个单词地去听