信息系统工程监理活动的主要内容被概括为“四控、三管、一协调”,一下算相中不属于“四控”的是()
A、信息系统工程质量控制C
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Ifyoudonotfindtherequiredinformationusingthetipsfromtheprevioussection,thenyouneedtoconsultanonlineservicetofindthepieceofinformationyouwerelookingfor.Threedifferenttypesofserviceshavebeenestablishedovertheyears:crawlers,directoriesandmetasearchengines.Thefirstcrawlerwascreatedbackin1993.ItwascalledtheWorldWideWorm.Itcrawledfromonesitetothenextandindexedallpagesbysavingthecontentofthewebpagesintoahugedatabase.Crawlersorspidersvisitawebpage,readit,andthenfollowlinkstootherpageswithinthesiteandevenfollowlinkstoothersites.Webcrawlersreturntoeachsiteonaregularbasis,suchaseverymonthortwo,tolookforchanges.Everythingacrawlerfindsgoesintoadatabase,whichpeopleareabletoquery.TheadvantageofthewebcrawlersisthattheyhaveanextensivedatabasewithalmostthecompleteInternetindexedinit.Thedisadvantageisthatyougetthousandsofwebpagesasaresponseforalmostanyrequest.Webdirectoriesworkalittledifferently.Firstofalltheycontainastructuredtreeofinformation.Allinformationenteredintothistreeiseitherenteredbythewebmasterwhowantstoannouncehisnewwebpageorbythedirectorymaintainerwholooksatthewebpagessubmitted.ThedirectorieswherewebmasterscansubmitboththeURL(UniformResourceLocator)andthedescriptionnormallycontainmoremisleadinginformation.Gettingintomostwebdirectoriesisacombinationofluckandquality.Althoughanyoneisabletosubmitawebpage,thereisnoguaranteethatacertainpagewillbeincluded.Somedirectorieschargeforsubmission,whichisbasicallyarip-off.Somecrawlersmaintainanassociateddirectory.Ifyoursiteisinthedirectory,therankingofyourwebsitenormallywillbehigher,asitisalreadypre-classified.Manydirectoriesworkwithcrawlerstogether,inordertodeliverresults,whennothingcanbefoundinthedirectory.MetasearchenginesdonothaveadatabasewithURLsanddescriptions.Insteadtheyhaveadatabaseofsearchengines.Ifyouenteryourkeywordsintoametasearchengineitwillsendoutrequeststoallthedirectoriesandcrawlersithasstoredinitsdatabase.ThemetasearchengineswithamoresophisticatedapplicationinthebackgroundareabletodetectdoubleURLswhichcomebackfromthevarioussearchenginesandpresentonlyasingleURLtothecustomer.
34.Crawlerisakindof__________.
A.wormB.searchengineC.serviceD.directory
35.ThedisadvantageofCrawleristhatit__________.
A.providesacompletedatabase
B.takestoomuchtimetofindtheneededinformation
C.providestoomuchuselessinformation
D.givesresponsetoeveryquest
36.Whocaninputinformationtothewebdirectories?
A.Onlywebmasters.
B.Bothdirectorymaintainersandwebmasters.
C.Anyonewhowantstoannounceawebpage.
D.Anyonewhohasfoundanewwebpage.
狭义的电子合同形式可以是()
承担责任的adj.r_______________
试述我国《电子签名法》的主要特点。
英译汉:Evenasexchangesemergetoenablerichinteractionamongcompanies,businessesarelookingforwardtotheInternettoenabletheadoptionoftrulydynamicpricing.Onesolutionisemergingintheformofbots,softwarethatservesasanagentactingonbehalfofaspecificuserorapplication.Advancingbottechnologyenablesdynamic,automated,real-timeinteractionbetweenbuyersandsellers,allowingsellerstocapturethetruevalueoftheirgoodsinthemarket.