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已知函数f(x)=ax+﹣2. (1)若a=2,求f(x)的单调区间; (2)若函数f(x)存在唯一的零点x0,且x0>0,则a的取值范围.
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高三下学期数学《》真题及答案
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Asafirstresponderyouneverknowwhattypeofsituationyoumightwalkintoorwhoyou'llmeetalongtheway.That'sdefinitelybeenthecaseforJeffreyLanenberga51﹣year﹣oldparamedic急救医务人员since1984. TenyearsintothejobLanenbergreceivedacallthatreportedthatamaninhisearly30shadfallendownintheMallofAmerica.WhenLanenbergandhispartnerarrivedatthescenetheyfoundtheyoungmalefacedownontheground.Hehadgoneunconsciousmakingweakattemptstobreathe.Hiswifestoodbesidehimholdingtheirsmallsoninhorror.Theyquicklyrushedtodefibrillate除颤andcalmthemantokeephimundercontrol.AfterLanenbergdroppedthepatientoffattheneighboringhospitalhethoughtaboutthemanandhisfamilyforalongtime. LanenbergthoughthehadexperiencedeverythingunderthesununtilonerandomvisittoOfficeMaxthreeyearsagowherehemetamanrepeatedlywalkbackandforthwhilestaringathim.Asitturnedoutthemanwasthepatienthehadsaved20yearsearlier. Yougaveme20yearsmorethanIeverthoughtI'dhavethemansaid.HethankedLanenbergrepeatedlyandtoldhimhehadsomeonehewantedhimtomeet.Hesteppedaroundthecornerandreappearedwitha20﹣something﹣year﹣oldman.Lanenberginstantlyknewthatitwasthesonhehadseenstandingbyhismotherallthoseyearsago. ThatdaychangedmylifeLanenbergsaid.Beforethateverythingwasaboutwork…WhenItalktomybeginner﹣trainingclassItellthemyouneverknowtheimpactyoucanhaveonsomeone'slife. 1WhatdidLanenbergdowiththeyoungman? A.Hegavethemanthefirstaid. B.Hecuredthemanatthescene. C.Heonlysentthemantohospital. D.Hetookcareoftheman'swifeandson. 2WhatdidLanenbergthinkoftheencounterwiththeman? A.Itwasunbelievable. B.Itwasacommonroutine. C.Itwasamatterofcourse. D.Itwasadangeroussituation. 3WhywasthemanthankfultoLanenberg? A.Lanenberghelpedbringuphislittleson. B.Lanenbergdonatedtosupporthisfamily. C.Lanenberggavehimthepresenthappylife. D.Lanenbergtaughthissontobeanewdoctor. 4HowdidthemeetingchangeLanenberg'slife? A.Hechangedhisattitudetohisjob. B.Hewasrewardedwithmuchmoney. C.Hegotapromotiontobeateamleader. D.Hetookupteachingworktotrainnewcomers.
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Thereareseveraldifferenttypesoffiredepartments.Somehirefull﹣timepaidfirefightersandsomearerunentirelybyvolunteers.1afirefightermustgothroughstrictphysicalandacademictrainingtoensureastrongknowledgeoffiresafetyandthephysicalstrengthtohandlethetasksrequiredbymembersofafiredepartment. Joiningafiredepartmentrequiresthatbothphysicalandwrittentestsarepassedwithscoresshowingathoroughknowledgeoffiresafety.2. Thefirststepinjoiningafiredepartmentasapaidfirefighteristosubmitanapplicationaswellasacquiretheappropriatetraining.Usuallyfirefightersmusthaveahighschooldiplomaandsomecompletetwo﹣or﹣four﹣yearprogramsinfirescienceatcommunitycollegesanduniversities.3andifacandidatealreadyhasconnectionsatafiredepartmenthemayapplyforapositionstraightoutofhighschool. Onceacandidateappliesandisacceptedfortrainingatafiredepartmenthemustthencompleteseveralweeksoftrainingatthedepartment'strainingcenter.4.Whenthisisdonethecandidateissenttoafirecompanyforaperiodofprobation实习.Hehastocontinuetraininginthenewpositionwhilebeingdirectedbyexperiencedfirefighters.5.Anapplicationmustbesubmittedtothevolunteerfiredepartmenttheniftheapplicationisacceptedthecandidatewilllakeatrainingprogramandthenberequiredtopassaphysicalandwrittentest.Firefightersmustalsobecomecertified认证asEmergencyMedicalTechniciansEMTs.ThelevelofEMTcertificationisdeterminedbytheindividualdepartments. A.Althoughitisdemanding B.Whichevertypeisdesired C.Howeveranacademicprogramisnotrequired D.Forvolunteerfirefighterstheprocedureissimilar E.Butjoiningavolunteerfiredepartmentistotallydifferent F.Trainingconsistsofclassroomworkandpracticaltraining G.Alsoacandidatemustbeabletorespondquicklyinemergencies
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FromAntiguatoZanzibarfthesespotspromiseanincredibletripfor2019. AntiguaGuatemala Antiguaiswortheverypennybutthatdoesn'tmeanyou'llhavetoemptyyourwalletsaysHudson.Thereareplentyofbudgel﹣carisciousactivities.Itwon'tcostyouacointovisitSantoDomingodelCerroanoutdoorsculpturepark.Wantingsomethingsweet?HeadtoChocoMuseo.Admissionisfreeandsoarethesamples! OdessaUkraine Odessaishavingabitofatourismboomnationwide﹣notthatwe'resurprisedgivenitssandybeachesandpastel﹣coloredbuildings﹣butit'sstillfairlyundertheorderforinternationalaudiences.Youcanalsocountonthisportcityforaffordablefun.TicketstotheOdessaOperaHousestartatamere﹩2! BogotaColombia TravelersonbudgetwillfindColombia'svastcapital.farmoreofabargainandeverybitasfascinatingsaysHudson.It'sfreetovisitMuseodeOroandonSundaysmanyofthebigroadsareclosedtoaccommodatefoodcartsstreetentertainersandpedestrians. Zanzibar Zanzibarattractsvacationerswithitswhitesandbeachesgreenish﹣blueddescolorfulcoralreefsandoceanfrontseaside.OfcoursewanderinginhistoricStoneTownisprettyappealingtoo.Eitherwayyouneedn'tspendapennyinthisamazingplace.It'salsoworthnotingthatJozaniForestistheonlyplaceintheworldyoucan9eeendangeredredcolobusmonkeys. 1Whichofthefollowingrequiresadmissionfee? A.ChocoMuseo. B.StoneTown. C.MuseodeOro. D.OdessaOperHouse. 2WhatisspecialtoZanzibar? A.Whitesandbeaches. B.Colorfulcoralreefs. C.Redcolobusmonkeys. D.HistoricStoneTown. 3Whatdothefourdestinationshaveincommon? A.Theyarecoastalcities. B.Theyareinexpensivetovisit. C.Theywelcomestreetentertainers. D.Theywillmakeyourwalletempty.
如图是自动测定油箱内油量的装置图油量表相当于电压表其中R0是一定值电阻R是弧形变阻器它的金属滑片P是杠杆的一端O为杠杆支点下列判断正确的是
假定你是李华你和几个朋友打算去参观茶园想邀请美国交流生Henry同往.请你给他写封邮件告知活动安排.内容包括 1.时间和地点; 2.学习如何沏茶品茶; 3.介绍中国茶文化的历史和发展. 注意 1.词数100左右; 2.可以适当增加细节以使行文连贯. DearHenry Yours LiHua
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如图1灯距地面的高度为H身高为h的人自路灯的正下方经过看到自己头部的影子正好在自己脚下.如图2如果人以不变的速度v匀速向前走由A到B则人头部的影子由C运动到D.证明人头部影子的速度为.
假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.文中共有10处语言错误每句中最多有两处.每次错误仅涉及一个单词的增加删除或修改. 增加在缺词处加一个漏字符号∧并在其下面写出该加的词. 删除把多余的词用\划掉. 修改在错的词下画一横线并在该词下面写出修改后的词. 注意1.每处错误及其修改均仅限一词; 2.只允许修改10处多者从第11处起不计分. Mauritiusanislandnationisworkingtogetridoffossilfuelsbyreplacethemwithsugarcanestalks.Anislandhasreliedonimportedgasasfuelforlongbutitpointsoutwhichitsmaincashcropisprovidingamoreeconomicalchoice. Onceasugarcanestalkhassqueezedapileofdrystalksremain.Theseleftoversarethenburnedtogeneratepoweranditaccountsfor14percentsoftheisland'senergyneeds. Sugarcanesthenation'smaincashcropcontinuesleadingthechargetowardsamoreenvironmentalfriendlyfuture.Currentlyfoursugarcompaniesrunhisownpowerstationtogetherwithgeneratingupto60%oftheisland'selectricity.Howeverthecarbondioxidegeneratedbytheburningprocessisthenusedtoaddtosoftdrinks.
Balletisaformalkindofdanceperformancewitharichandinterestinghistory.ThewordballetcomesfromtheFrenchlanguageand1bebasedontheItalianwordballetto.Ballettomeansalittledance.Ballet'searlyrootsbeganinItalyinthelate1400s.ButitwasinFrance2balletdevelopedintotheformweknowtoday. TheFrenchrulerLouistheFourteenthhadabiginfluence3thedirectionofballetinitsearlyhistory.HeruledFranceforseventy﹣twoyears4startin1643.Hestarteddancingasaboyandworkedharddaily. LouistheFourteenthturnedballetintoaformofdancethatreflected5hepowerandinfluence.Ballet'smanyrulesand6extremedetailedmovementsexpressedaperson'spowerandsocialrelations.Thekingmadesurethatballetbecamea7requireforthepeopleofhiscourt.HealsostartedtheRoyalAcademyofDance8importantpeoplecouldlearnthisart.Theaimofthisdancewasself﹣controlorderandperfection. Balletslowlychangedfromadanceattheking'scourttoone9performbyprofessionaldancers.WhenLouistheFourteenthdiedin1715ballet10bringtoodierpartsofEuropeandwasdevelopinginotherways.
面镜不是使光线透过而是使光反射回去的仪器光线遵循反射定律如图甲是凹面镜它将平行主轴的入射的光线会聚在焦点F上这是因为表面每个点的法线方向不同光线以不同的角度反射根据光路可逆性凹面镜不仅可以使平行光线汇聚于焦点还能使过焦点的光线反射成平行于主轴的光请根据以上叙述在图乙中画出H0的成像光路图.
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