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服务程序是一类辅助性程序,它提供各种软件运行时所需的服务。下列哪一个属于服务程序?

A、语言处理程序
B、调试程序
C、操作系统
D、数据库管理系统
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正确答案:

B

答案解析:

暂无解析

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Thecowboyistheheroofmanymovies,.Heis,eventoday,asymbolofcourageandadventure.Butwhatwasthelifeofthecowboyreallylike?

Thecowboy’sjobisclearfromthewordcowboy.Cowboyweremenwhotookcareofcowsandothercattle.ThecattlewereintheWestandinTexas.PeopleinthecitiesoftheEastwantedbeefthesecattle.Trainscouldtakethecattleeast.Butfirstthecattlehadtogettothetrains.Partofthecowboy’sjobwastotakethecattlehundredsofmilestotherailroadtown.Thetripswerecalledcattledrivers.Acattledriveusuallytookseveralmonths.Cowboysrodeforsixteenhoursaday.Becausetheyrodesomuch,eachcowboybroughtalongabouteighthorses.Acowboychangedhorsesseveraltimeseachday.

Thecowboyshadtomakesurethatcattlearrivedsafely.Beforestartingonadrive,thecowboysbrandedthecattle.Theyburnedamarkonthecattletoshowwhotheybelongedto.Butthesemarksdidn’tstoprustlers,orcattlethieves.Cowboyshadtoprotectthecattlefromrustlers.Rustlersmadethedangeroustripevenmoredangerous.

Eventhoughtheirworkwasverydifficultanddangerous,cowboysdidnotearnmuchmoney.Theywerepaidbadly.Yetcowboyslikedtheirwayoflife.Theylivedinawildandopencountry.Theylivedalifeofadventureandfreedom.

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C.moviesinthepastD.cowsandothercattle

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A.tobeaheroinreallifeB.tobeaheroofthemovie

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A.theWeststatesandTexasB.thecitiesoftheEastStates

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A.burningamarkontheircowsB.keepinganeyeoncattlethieves

C.makingthetripmoredangerousD.lookingaftereightcowseachperson

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A.theylikedtheirwayoflifeB.theymadealotofmoney

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