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小磁计放在两通电螺线管之间，静止时处于如图所示的位置，请完成螺线管B的绕线，并标出电流的方向．
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小磁计放在两通电螺线管之间静止时处于如图所示的位置请完成螺线管B的绕线并标出电流的方向．
两个通电螺线管它们的一端位于图甲中的虚线框内为探究两个通电螺线管之间的磁场方向把一个小磁针分别放在虚
小磁针静止在螺线管的附近闭合开关S.后通电螺线管磁感线方向如图所示则下列判断正确的是
电源的右端为正极
通电螺线管的左端为S.极
小磁针一直保持静止
小磁针N.极向右转动
为探究两个通电螺线管之间的磁场情况某实验小组同学把9个小磁针分别放在两个通电螺线管之间的9个不同点的
10·十堰受通电螺线管产生磁场的作用小磁针静止时处于如图所示的状态请画出螺线管导线的绕向
两个通电螺线管它们的一端位于图甲中的虚线框内为探究两个通电螺线管之间的磁场方向把一个小磁针分别放在
受通电螺线管产生磁场的作用小磁针静止时处于如图10所示的状态请画出螺线管导线的绕向
两个通电螺线管它们的一端位于图甲中的虚线框内为探究两个通电螺线管之间的磁场方向把一个小磁针分别放在
两个通电螺线管它们的一端位于图甲中的虚线框内为探究两个通电螺线管之间的磁场方向把一个小磁针分别放在
1根据图13中通电螺线管的磁感线方向标出小磁针的N.极以及线圈中电流的方向2小磁针在如图14所示的位
小磁计放在两通电螺线管之间静止时处于如图20-6-5所示的位置请完成螺线管B的绕线并标出电流的方向．
小磁针静止在螺线管的附近闭合开关S.后通电螺线管磁感线方向如图所示则下列判断正确的是
电源的右端为正极
通电螺线管的左端为S.极
小磁针一直保持静止
小磁针N.极向右转动
如图所示通电螺线管上方有一静止的小磁针根据图中通电螺线管的磁感线方向判断小磁针的左侧为_______
如图所示虚线框内画出了通电螺线管的端通电螺线管的端以及小磁针在各位置上静止时的指向图中小磁针涂黑的一
小磁针放在两通电螺线管之间静止时处于如图丙所示的位置请完成螺线管B.的绕线并标出电流的方向
如图乙所示小磁针静止在通电螺线管右侧请标出通电螺线管的N.级磁感线方向和小磁针的N.极
为探究两个通电螺线管之间的磁场方向把小磁针放在图6丙所示9个点的位置上方记录小磁针在各位置上的指向如
小磁计放在两通电螺线管之间静止时处于如图所示的位置请完成螺线管B.的绕线并标出电流的方向.
小磁针放在两通电螺线管之间静止时处于如图所示的位置请完成螺线管B的绕线并标出电流的方向．
通电螺线管的右端有一小磁针静止时如图所示请在螺线管两端标出N.S.极磁感线的方向和电源两端的正负极
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2008年北京奥运会的比赛门票开始接受公众预定．下表为北京奥运会官方票务网站公布的几种球类比赛的门票价格某球迷准备用12000元预定15张下表中球类比赛的门票 1若全部资金用来预定男篮门票和乒乓球门票问这个球迷可以预订男篮门票和乒乓球门票各多少张 2若在准备资金允许的范围内和总票数不变的前提下这个球迷想预定上表中三种球类门票其中足球门票与乒乓球门票数相同且足球门票的费用不超过男篮门票的费用问可以预订这三种球类门票各多少张
Alwaysbelievethatsmileattheworldtheworldwillsmilebacktoyou. A.and B.or C.as D.though
InJanuary2016athree﹣episodeTVdocumentaryMastersinForbiddenCitywasbroadcastonChinaCentralTelevision.Itsoonbecamepopular﹣thefirstepisodealonehasbeenwatchednearly1milliontimessofaronthevideowebsitebilibili.com. NowthedocumentaryhasbeenmadeintoafilmandcameoutonDec162016.Itisabouthowprofessionalantiquityrestorers文物修复者intheForbiddenCityrepairancientpaintingscalligraphyclocksandbronzepieces.Itmaynotsoundexcitingbuttherestorers'patienceandtheir100percentfocusoneventhesmallestthingsisenoughtoimpresspeople. Infactmanyoftherestorersareyoungpeople.Ithasalsomadethedocumentarypopularamongtheirpeers同龄人asithasshownthempossibilityofadifferentlifestyle.AfterMastersinForbiddenCitywasbroadcastabout20000peopleappliedtoworkintheForbiddenCity.Mostofthemwerenewcollegegraduates. Thejobhasbecomepopular.Sohavetherestorers.Butwasitdifficulttobepartofadocumentary?Itwasonlysupposedtobedifficultforthedirectornotforus.Wesimplydidourjobspayingnoattentiontoanyoneelsearound.saidShiLiancangoneoftherestorerswhenaskedduringthefilm'spremiere首映inShanghai.Tomakethedocumentarytheproductionteamalsodidfiveyearsofpre﹣researchandfourmonthsofuninterrupted连续的filmingintheForbiddenCity. Indeedtheserestorerskeepthispeacefulstateofmindanddevotethemselvestodoingthesamethingtheydeeplylovedayafterday.AstheposterforthedocumentarysaysChooseacareeranddoitforalifetime. 28.WhatdoesthedocumentaryMastersinForbiddenCitymainlytalkabout? A.DetailedintroductionsofthingsintheForbiddenCity. B.HowrestorersintheForbiddenCityrepairthings. C.LifeofprofessionalantiquityrestorersintheForbiddenCity. D.DifferentkindsofworkersworkingintheForbiddenCity. 29.FromwhatShiLiancangsaidinparagraph4themostimportantqualityoftherestorersshouldbe. A.curiosity B.creativity C.imagination D.attention 30.Whatdoesthedocumentarywanttotellpeople? A.Chooseajobyouloveanddoitwell. B.Workingasanantiquityrestorerisgreat. C.Youngpeopleshouldliveadifferentlife. D.ShootingafilmintheForbiddenCityrequireshardwork.
It'snevertoooldtolearn.KarlMarxbegantolearnEnglishinhis.A.thefiftieth B.fiftieth C.fifty D.fifties
计算2cos30°﹣|﹣1|+﹣1．
已知如图①②在矩形ABCD中AB＝4BC＝8PQ分别是边BCCD上的点． 1如图①若AP⊥PQBP＝2求CQ的长 2如图②若且EFG分别为APPQPC的中点求四边形EPGF的面积．
把多项式8a3﹣2a分解因式的结果是．
抛物线y1＝ax2+bx+c与直线y2＝mx+n的图象如图所示下列判断中①abc＜0②a+b+c＞0③5a﹣c＝0④当x＜或x＞6时y1＞y2其中正确的个数有
Whenyousetoutonyournewjourneyyoushouldn'tforgetyoucamefrom. A.where B.what C.when D.if
已知如图在△ABC中AB＝AC点P是底边BC上一点且满足PA＝PB⊙O是△PAB的外接圆过点P作PD∥AB交AC于点D． 1求证PD是⊙O的切线 2若BC＝8tan∠ABC＝求⊙O的半径．
下列几何体中主视图和左视图都为矩形的是
ThemainreasonIwasalittlenervoustogotoInnerMongoliawasthatIdidn'treallyknowwhattoexpect.HoweverIwasinterestedinthehorseridingarcheryanddeliciousfoodthatIhadheardabout. AlsomyfriendandIwouldbetravellingthereandsleepinginatraditionalMongolianyurtwithcompletestrangers.Iwasworriedaboutthisnewanddifficultexperience. Assoonaswegottothegrasslandsafterourlongfive﹣hourjourneybycarweweregreetedwithsteamingbowlsofheartyMongoliannoodles﹣justwhatweneededtogetusinthemoodtoexplore.Wetookawalkaroundthegrasslandsandweresurprised﹣notonlybytheirbeautybutalsobythestrongwindsthatblewdirtintoourhairandnearlyknockedusoffourfeet. Beforelongitwastimetogohorseriding.IwasworriedbecauseitwasthefirsttimeIhadeverriddenahorse.Ididn'tneedtoworrythough﹣wewereallbeginnersbutthehorsesmadeitveryeasyforus.Howevertheydidhaveahabitofturningaroundandgoingtheotherwayfornoreason! Intheeveningweateanothersimpledeliciousmealofroastlamb.Afterwardswehadastrangetask﹣tocollectdung粪便tomakeafire.Intheendwehadagreattimearoundthecampfirethateveninglisteningtomusicandsharingstoriesofourdaywithstrangers.Thatwasthemostexcitingpartofourtrip. Thenwewenttosleepinouryurt.Becausewewereinthegrasslandsthetemperaturedroppedsharplyatnighttoaroundzerosowefeltcoldthroughoutthenighteventhoughsixotherpeopleweresleepingwithus. ThenextdaywewokeupstillfeelingtiredandheadedbacktoHohhotcapitalofInnerMongoliaautonomousregion.Wereallylovedthenicehotelroomwesleptinthatnightandtheshowerthatwashedthedirtoutofmyhair.Howeverwedidn'tregrethavingtheadventureintheInnerMongoliangrasslands. 36.Howdidthewriterfeelbeforethetrip? A.Hefeltnervousaboutexperiencingnewthings. B.Hehadmixedfeelingsaboutthecomingtrip. C.Hecouldn'twaittogoonanadventureintotheunknown. D.Hefeltworriedabouttravellingwithcompletestrangers. 37.ThewriterexperiencedmanythingsinInnerMongoliaEXPECT. A.sleepingintheopenair B.horseriding C.makingafire D.listeningtomusicandsharingstories 38.WhichofthefollowingstatementsisTRUEaccordingtothearticle? A.Thewriterdidnotexpectthewindtobesohard. B.Roastlambwasthewriter'sfavouriteMongolianfood. C.Thewriterthoughtthatcollectingcowdungwasveryunpleasant. D.Sleepingwithothersmadethenightfeellesscoldtothewriter. 39.Whatcanwelearnaboutthewriter'shorseridingexperience? A.Thehorseshadprobablybeentrainedwell. B.Horseridingwasthemostexcitingpartofthewriter'strip. C.Thewriterwaswellpreparedforhishorseridingexperience. D.Thewriter'shorsekeptturningaroundbecausehedidn'tknowhowtocontrolit. 40.Thewriterwrotethisarticlemainlyto. A.showthatitwasthedifficultpartsthatmadehistripgreat B.describewhatInnerMongoliaisreallyliketoreaders C.tellreaderstobebraveandexploretheunknown D.shareaninterestingtravelexperience
一个袋子中装有3个红球和2个黄球这些球的形状大小质地完全相同在看不到球的条件下随机从袋子里同时摸出2个球则这2个球的颜色相同的概率是．
如图在平行四边形ABCD中AB＜BC． 1利用尺规作图在BC边上确定点E使点E到边ABAD的距离相等不写作法保留作图痕迹 2若BC＝8CD＝5则CE＝．
在△ABC中AB＝13cmAC＝20cmBC边上的高为12cm则△ABC的面积为cm2．
如图△ABC与△ABD中AD与BC相交于O点∠1＝∠2请你添加一个条件不再添加其它线段不再标注或使用其他字母使AC＝BD并给出证明． 你添加的条件是． 证明．
小明在测小灯泡电功率实验中电路图如图甲所示电源电压为8V小灯泡L的额定电压为2.5V正常发光时的电阻约为10Ω可供选用的滑动变阻器R1R2和R3的最大阻值分别为5Ω20Ω50Ω．1为了保证元件安全应该选用的滑动变阻器是选填R1R2或R3．2图乙是根据实验数据绘制的U—I关系图象．由此可知小灯泡的额定功率是W．当滑动变阻器的滑片向左移动时灯丝的电阻将3小明继续向左移动滑片小灯泡发出刺眼的光然后突然熄灭电流表示数变为零那么产生此故障的原因是
下列运算中正确的是
如图在菱形ABCD中∠B＝60°点EF分别从点BD出发以同样的速度沿边BCDC向点C运动．给出以下四个结论 ①AE＝AF ②∠CEF＝∠CFE ③当点EF分别为边BCDC的中点时△AEF是等边三角形 ④当点EF分别为边BCDC的中点时△AEF的面积最大． 上述结论中正确的序号有．把你认为正确的序号都填上
Forthepastfiveyears44﹣year﹣oldRamiAdhamhasspentmuchofhistimehelpingchildreninSyria叙利亚.Hekeepssending16tothem. RamiAdhamwasborninSyriabutmovedtoFinlandwithhisfamilyin1989.WhenSyriancivilwar内战tookplacein2011hedecidedtohelpthechildreninhishometown.Inthebeginninghe17plannedonsendingtoys.Hethoughtfoodmedicineanddrinkingwaterweremore18.OncehisdaughteraskedhimtosendhertoystothechildreninSyria.WhenAdhamgavethetoystothosepoorchildrenhesawthe19ontheirfaces.Fromthenonhemadetoysonthetopofhisgiftlist. Adhamsoonbecamefamous20theFatherChristmasofSyria.HehastravelledfromFinlandtoSyria28times.Andhewon'tstop21thewarends.EverytimehegoestoSyriahecarriesaheavybagoftoysonhisbackallhisway.It'satripfullof22.Hemightgethurtorbekilledatanytimebuthenevergivesup.NowchildreninSyriaarefacingdeathandmanyotherpossiblethreats.Ithinkthetoysarereally23forthechildrenhesaid.Nomatterwhatthey24theyarealwayshappytosharethemwithothers. Adhamishavingafund﹣raisingactivityatpresent.Hewantstoraise100000dollars.Ifitis25heplanstousethemoneytobuildschoolsinSyria.TheworkofAdhamisalightamongthedarknessformanychildreninSyria. 16.A.food B.toys C.money D.medicine 17.A.never B.sometimes C.often D.always 18.A.impolite B.impatient C.important D.impossible 19.A.joy B.sadness C.anger D.fear 20.A.for B.with C.as D.to 21.A.when B.though C.after D.until 22.A.secrets B.safety C.danger D.happiness 23.A.expensive B.valuable C.useless D.hopeless 24.A.remember B.record C.receive D.remind 25.A.necessary B.interesting C.difficult D.successful
﹣Hello!I'dliketospeaktotheCustomerServiceDepartment. ﹣PleaseholdandI'llyourcalltoit. A.lookthrough B.putthrough C.runthrough D.gothrough
如图在一次军事演习中蓝方在一条东西走向的公路上的A处朝正南方向撤退红方在公路上的B处沿南偏西60°方向前进实施拦截红方行驶1000米到达C处后因前方无法通行红方决定调整方向再朝南偏西45°方向前进了相同的距离刚好在D处成功拦截蓝方求拦截点D处到公路的距离结果不取近似值．
﹣CouldyouhelpmedosomecleaningJason? ﹣Certainly.MomwillbecrazyifsheseesthisIthink. A.mess B.menu C.market D.message
﹣MissWhiteIamafraidIhavegotlowmarksintheexam. ﹣dear!Takeiteasy.Iamsureifyoutryyourbestyouwillpassiteasilynexttime. A.You'rewelcome B.Comeon C.Allright D.Welldone
某公司今年销售一种产品一月份获得利润10万元由于产品畅销利润逐月增加一季度共获利36.4万元已知2月份和3月份利润的月增长率相同．设23月份利润的月增长率为x那么x满足的方程为
如图OA＝AB∠OAB＝90°双曲线y＝经过点A双曲线y＝﹣经过点B已知点A的纵坐标为﹣2则点B的坐标为．
1如图1在矩形ABCD中对角线AC与BD相交于点O过点O作直线EF⊥BD且交AD于点E交BC于点F连接BEDF且BE平分∠ABD． ①求证四边形BFDE是菱形 ②直接写出∠EBF的度数． 2把1中菱形BFDE进行分离研究如图2GI分别在BFBE边上且BG＝BI连接GDH为GD的中点连接FH并延长FH交ED于点J连接IJIHIFIG．试探究线段IH与FH之间满足的关系并说明理由 3把1中矩形ABCD进行特殊化探究如图3矩形ABCD满足AB＝AD时点E是对角线AC上一点连接DE作EF⊥DE垂足为点E交AB于点F连接DF交AC于点G．请直接写出线段AGGEEC三者之间满足的数量关系．
国家规定“中小学生每天在校体育活动时间不低于1小时”．为此某市就“你每天在校体育活动时间是多少”的问题随机调查了辖区内300名初中学生．根据调查结果绘制成的统计图部分如图所示其中分组情况是 A组t＜0.5hB组0.5h≤t＜1hC组1h≤t＜1.5hD组t≥1.5h 请根据上述信息解答下列问题 1C组的人数是 2本次调查数据的中位数落在组内 3若该辖区约有24000名初中学生请你估计其中达国家规定体育活动时间的人约有多少
如图所示在正方形网格中每个小正方形的边长都是1每个小格点的顶点叫做格点以格点为顶点分别按下列要求画三角形． 1使三角形的三边长分别为32． 2使三角形为边长都为无理数的钝角三角形且面积为4．
WhenyoutravelabroadyoucanhardlyavoidproductsmadeinChina. A.tobuy B.buy C.buying D.bebought
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