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如图所示，是小李同学在一个标准大气压下探究某物质变化时温度随时间变化的图象，第6min时的物体处于 状态（选填“固态”、“液态”或固液共存”）；该物质在BC段 （选填“吸收”或“不吸收”）热...
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如图所示甲乙分别是酒精在标准大气压下熔化和沸腾时温度随时间变化的图像下列说法正确的是
酒精是非晶体
酒精的凝固点是78℃
酒精在熔化时不需要吸热
不可以用酒精温度计测标准大气压下沸水的温度
在1个标准大气压下水的沸点是100℃气压越高沸点也越高.小敏在实验室观察水的汽化现象时发现水沸腾后温
如图所示是小李同学在一个标准大气压下探究某物质熔化时温度随时间变化的图象第6min时的内能第8min
在一个标准大气压下R-12的蒸发沸腾温度为R-22制冷剂在一个大气压下它的沸腾温度为℃
标准状态是指在一个标准大气压下温度T=K的状态
270.15
273.15
276.15
278.15
纯净的水在一个标准大气压下的冰点的华氏温度为度
如图所示是小李同学在一个标准大气压下探究某物质熔化时温度随时间变化的图象第6min时的内能第7mi
以下有关温度的描述合理的是
小明测得自己的正常体温大约是37.1℃
1个标准大气压下沸水的温度约98℃
1个标准大气压下冰熔化的温度是0℃
__锅内沸水的温度可以达到110℃
小明同学在做观察水的沸腾实验中描绘出如图3的温度随时间变化的图象所示下列说法中正确的是
水没有沸腾
水的沸腾温度低于100℃，说明水的比热容大
实验时的气压大于1个标准大气压
实验时的气压小于1个标准大气压
如图所示是小李同学在一个标准大气压下探究某物质熔化时温度随时间变化的图象第6min时的内能第8min
水在一个标准大气压下温度为4℃时体积最小密度最大
下列关于大气压的说法中错误的是
一个标准大气压能支持水柱10m高，
山顶上的大气压比山脚下的大气压高,
一个标准大气压下水的沸点是100
0C.,
同一地区大气压 也是变化的.
下表列出了几种物质在一个标准大气压下的熔点和沸点根据表中数据回答若要测量萘的熔点温度计的玻璃泡里应选
下表列出了几种物质在一个标准大气压下的熔点和沸点根据表中数据回答若要测量萘的熔点温度计的玻璃泡里应选
水在一个标准大气压下温度为时体积最小密度最大
水在一个标准大气压下温度为4℃体积密度最大
最小
不变
最大
如图所示是小李同学在一个标准大气压下探究某物质熔化时温度随时间变化的图象第6min时的内能第8min
下列关于大气压的说法中错误的是
一个标准大气压能支持水柱10m高
山顶上的大气压比山脚下的大气压高
一个标准大气压下水的沸点是100℃
同一地区大气压也是变化的
如图所示是水沸腾时观察到的实验情景本实验中水的沸点是________℃已知标准大气压下水沸腾时的温度
在一个标准大气压下氧沸点是℃氮的沸点是℃.
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海域夏天常会出现海市蜃楼奇观这是由于光在大气中的折射和全反射使远处物体在空中形成的A．正立虚像 B．倒立虚像 C．正立实像 D．倒立实像
假如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的以下作文文中共有10处语言错误每句中最多有两处.每处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:把多余的词用斜线\划掉. 修改:在错的词下划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. TedaBritishboyalongwithhisparentswereinvitedtovisitaChinesecalligraphyexhibitioninLondononlastSaturday.TheywereexcitingtohavesuchagoodchancetohaveacloselookatthetraditionalChineseculture.Ontheshowtheyenjoyedvariousfineworkwithgreatadmiration.TotheirjoytheysawsomeChineseartistsgivingliveperformanceswithbrushpens.Tedcouldn'thelpapproachanelderlyChineseartistwhichwaswritingattentivelywithabigbrushpen.Tedwatchedwithgreatinterestbutaskedtheartisttoshowherhowtousethebrushpen.Theartistagreedandgavehimsomeinstructionpatiently.ThenTedcouldn'twaittohavetry.HeadmithewasdeeplyattractedbytheChinesecalligraphy.
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如图所示半圆形玻璃砖置于光屏PQ的左下方．一束白光沿半径方向从A点射入玻璃砖在O点发生反射和折射折射光在光屏上呈现七色光带．若入射点由A沿圆弧向B缓慢移动并保持白光沿半径方向入射到O点观察到各色光在光屏上陆续消失．则反射光的强度变化以及光屏上最后消失的光分别是A．减弱紫光 B．减弱红光 C．增强紫光 D．增强红光
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在用双缝干涉测光的波长的实验中准备了下列仪器A．白炽灯 B．双窄缝片 C．单窄缝片 D．滤光片 E．毛玻璃光屏1把以上仪器安装在光具座上自光源起合理的顺序是填字母序号2在某次实验中用某种单色光通过双缝在光屏上得到明暗相间的干涉条纹其中亮纹ac的位置利用测量头上的分划板确定如图所示其中表示a纹位置图甲的手轮读数为mmc纹位置图乙的手轮读数为mm3已知双缝间的距离为0.18mm双缝与屏的距离为500mm则单色光的波长为μm．
Almostallscientistsfailedmanytimesbeforetheyfinallysucceeded.Intheirscientificworktheywereallstrict41themselves.Whentheyfirst42theirideastheywerealwaysrejected.43theydidnotgiveup.Itwastheirperseverance44madethemsuccessful. A45theoryistheresultofthescientificmethod.Scientistslookattheworldandtrytodescribeandexplainwhattheysee.Firsttheycarefullyobservewhattheyare46in.Toexplainwhattheyhaveseentheybuildatheoryabouttheway47thingshappenandthecausesandeffects.Thentheywere48intheirwork.Finallythescientiststestthetheorytoseeifitmatcheswhattheyhaveseenandifitcan49futureevents. Infacteverynewthoughtorideahastobe50towhatwealreadyknew.Greatthinkersorscientistsareawareofthisandtryto51newandoldideasin52manydifferentwaysaspossible.Someofthegreatestscientistsforcedthemselvestodevelopnewideasevenwhentheytiredordidnotfeel53.Theyallknewthatforeachnewideathatworksthereare54tenthatdonot. Ifwewanttodevelopou55wecantryusingsomeofthe56strategies策略ofthegreatandfamous.Wemaynotbeinterestedinbecomingscientistsbutweprobablyallwanttofindnewwaystoimproveour57.58knowsperhapsyournextthoughtwillbeanewideathatchangestheworld?Soweshouldbewellpreparedtomeet59inlifenowandtryourbesttomakegreat60toourfuturesociety. 41.A.in B.on C.with D.for 42.A.putup B.puton C.putaside D.putforward 43.A.So B.Therefore C.However D.But 44.A.that B.what C.which D.whether 45.A.scientific B.certain C.sure D.expert 46.A.curious B.interested C.cautious D.characteristic 47.A.which B.inwhich C.where D.How 48.A.absorbed B.absorbing C.absorb D.toabsorb 49.A.see B.watch C.notice D.foresee 50.A.linking B.link C.linked D.tolink 51.A.construct B.expose C.analyse D.combine 52.A.as B.than C.so D.such 53.A.inspiring B.inspired C.responsible D.enthusiasm 54.A.atmost B.atlast C.atleast D.intheleast 55.A.creativity B.conclusion C.enquiry D.chart 56.A.think B.thought C.thinking D.thoughts 57.A.life B.level C.universe D.sense 58.A.Who B.What C.How D.Which 59.A.suspect B.challenges C.clue D.announcement 60.A.contributions B.contribution C.contribute D.construction
如图所示的容器中盛有含碘的二硫化碳溶液在太阳光的照射下地面呈现的是圆形黑影在黑影中放一支温度计可发现温度计显示的温度明显上升则由此可判定
Withoutproperplanningtourismcancauseproblems.Forexampletoomanytouristscancrowdpublicplacesthatarealsoenjoyedbytheinhabitants居民ofacountry.Iftouristscreatetoomuchtraffictheinhabitantsbecomeannoyedandunhappy.Theybegantodisliketouristsandtotreatthemimpolitely.Theyforgethowmuchtourismcanhelpthecountry'seconomy.Itisimportanttothinkaboutthepeopleofadestinationcountryandhowtourismaffectsthem.Tourismshouldhelpacountrykeepthecustomsandbeautythatattracttourists.Tourismshouldalsoadvancethewealthandhappinessoflocalinhabitants. Toomuchtourismcanbeaproblem.Iftourismgrowstooquicklypeoplemustleaveotherjobstoworkinthetourismindustry.Thismeansthatotherpartsofthecountry'seconomycansuffer. Ontheotherhandifthereisnotenoughtourismpeoplecanlosejobs.Businesscanalsolosemoney.Itcostsagreatdealofmoneytobuildlargehotelsairportsairterminalsfirst﹣classroadsandothersupportfacilitiesneededbytouristattractions.Forexampleamajorinternationalclasstourismhotelcancostasmuchas50thousanddollarsperroomtobuild.Ifthisroomisnotusedmostofthetimetheownerofthehotellosemoney. Buildingahotelisjustabeginning.Theremustbemanysupportfacilitiesaswellincludingroadstogettothehotelelectricitysewerstohandlewasteandwater.Allofthesesupportfacilitiescostmoney.Iftheyarenotusedbecausetherearenotenoughtouristsjobsandmoneyarelost. 33.ToomuchtourismcancausealltheseproblemsEXCEPT. A.abadeffectonotherindustries B.achangeoftourists'customs C.over﹣crowdednessofplacesofinterest D.pressureontraffic 34.Itcanbeinferredfromthetextthat. A.theauthordoesn'tliketourismdevelopingsofast B.localpeoplewillbenefitfromtouristattractions C.otherpartsofacountry'seconomywon'tbenefitfromtourismmuch D.wecan'tbuildtoomanysupportfacilities 35.Theauthorthinksitisgoodforlocalpeopletoknowthattourismwill. A.wastealotofmoney B.weakentheireconomy C.helpestablishtheircustoms D.helpimprovetheirlife.
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Gettingstitched缝合upbyDr.Robotmayonedaybereality.Scientistshavecreatedaroboticsystemwhichdidjustthatinlivinganimalswithoutarealdoctorpullingthestrings.Muchlikeengineersaredesigningself﹣drivingcarsthemedicalresearchispartofamovetowardautonomoussurgicalrobotsremovingthesurgeon'shandsfromcertaintasksthatamachinemightperformallbyitself. Doctorswouldn'tleavethebedsidethey'resupposedtowatch.Plusthey'dhandletherestofthesurgery.Insmalltestsusingpigstheroboticarmperformedatleastaswellandinsomecasesabitbetterassomecompetingsurgeonsinstitchingtogetherintestinal肠的tissue.Thepurposewasn'ttoreplacesurgeonssaidDr.Kimwholedtheproject.Ifyouhaveallintelligenttoolthatworkswithasurgeoncanitimprovetheoutcome?That'swhatwehavedone. Ifyou'veheardaboutmachineslikethepopularDaVincisystemyoumightthinkrobotsalreadyareoperating.Notreally.Todaymanyhospitalsofferrobot﹣assistedsurgerywheresurgeonsusethemachineryastoolsthattheycontrolbyhandtooperatethroughtinyopeningsinthebody.Butrobot﹣assistedsurgeryhasbeencontroversialassomestudieshaveshownitcanbringhighercostswithoutbetteroutcomes. Kim'steamatChildren'sSheikhZayedInstituteinventedthenewSTARsystem﹣itstandsforSmartTissueAutonomousRobot﹣workssortoflikeaprogrammablesewingmachine.Theyaddedsensorstohelpguideeachstitchandtellhowtightlytopull.Buttheapproachwasn'tperfect.Inthelivinganimalstherobottookmuchlongerandmadeafewstitchingmistakeswhilethesurgeonsewingbyhandmadenone.Kimsaidtherobotcanbespedup.Hehopestobeginhumanstudiesintwoorthreeyears. 1.What'sthebesttitleforthetext? A.Anewroboticsystem B.Anew﹣stylewayofstitching C.Robotsurgeonsonestepclosertoreality D.Thenewly﹣designeddriverlessvehicles 2.WhatwillsurgeonsdowhenDr.Robotisusedinsurgery? A.Theycanhelppullthestrings. B.Theyrestatthebedside. C.Theyperformanothersurgery. D.Theyjoininwhennecessary. 3.Somepeopleareagainstusingrobotsinsurgeryprobablybecause. A.theycanbeoutofcontrol B.theywilltakeshortertime C.theyarelikelytocausegreatpain D.theymaybeexpensivetouse 4.Whatcanweinferfromthetext? A.Dr.Robotwillbeimproved. B.Dr.Robotcantaketheplaceofsurgeons. C.Dr.Robothasbeentestedwithhumantrials. D.Dr.Robotcanfreedoctors'handsintheoperation.
EdwinHubblemadehismostimportantdiscoveriesinthe1920s.Todayotherastronomerscontinuetheworkhebegan.ManyofthemareusingtheHubbleSpaceTelescopethatisnamedafterhim. EdwinPowellHubblewasbornin1889inMarshfieldMissouri.HespenthisearlyyearsinthestateofKentucky.ThenhemovedwithhisfamilytoChicagoinLouisville.HeattendedtheUniversityofChicago.Hestudiedmathematicsandastronomy天文学.Hubblewasagoodstudent.Hewasagoodathletetoo.HewasamemberoftheUniversityofChicagochampionshipbasketballteamin1909.Healsowasanexcellentboxer.Severalpeopleurgedhimtotrainfortheworldheavyweightboxingchampionshipaftercollege.Insteadhedecidedtocontinuehisstudies.HewenttoQueen'sCollegeatOxfordEngland. AtOxfordHubblestudiedlaw.HewasinterestedinBritishCommonLawbecausehisfamilyhadcometoAmericafromEnglandmanyyearsbefore.HespentthreeyearsatOxford.In1913HubblereturnedtotheUnitedStates.HeopenedalawofficeinLouisvilleKentucky.Afterashorttimehoweverhedecidedhedidnotwanttobealawyer.HereturnedtotheUniversityofChicago.Thereonceagainhestudiedastronomy.EdwinHubblewasthefirstpersontousetheHaleTelescopeHediedin1953whilepreparingtospendfournightslookingthroughthetelescopeatthesky. Hubble'sworkledtoanewresearchonthebirthoftheuniverse.Oneastronomersaidscientistshavebeenfillinginthedetailseversince.Andhesaidtherewasalongwaytogo. 21.Whatwouldbethebesttitleforthispassage? A.EdwinHubble'sLife B.EdwinHubble'sDiscoveries C.TheHubbleSpaceTelescope D.EdwinHubble﹣AFamousLawyer 22.AccordingtothispassageEdwinHubblewasmost.interestedin. A.sports B.law C.astronomy D.mathematics 23.WhichofthefollowingshowstheRIGHTorderaccordingtothispassage? a.HejoinedtheUniversityofChicagochampionshipbasketballteam. b.HestudiedastronomyattheUniversityofChicagoonceagain. c.HemovedtoLouisvillewithhisfamily. d.HeusedtheHaleTelescopetolookatthesky. e.HebecamealawyerinLouisvilleforashortperiodoftime. A.cabde B.ac.bed C.c.aebd D.abdec 24.Fromthispassageweknowthat. A.theHubbleSpaceTelescopewasmadebyHubblehimself B.EdwinPowellHubblewenttoOxfordEnglandin1910 C.EdwinPowellHubblegrewupinMarshfieldMissouri D.Hubblediedwhilehewaslookingatthesky.
光导纤维是利用全反射传导信号的装置如图所示为一光导纤维AB为其一端面．纤维内芯材料的折射率n1=1.3外层材料的折射率n2=1.2在如图所示的情况下试求入射角i在什么范围内的光线都可在此纤维内传递．
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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短文.短文中共有10处错误每句中最多有两处.错误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∧并在此符号下面写出该加的词. 删除:把多余的词用斜线\划掉. 修改:在错的词下划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. Ilikeridingmybike.Thoughitisnotverynewbutitismybestfriend.Ifindveryconvenienttogoanywherewithabike.Ridegivesmenotonlyexercisebutalsopleasure.Iusemybikemostlyonsummerwhentheweatheriswarmanddry.Itcanveryunpleasantinwinterwhenitiscoldandrainispouringdown.Itcanalsobeverydanger.OfcourseIwillbeverycarefulonmybike.Infactsaccidentsarenottheonlyproblem.OnedayIwenttoschoolandcomebacktofindhisfrontwheelwasmissing.Itwasalongwalktotherepairershop.NowIhavetwostronglocks.
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Iusedtobelievepolitenesswasathingofthepast.VeryseldomhaveI1apolitehumanbeinginthismodernsociety.HoweverIhadto2mythinkingwhenIwithtwoofmygrown﹣updaughterscamefacetofacewithsuchagentlemaninacoffeeplace.Theplacewas3withcustomersandwehadtoclimbsteepstairstofindanemptytable.4enjoyingcoffeeandsnackswewentdownthe5stairswheretherewashardlyanyspaceforanotherpersontoeither6orcomedown.JustasIwasinthemiddleofmydescent下楼agentlemanenteredthemainentrancewhichwas7infrontofthestaircase.IwassureIwouldbe8roughlybythismangoingup.IkeptcomingdownasfastasIcould.Mysmartdaughterswerealreadydownlookingupatme9hopingIwouldreachthembeforethestrangerstartedupthestairsknowingIwasa10sort.11reachingmydaughtersInoticedthemanstillstandingnearthedoor.Ireachedthemandpassedthe12attheentrancedoorwhichhe13holdingopen.Ilookedbackthinkinghewasstillatthedoordecidingwhethertogoin14findanotherlesscrowdedplace.IsawhimgoingupthestairsandItoldmydaughtersaboutit.Wethreefelt15thatwedidnoteven16thepolitegentlemanwhowasactually17thedooropenforusladies.We18hiskindnessforsuchwell﹣manneredpeopleare19tofindthesedays.20Irememberthisgentlemanandpraythattherewillbemorehumanbeingslikehim. 1.A.broughtup B.turneddown C.appealedto D.comeacross 2.A.shape B.change C.confirm D.identify 3.A.provided B.equipped C.packed D.spotted 4.A.After B.Before C.When D.Upon 5.A.wide B.high C.low D.narrow 6.A.turnaround B.setoff C.goup D.reachout 7.A.much B.right C.closely D.directly 8.A.injured B.pushed C.arrested D.denied 9.A.delightedly B.worriedly C.heartily D.sadly 10.A.genuine B.pessimistic C.nervous D.dynamic 11.A.Nearly B.Hardly C.Slightly D.Previously 12.A.daughters B.waiter C.manager D.stranger 13.A.kept B.avoided C.enjoyed D.resisted 14.A.and B.but C.so D.or 15.A.innocent B.sensible C.ashamed D.jealous 16.A.award B.remind C.consult D.thank 17.A.crashing B.holding C.seeking D.forcing 18.A.applauded B.distinguished C.commented D.witnessed 19.A.rare B.easy C.unlikely D.common 20.A.Ingeneral B.Atlength C.Atlast D.Tillnow
California'sRedwoodNationalPark Standinthemiddleofthevastredwoodforestsandyoumayfeellikeyouhavesteppedbackintime.It'shardnottobeamazedwhenyou'restaringatEarth'stallestlivingthings.Andthatfeelingcontinueseverywhereinthepark.Whetherwalkingalongthebeachesorhikinginthewoodsvisitorsareinaweofthenaturalsurroundingsvariouswildlifeandquietpeace. ●History: Old﹣growthredwoodforestsusedtocovermorethan2000000acresoftheCaliforniacoast.Atthattimeabout1850NativeAmericanslivedinthenorthernareauntillumbermen伐木工人discoveredit.Manytreeswerecutdown.In1918theSave﹣the﹣RedwoodsLeaguewasformedinanefforttoprotecttheareaandby1920manystateparksweresetup.RedwoodNationalParkwascreatedin1968eventhoughabout90%oftheoriginalredwoodtreeshadalreadybeencutdown. ●WhentoVisit: Summersarewarm.Itisthebusiesttimeoftheyear.Wintersarecoolandprovideadifferentkindofvisit.Ifyouenjoybird﹣watchingplanyourvisitduringthespring.Youmayalsowanttoconsideravisitduringthefalltocatchtheamazingfallenleaves.. ●GettingThere: ForthosedrivingintotheparkyouwilluseU.S.Highway101whetheryouaretravelingfromthenorthorsouth.IfyouaretravelingfromthenortheasttakeU.S.Highway199fromSouthForkRoadtoHowlandHillRoad. ●Fees/Permits: Oneofthebestthingsaboutthisnationalparkisit'sfreetovisit!That'sright!ThereisnoentrancefeeforRedwoodNationalPark.Howeverifyouplanoncampingintheparkfeesandreservations预约arerequired.Call800﹣444﹣7275formoreinformation. 25.TheunderlinedpartinaweofinParagraph1probablydescribesafeelingof. A.sadness B.loneliness C.amazement D.satisfaction 26.WhenRedwoodNationalParkwascreatedin1968. A.peoplebegantorealizethevalueofredwoods B.therewerefewold﹣growthredwoodslet C.old﹣growthredwoodforestscametolight D.NativeAmericansstilllivedinthearea 27.WhatcanwelearnaboutRedwoodNationalPark? A.Itisag7eatplacetovisitanytimeoftheyear. B.Thereisonlyonehighwayleadingtothepark. C.Visitorscancampintheparkforfree. D.ItisthefirststateparkintheUSA. 28.Thetextismostprobablytakenfrom. A.atravelguide B.ahistorypaper C.anewspaperreport D.ageographytextbook.
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3分He'sverykind.Wheneverweaskhimquestionshe'swithus. A.angry B.popular C.patient D.strict
太阳光通过三棱镜时在竖直放置的屏幕上形成如图所示的光带NP忽略三棱镜对各色光的吸收．若将灵敏温度计的测温端放在屏幕上的MNNPPQ区域时在哪个区域上升的示数最大
WhenIwasinfourthgradeIworkedpart﹣timeasapaperboy.Mrs.Stanleywasoneofmycustomers.She'dwatchmecomingdownherstreetandbythetimeI'dbikeduptoherdoorstepthere'dbeacolddrinkwaiting.I'dsitanddrinkwhileshetalked. Mrs.StanleytalkedmostlyaboutherdeadhusbandMr.StanleyandIwentshoppingthismorningshe'dsay.Thefirsttimeshesaidthatsoda汽水wentupmynose. ItoldmyfatherhowMrs.StanleytalkedasifMr.Stanleywerestillalive.DadsaidshewasprobablylonelyandthatIoughttositandlistenandnodmyheadandsmileandmaybeshe'dworkitoutofhersystem.Sothat'swhatIdidanditturnedoutDadwasright.Afterawhilesheseemedcontenttoleaveherhusbandoveratthecemetery墓地. Ifinallyquitdeliveringnewspapersanddidn'tseeMrs.Stanleyforseveralyears.Thenwecrossedpathsatachurchfund﹣raiser募捐活动.Shewasspooningmashedpotatoesandlookinghappy.Fouryearsbeforeshe'dhadtoofferherpaperboyadrinktohavesomeonetotalkwith.Nowshehadfriends.Herhusbandwasgonebutlifewenton. IliveinthecitynowandmypaperboyisaladynamedEdnawiththreekids.SheasksmehowI'mdoing.WhenIdon'tsayfineshesticksaroundtohearmyproblems.She'slivedinthecitymostofherlifebutsheknowsaboutcommunity.Communityisn'tsomuchaplaceasitisastateofmind.Youfinditwheneverpeopleaskhowyou'redoingbecausetheycareandnotbecausethey'regettingpaidtodoso.Sometimesit'sgoodtojustsmilenodyourheadandlisten. 1.Whydidsodagouptheauthor'snoseonetime? A.Hewastalkingfast. B.Hewasshocked. C.Hewasinahurry. D.Hewasabsent﹣minded. 2.WhydidtheauthorsitandlistentoMrs.StanleyaccordingtoParagraph3? A.Heenjoyedthedrink. B.Hewantedtobehelpful. C.Hetookthechancetorest. D.Hetriedtopleasehisdad. 3.Whichofthefollowingcanreplacetheunderlinedphraseworkitoutofhersystem? A.recoverfromhersadness B.moveoutoftheneighborhood C.turntoheroldfriends D.speakoutaboutherpast 4.Whatdoestheauthorthinkpeopleinacommunityshoulddo? A.Openuptoothers. B.Dependoneachother. C.Payforothers'help. D.Careaboutoneanother.
下列说法中正确的是A．雷达发射的电磁波是由均匀变化的电场或磁场产生的B．声源与观察者相互靠近时观察者所接收的频率大于声源振动的频率C．电磁波和声波一样在介质中的传播速度只与介质本身有关与频率无关D．在光的双缝干涉实验中若仅将入射光由绿光变为红光则条纹间距变宽
间谍卫星上装有某种遥感照相机可用来探测军用目标这种照相机能拍到晚上关灯行驶的汽车甚至车已经离开也瞒不过它这种遥感照相机敏感的电磁波属于
关于电磁波下列说法正确的是A．变化的电场周围产生变化的磁场变化的磁场周围产生变化的电场两者相互联系统称电磁场B．电磁波谱中最难发生衍射的是无线电波C．电磁波穿过两种介质的分界面时频率不会发生改变D．电磁波在同种介质中只能沿直线传播
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