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下列四个数中,2019的相反数是( )
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下列叙述正确的个数是①表示互为相反数的两个数的点到原点的距离相等②互为相反数的两个数和为0③互为相反
1个
2个
3个
4个
下列四个数中其相反数是正整数的是
3
下列说法中错误的有①若两数的差是正数则这两个数都是正数②若两个数是互为相反数则它们的差为零③零减去任
0个
1个
2个
3个
实数abcd在数轴上的对应点的位置如图所示则这四个数中相反数是正数的为
a
b
c
d
下面说法正确的有①的相反数是-3.14②符号相反的数互为相反数③--3.8的相反数是3.8④一个数和
0个
1个
2个
3个
下面说法正确的有①π的相反数是﹣3.14②符号相反的数互为相反数③﹣﹣3.8的相反数是3.8④一个数
0个
1个
2个
3个
下列说法中正确的是
在数轴上表示-a的点一定在原点的左边
有理数a的倒数是
一个数的相反数一定小于或等于这个数.
如果一个数的绝对值等于这个数的相反数,那么这个数是负数或零
下面说法正确的有①的相反数是-3.14②符号相反的数互为相反数③--3.8的相反数是3.8④一个数和
0个
1个
2个
3个
在2-286这四个数中互为相反数的是
-2与2
2与8
-2与6
6与8
下列四个数中2019的相反数是
﹣2019
﹣
2019
0
下列说法中不正确的是
一个数与它倒数之积是1
一个数与它的相反数之商为-1
两个数的商为-1,这两个数互为相反数
两个数的积为1,这两个数互为倒数.
下列四个数中2019的相反数是
﹣2019
﹣
2019
0
下列说法不正确的是
一个数(不为0)与它的倒数之积是1
一个数与它的相反数之和为0
两个数的商为﹣1,这两个数互为相反数
两个数的积为1,这两个数互为相反数
下列说法中正确的是
一个数的相反数是负数
一个数的绝对值一定不是负数
一个数的绝对值一定是正数
一个数的绝对值的相反数一定是负数
下列说法中正确的是
正数和负数互为相反数
任何一个数的相反数都与它本身不相同
任何一个数都有它的相反数
数轴上原点两旁的两个点表示的数互为相反数
下列说法中错误的是
在一个数前面添加一个“﹣”号,就变成原数的相反数
﹣
与2.2互为相反数
如果两个数互为相反数,则它们的相反数也互为相反数
的相反数是-0.3
下列结论正确的有①任何数都不等于它的相反数②符号相反的数互为相反数③表示互为相反数的两个数的点到原点
2个
3个
4个
5个
下列四个数中2019的相反数是
﹣2019
﹣
2019
0
下列说法①有理数的绝对值一定是正数②一个数的绝对值的相反数一定是负数③互为相反数的两个数必然一个是
0个
1个
2个
3个
下面说法正确的有①的相反数是-3.14②符号相反的数互为相反数③--3.8的相反数是3.8④一个数和
0个
1个
2个
3个
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8分FoodpickedupjustafewsecondsafterbeingdroppedislesslikelytocontainbacteriathanifitisleftforlongerperiodsoftimeaccordingtothefindingsofresearchcarriedoutatAstonUniversity'sSchoolofLifeandHealthSciences.Thefindingssuggesttheremaybesomescientificbasisofthe5﹣secondrule﹣thebeliefaboutitbeingfinetoeatfoodthathasonlyhadcontactwiththefloorforfivesecondsorless.Althoughpeoplehavelongfollowedthe‘5﹣secondrule'untilnowitwasunclearwhetheritactuallyhelped. ThestudyundertakenbyfinalyearBiologystudentsandledbyAnthonyHiltonProfessorofMicrobiologyatAstonUniversitymonitoredthetransferofthecommonbacteriafromavarietyofindoorfloortypesascarpetcementfloortotoastpastabiscuitandastickysweetwhencontactwasmadefrom3to30seconds.Theresultsshowedthattimeisasignificantfactorinthetransferofbacteriafromafloorsurfacetoapieceoffoodandthetypeofflooringthefoodhasbeendroppedonhasaneffectwithbacterialeastlikelytotransferfromcarpetedsurfacesandmostlikelytotransferfromcementflooringsurfacestomoistfoodsmakingcontactformorethan5seconds.ProfessorHiltonsaidConsumingfooddroppedonthefloorstillcarriesaninfectionriskasitverymuchdependsonwhichbacteriaarepresentontheflooratthetime. TheAstonteamalsocarriedoutasurveyofthenumberofpeoplewhoemploythe‘five﹣secondrule'.Thesurveyshowedthat87%ofthepeoplesurveyedsaidtheywouldeatfooddroppedonthefloororalreadyhavedoneso.55%ofthosethatwouldorhaveeatenfooddroppedonthefloorarewomen.81%ofthewomenwhowouldeatfoodfromthefloorwouldfollowthe‘5﹣secondrule'.ProfessorHiltonaddedOurstudyshowedthatasurprisinglylargemajorityofpeoplearehappytoconsumedroppedfoodwithwomenthemostlikelytodoso.Buttheyarealsomorelikelytofollowthe‘5﹣secondrulewhichourresearchhasshowntobemuchthananoldwives'tale. 12.Accordingtothepassagewhichofthefollowingistrue A.Atoastdroppedonthecarpetiseasiertobepollutedthanthatdroppedonthecementfloor. B.Astickychocolatedroppedonthecarpetiseasiertobepollutedthanthatdroppedonthecementfloor. C.Thefooddroppedonthecarpetsharesthesamepotentialofbeingpollutedwiththefooddroppedonthecementfloor. D.Thefooddroppedonthecementfloorisnotassafeasfooddroppedonthecarpetwithin30seconds. 13.Whatisthepassageprobablydeveloped A.Contrast B.Example C.Time D.Space 14.HowdidProfessorHiltonfeelafteranalyzinghowmanypeoplechosetoeatdroppedfood A.Puzzled B.Upset C.Satisfied D.Astonished 15.Whatisthemainideaofthispassage A.Thefoodwhichisdroppedonthefloorcanbeeatensafely. B.Aresearchonthesafetyoffooddroppedonthefloorisundertaken. C.Thebacteriahavenonegativeeffectonthesafetyoffood. D.Peoplesurveyedintheresearcharewillingtoaccepttheidea.
8分Itisbelievedthatthesuccessofhumansasaspeciesdependstoalargeextentonourabilitytocooperateingroups.Muchmoresothananyotheranimalpeopleareabletocoordinateandjointheirforcesandactionstoproducemutual共同的benefits. NewresearchinvolvingDrLucasMollemananexpertattheUniversityofNottinghamsuggeststhatsuccessfulcooperationingroupsdependsonhowpeoplegatherinformationabouttheirpeersandhowtheybasetheircooperativedecisionsonit. BiologistswonderhowcooperationcouldhavedevelopedbynaturalselectionItispuzzlinghowcooperationcanbebeneficialwhenitispossibletobehaveselfishlyandtakeadvantageofthecooperativeeffortsofyourgroup.Psychologistsandeconomiststryhardtounderstandwhymanypeoplearewillingtosacrificetheirownwelfaretobenefittheirsocialenvironment. DrMollemanfromthecenterforDecisionResearchandExperimentalEconomicssaidThequestionthatourresearchtriestoansweris‘Howdopeoplemakedecisionswhentheiractionscanaffectthewelfareofothers'Morespecificallywewanttoknowhowpeopledeterminetheirbehaviorwhentheyhavetocooperateingroups.Inthesesituationsabeneficialoutcomeforthewholegroupcanbeachievedifeveryonecooperates.Individuallyhoweverpeoplemightbebetteroffbymakingselfishchoices.Itispossiblethatpeoplepaycloseattentiontotheirfellowgroupmateswhentheymakedecisions.Forinstancetheycooperateifothersalsocooperatebutactselfishlywhenothersdonotcooperate. DrPieterVanDenBergfromtheUniversityofGroningensaidFrompreviousresearchweknowthatsomepeopleare‘majority﹣oriented以多数人为方向的'andtendtolookatthebehaviorofthemajorityintheirgroupwhereasothersare‘success﹣oriented'andtrytofindoutwhatkindofbehaviorpaysoffbestforthemselves. DrMollemansaidItturnsoutthatbehavioringroupsofsuccess﹣orientedpeoplewasmuchmoreselfishthanitingroupsofmajority﹣orientedpeople.Asaconsequencethepeopleinthemajority﹣orientedgroupstendedtoearnmoremoneyintheexperimentsincetheycooperatedmore. 28.Accordingtothepassagewhatisspecialabouthumanbeing A.Theyarelikelytocommunicatewellwithothers. B.Theyarecapableofworkingtogetherwithothers. C.Theyarestrongtosurvivesomenaturaldisasters. D.Theyareeasytogetaccesstovariousinformation. 29.Whatdoestheunderlinedworditinparagraph2referto A.Research. B.Cooperation. C.Information. D.Group. 30.TheauthorwritesParagraph4to. A.letusknowhowpeoplemakecooperativedecisions B.showustheimportanceofcooperativedecisions C.tellushowtomakeotherpeoplecooperateinagroup D.remindusoftheadvantagesofcooperatingwitheachother 31.Fromthepassagewecaninferthat. A.peoplearemoreconcernedaboutwhichgrouptheyaresupposedtoselect B.theeffortsofsuccess﹣orientedpeoplearemorelikelytopayoff C.peoplemakeawisedecisionbasedonobservingothers'behaviorscarefully D.peopleperformdifferentlywhentheymakedecisions.
10分Unlessyouthinkyou'rethesmartestwhodoesn'twanttobesmarterOfcourseIwanttobesmartertoo.SoItrytofindoutwho'stherealsmartguythatmaybeIcanlearnfrom.36 ▲Theyprobablydosocialmedia.Notalwaysbutprobably.37Theyalsousethistoensuretheycanfeedtheirbrainswiththingstheyotherwisewouldn'thavecomeacross. ▲38Theyneverbothertheirheadabouttheproblemofwork﹣lifebalanceandsomehowmanagetoseem100%engagedinwhatthey'redoingonallfrontssimultaneously同时eventhoughyouknowthey'retakingappropriatestepsbehindthescenestomakesuretheirlivesarewellbalanced. ▲Theyknowtheyarethesmartestintheroombuttheydon'tspendmuchtimetalkingaboutthat.39Thatistheychallengethemselvestomakeeveryoneelseintheroomthesmartestpersontoo. ▲Theynevereverunderanycircumstancesmakeyoulookstupideventhoughitwouldbeeasytodoso.They'velearntthroughbitterexperiencethattheonlythingthathappenswhenyoumakesomeonelookbadisthatyoulookbadyourself. ▲Iftheyaremanagerstheywillmakeeveryefforttogetpeoplemoreconnectedandmorepopularthanthemintheirteams.40They'renotthreatenedbecausetheyknowthatsmartnessissynergistic相互促进的. A.It'snotonlyachancetolisten. B.Theyknowitisanadvantagetothem. C.Theytakeitasapersonalchallengeinstead. D.Theywillbesmilingevenwhenthingsgowrong. E.NowI'vegotanansweraboutwhethersomeone'ssmart. F.Theyalsoensuretheirsmartpeoplelooksmarterthanthem. G.Theydealwithhomeworkandpersonalinterestsperfectly.
如图中A~H是教案备课库常见的物质.A俗称苏打C可用作补钙剂G是一种常见的氮肥含氮量为35%HF物质类别相同.图中“﹣”表示两端的物质间能发生化学反应“→”表示物质间存在转化关系反应条件部分反应物和生成物已略去. 1写出化学式AGD. 2写出H转化为B的反应化学方程式. 3若E与G的组成元素相同则E的名称为.
重铬酸钾是一种有毒且有致癌性的强氧化剂它被国际癌症研究机构划归为第一类致癌物质.重铬酸钾K2Cr2O7中Cr元素的化合价为
分类是我们学习化学的一种简单易行的科学方法下列关于物质的分类正确是
根据氯离子的结构示意图判断以下说法错误的是
10分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. Todayismymum'sbirthday.ThisafternoonIwenttothebiggestshoppingcenterdowntownandbuyapresentforher.ThenItookthesubwayhome.SittingonthetrainIthoughtmymumwouldveryhappywhenshesawthepresent.Atthenextstationanoldmanthatcarriedtwoheavybagsgotonthetrainbutstoodinfrontofme.Helookedtired.Ihesitatedforthemomentandthenofferedmyseattoher.Theoldmanthankedmealotofandsatdown.SeeinghissmileIfelthappily. FromthisexperienceIwillbereadytohelpingothersinthefuture.
10分 HowtoCreateaMindMap Mostofusthinkvisuallybutwewritetextually.36Italsomakestheinformationwelistmoredifficulttoprocessrememberandshare. 37Itcombinesthebrain'svisualnaturewithourtendencytowritedownwords.Weendupwithadiagramthatcombineslogicandorderinalessstructuredmanner.Thispromotesclearerthinkingandbettercomprehension.38 SohowdoyoucreateamindmapThemostbasicmethodistojustuseapenandpaperoramarkerandwhiteboard.Itbeginswithacentraltopicorideathenflowsoutward.39Thenextleveloftopicsisrepresentedbybranchesextendingfromit. Therearen'treallyanyrulesforcreatingmindmaps.Whilemostflowoutwardlyfromthecentraltopicsomeusersprefertobuildmindmapsinonedirection.40Thiscanmakegroupsofideaseasiertoidentifyandremember.Italsomakesamindmapmoreenjoyabletocreateanduse. Mindmapsareextremelyeffectivefortakingnotesplanningaprojectbrainstorminganideapresentinginformationtoothersandmanyotheruses.Takeoutyourpenandhaveatry. A.Theyhelptoclarifythinking B.Thisgoesagainsthowourmindsactuallywork C.Theyhelpussavetimebyfocusingonkeyissues D.Amindmapistheperfectanswertothisdilemma E.Thinkofitasatreewherethecentralpointisthetrunk F.It'salsoalotmoreenjoyablethansimplywritingdownlists G.Otherliketoaddcolorspicturesorsymbolsintheirmindmaps.
向硝酸银硝酸铜硝酸亚铁的混合溶液中加入一定质量的锌粉反应停止后过滤得滤渣A和滤液B.向滤渣A中加入稀盐酸有气泡冒出.则滤渣A中一定有滤液B中一定有的金属离子是一定没有的金属离子是.
下列实验操作正确的是
15分Therewasagardenerwholookedafterhisgardenwithgreatcare.Towaterhisflowersheusedtwobuckets.Onewasashinyandnewbucket.Theotherwasaveryoldandworn﹣outone61hadseenmanyyearsofservicebutwasnowpastitsbest. Everymorningthegardenerwouldfillupthetwobuckets.Thenhewouldcarrythemalongthepathoneon62sidetotheflowerbeds.Thenewbucketwasveryproudofitself.Itcouldcarryafullbucketofwater63asingledropspilled.Theoldbucketfeltvery64shamebecauseofitsholesbeforeitreachedtheflowerbedsmuchwater65escapefromtheholes. SometimesthenewbucketwouldsaySeehowcapableIam!Howgooditisthatthegardenerhasmetowatertheflowerseveryday!Idon'tknow66hestillbotherswithyou.Whatawasteofspaceyouare! AndallthattheoldbucketcouldsaywasIknowI'mnotveryusefulbutIcanonlydomybest.I'mhappythatthegardenerstillfindsalittlebitofuseinmeatleast. Onedaythegardenerheardthatkindofconversation.After67watertheflowersasusualhesaidYoubothhavedoneyourworkverywell.NowIamgoingtocarryyouback.Iwantyoutolook68carefulalongthepath. Thenthetwobucketsdidso.Allalongthepaththeynoticedonthesidewherethenewbucket69carrytherewasjustbareearthontheothersidewheretheoldbucketpassedtherewasa70joyrowofwildflowersleadingallthewaytothegarden.
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