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任何两个数的积不一定比商大． ．
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下列说法正确的是
减去一个数，等于加上这个数
零减去一个数仍得这个数
两个相反数相减得零
在有理数加法或减法中，和不一定比加数大，被减数不一定比减数或差大
任何一个关系一定至少有一个主码这个结论
不正确
不一定正确
正确
至少有两个
两个数相除商不一定小于被除数判断对错
下列语句中正确的个数是______.①关于一条直线对称的两个图形一定能重合②两个能重合的图形一定关于
下面说法正确的是
一个数乘小数，积不一定小于这个数
两个数的积不是小数，这两个数也一定不是小数
无限小数比有限小数大
两个数相乘积不一定大于被乘数．．判断对错
任何两个数的积不一定比商大．．
两个数相除商不一定大于被除数．．
两个数的积一定大于这两个数两个数的商一定小于这两个数．．判断对错
水泵的比转速和转速是两个不同的概念比转速大的水泵其转速
大
小
不一定高
稳定
下列说法中正确的是
任何一个数都有平方根
任何正数都有两个平方根
算术平方根一定大于0
一个数不一定有立方根
一个数除以分数的商不一定比原数大．．判断对错
动画线条技术要求中线条与线条的衔接要紧尤其画物体的外轮廓线和两个不同色块的分割线时线条要封口
不一定不一定
不一定一定
一定不一定
一定一定
下列说法正确的是
两个数之差一定小于被减数
减去一个负数，差一定大于被减数
减去一个正数，差不一定小于被减数
0减去任何数，差都是负数
一个数除以真分数商不一定比这个数大．．判断对错
两个数相除商不一定小于被除数判断对错
任何两个颜色只要它们的三刺激值不同这两个颜色就
相同
不同
不一定
以上都对
下列结论中正确的是
有理数减法中，被减数不一定比减数大
减去一个数，等于加上这个数
零减去一个数，仍得这个数
两个相反数相减得0
下列句子中正确的是
在有理数加法或减法中，和不一定比加数大，被减数不一定比减数大
减去一个数等于加上这个数
零减去一个数，仍得这个数
两个相反数相减得零
两个因数相乘的积不一定比这两个因数都大．．判断对错
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Areyoutrulyhappy?Doyoueverknowwhatitmeanstobehappyandwhatittakestoachievehappiness?1.ThefollowingareafewtipsthatIfollowtocreatehappinessinmylife.※Makeaplanforachievinggoalsthatyoubelievewillmakeyouhappy.Yourmoodswillverylikelyincreaseifyouaregoingaftersomethingyouvalue.※Surroundyourselfwithhappypeople.Itiseasytobegintothinknegativelywhenyouaresurroundedbypeoplewhothinkthatway.2.※Whensomethinggoeswrongtrytofigureoutasolutioninsteadofbeingabsorbedinselfpity.Trulyhappypeopledon'tallowsetbackstoaffecttheirmoodbecausetheyknowthatwithalittlethoughttheycanturnthecircumstancesbacktotheirfavor.※3.Thesefewminuteswillgiveyoutheopportunitytofocusonthepositivethingsinyourlifeandwillleadyoutocontinuoushappiness.※4.Whetheryoutreatyourselftolunchtakealongrelaxingbathorsimplyspendafewextraminutesonyourappearanceyouwillbesubconsciously下意识地puttingyourselfinabettermood.※Findingthehumorinsituationscanalsoleadtohappiness.Findawaytomakelightofasituationthatwouldotherwisemakeyouhappy.※Keepinghealthyisanotherwaytoachievehappiness.5.A.Whatmakesonepersonhappymaybeverydifferentfromwhatmakessomeoneelsehappy.B.Onthecontraryifyouarearoundpeoplewhoarehappytheiremotionalstatewillbeinfectious.C.Beingoverweightornoteatingnutritiousfoodscanhaveanegativeeffectonyourmood.D.Theseareimportantquestionsforanyonewhoisseekinghappinesstoaskthemselves.E.Spendafewminuteseachdaythinkingaboutthethinsthatmakeyouhappy.F.Therearesometipsinlifethatleadtohappiness.G.It'salsoimportanttotakesometimeeachdaytodosomethingniceforyourself.
Todaywebringyouanoldtale.It'sthestoryofthethreelittlepigsandthebigbadwolfthatblewdownahousemadeofstrawandonemadeofsticks.Theonlyhouseleftstandingwastheonemadeofbricks.Nowthereisnewevidencetosuggestthathousesbuiltwithbalesofstrawcanbeverystrong.Theyarealsoveryenvironmental.PeteWalkerisaprofessorattheUniversityofBathinBritain.Heandateamofresearcherstherehavebuiltahousemadeoutofstrawbalesandhempmaterial.Duringthenexttwelvemonthstheteamwillstudytheeffectivenessofthesematerialsinhomebuilding.ProfessorWalkersaystherearemanygoodreasonsforusingstraw.ProfessorWalker'Oneofthebenefitsisit'sarelativelyinexpensiverenewablematerialthat'sreadilyavailable.'Healsoagreesthatstrawtakesincarbondioxideasitgrowsandhelpstheenvironmentinotherways.Soitcanbeseenashavingnoharmfuleffectsontheenvironment.ProfessorWalker'Thestrawbalewallsarerelativelythckandsoallthatstrawprovidesverygoodthermalinsulation.Sowemakebuildingsthatrequireverylittleheatinginthewinterorindeedverylittlecoolinginthesummer.Sotheyrequireverylittleadditionalenergy.'ProfessorWalkersaysthisreduceshomeoperatingexpenses.Italsoreducestheeffectontheenvironment.Hesaysthecurrentinterestinstrawbalehousesisadirectresponsetotheproblemofclimatechange.DavidLanfearownsaneco﹣friendlyhomebuildingserviceintheUnitedStatescalledBaleonBaleConstruction.Hesayshelaughedwhensomefriendsfirsttoldhimabouthousesbuiltofstraw.Butafterdoinghisownresearchhelearnedthatbuildingwithstrawbalesmadealotofsense.Hehasnowhelpedtobuildmorethantenstrawbalehousesandsaysthebuildingmaterialisbecomingmorewidelyaccepted.Tobuildthehouseshefillsawoodframewithtightlypackedbalesofstraw.Nexthecoatsthewallsinsideandoutwithlayersofclayplaster.Hesaysthecommonideasaboutstrawhousescontinueincludingstoriesaboutthethreatoffire.Mr.Lanfearsaysstrawbalehouseshavedonewellwhentestedforfireresistance.Andhesayshisbuildersusethesamebuildingmethodsastraditionalbuilderstokeepoutrain.DavidLanfear'Weusewhatwecallgoodshoesandagoodhatandthatwouldbeasolidfoundationandareallygoodroof.'1What'sDavidLanfear'sattitudetowardsthestrawhousesatlast?A.Ridiculous.B.Approving.C.Defensive.D.Unbelievable.2Whatcanweinferfromthepassage?A.Usingstrawtobuildhousesisdearerthanusingbricks.B.Thehousesbuiltwithbalesofstrawarestrongerthanthosebuiltwithbricks.C.Strawwhichisconvenienttogetismuchcheaperthanthickbricks.D.Housesmadeofbricksarenobetterthanthosemadeofstraw.3Accordingtothepassageweknowthat.A.thereissomeexperienceinbuildingthestrawhousesB.thehousemadeofstrawbalesisthesameasthetraditionaloneC.thehousemadeofstrawbalesisstillunderresearchD.it'suncertainthatthestrawhousecanbeverystrong
I'vecheatedinschoolwhenIthoughtthatIcouldgetawaywithit.I'mnotproudofitandIdon'tusuallyfeelverygoodaboutmyselfafterwardsbutsometimesit'stheonlywaypossibletosurviveinapressurecooker.Myparentsarereallysetonmygettinggoodgrades.Theystudymyreportcardthesamewaytheyexaminethenewspaper'sstockmarketpage.AndtheymakemefeelthatI'vegottoliveuptotheirexpectations.Butoftenit'slikeeachteacheractsasifhisistheonlysubjectwehave.Theythinknothingofpilingonourhomeworkorgivingsurprisequizzes.Sometimeswehavetotaketwoorthreetestsindifferentsubjectsonthesameday.I'dliketoseealotofadultsIknowpreparingforthat.Whenthepressurebecomestoohighsomekidsmayresortto诉诸于cheating.Ifyouhavethreeorfoursubjectstostudyforyou'renotgoingtobeabletodevoteenoughtimetoeachsubjectinordertobewellpreparedforeachclass.Besidesitmaybetheonlywaylefttoliveuptoyourparents'expectationsandcompetewiththetopstudentsintheclass.Everybodyknowsthatifyoucheatit'simportantnottogetcaught.Fewthingscancausemoreofchaos.Oncemyelderbrothergotcaughtcheatingonamathfinal.Myparentsactedasthoughhe'dcommittedafederalcrime.TheassistantprincipalcalledthemtoschoolbutalthoughtheincidentcausedseveralconferencesIdon'tthinkthatanybodyeverreallyunderstoodwhatmybrotherwasgoingthrough.We'rejustsupposedtoperformoutstandinglyaswellasalwaysacthonestlybuthowmanyadultscanactuallyliveuptothestandardstheysetforus?Myfatherhasgottencountlesstrafficticketsforparkinginnoparkingzonesorfornotcomingtoafullstopatstopsigns.Andyou'vealwayshearingaboutpeoplewhodon'tfiletheirincomestaxhonestly.Howaboutallthecorruptioningovernment?Successfuladultsoftenacceptdishonestyinordertoachievetheirbusinessgoals.Arekidstheonlyoneswhoaresupposedtobeperfect?Mostofmyfriendshavecheatedontestsinschoolatonetimeoranother.Thekidswhonevercheatedareusuallyeitherafraidofgettingcaughtorjustdon'tknowhowtodoitsafely.Nobodywantstocheat.Butifit'sachoiceofbeinghonestorofgettingabettergrademostkidswilltryforthelatter.Thatmaysoundwrongbutwedidn'tmaketheruleswe'rejusttryingtogetby.1Whatisthebesttitleofthispassage?A.Everyonecanfightacheat!B.Everyonelikestocheat!C.Cheatingisreasonable!D.Noonewantstocheat!2eauthoroweschildren'scheattothefollowingEXPECT.A.parentsB.childrenC.teacherD.examinations3thefifthparagraphtheauthormainlywantstosay.A.someadultscannotliveuptothestandardstheysetforthechildrenB.kidsarealwayssupposedtobeperfectC.hisfatheralwayscheatsinhislifeD.childrenshouldn'tlearnfromsuccessfuladults4Whichofthefollowingistrueaccordingtothispassage?A.Theauthorthinksitischildren'srighttocheatinschool.B.Mostoftheauthor'sfriendslikecheatingonthetestsinschool.C.Theauthorthinksitwrongtocheatinschool.D.Theauthorshowsapositiveattitudetowardsasurprisequizinschool.
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AfterashortvacationwithmyparentsIreturnedtothecountrywhereI'mvolunteering.ThenextdayIwasbackatmydesk.AndIwas1surprisetofindthatthesmilecardsIorderedwhileIwasawayhadarrived.Thoughtsofhowtousekindactstohelpthoseinneedbegandancinginmyhead2mademydayimmediatelylightup.ThefollowingdaysItookasmallpurseandasmilecardwithmewiththeintentionofgivingittosomeonewho3realneededabigsurprise.Marthaisaladyasinglemotheroffour4childwhocleansourofficegivesusteafoodetc.OnedayIfoundherintheofficetouchingherheadinexhaustionassheended5phonecall.AftertalkingwithherIlearnedthatoneofherchildren6sendbackhomefromschoolbecause7non﹣paymentoffeesandthatshehadjustbeenarrangingforthemoney.SoIdecided8helpmyfirsttargetMartha!WhenshewenttogetlunchIleftherthegiftinabagwithhernameasmilecardandabigsmile9drawonthebag.Later10Marthasawmeagainshesaid'Thankyouverymuch!Youmademyday.'
三角形的内角和是四边形的内角和是．
圆的周长总是它直径的π倍．．判断对错
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工业上常用铝土矿主要成分为Al2O3SiO2和Fe2O3等杂质为原料制备铝氢化钠铝氢化钠NaAlH4是有机合成的重要还原剂工艺流程如图 已知SiO2在“碱液”中转化为铝硅酸钠Na2Al2SixO8沉淀． 1过量NaOH溶液溶解铝土矿时为了提高浸出率使所有要提取的金属尽量溶解可采取的措施是．任写一种 2写出Al2O3被过量的NaOH溶液溶解的离子方程式． 3操作1和操作2使用的操作方法是． 4一定条件下往铝中通入纯净Cl2反应会生成填写化学式已知该物质是由分子构成不含离子则相邻原子间形成的化学键为键该物质与NaH反应生成NaAlH4和一种与厨房中常用的调味品成分相同的物质反应Ⅰ请写出反应Ⅰ的化学方程式．
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