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如图(a)，线圈ab、cd绕在同一软铁芯上。在ab线圈中通以变化的电流，用示波器测得线圈cd间电压如图(b)所示。已知线圈内部的磁场与流经线圈的电流成正比，则下列描述线圈ab中电流随时间变化关系的图中...
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如图B-6所示两个线圈绕在同一圆筒上A中接有电源B中导线ab短路.当把磁铁迅速插入A线圈中时A线圈中
如图所示原来静止的圆形线圈通以逆时针方向的电流I.在其直径AB上靠近B点放置一根垂直于线圈平面的固定
硅整流发电机定子总成固定在两端盖之间三相线圈绕在铁芯上线圈按接法连接
如图a线圈abcd绕在同一软铁芯上在ab线圈中通以变化的电流用示波器测得线圈cd间电压如图b所示已
组成的两个线圈必须绕在同一铁芯上
交换器
变频器
互感器
变阻器
关于点火线圈下列说法正确的有
可产生足以在火花塞电极间引燃火花的高电压
初级和次级线圈都环绕在铁芯上
初级线圈的圈数较多
次级线圈的圈数较少
初级线圈绕在次级线圈的外面便于散热
如图所示绕在铁芯上的线圈与电源滑动变阻器和电键组成闭合回路在铁芯的右端套有一个表面绝缘的铜环a下列各
将电键突然断开的瞬间
线圈中通以恒定的电流
通电时，使滑动变阻器的滑片P.做加速移动
通电时，使滑动变阻器的滑片P.做匀速移动
当两个线圈放得很近或两个线圈同绕在一个铁芯上时如果其中一个线 圈中电流变化在另一个线圈中产生得感应电
当两个线圈放得很近或两个线圈同绕在一个铁芯上时如果其中一个线圈中电流变化在另一个线圈中产生的感应电动
自感电动势
互感电动势
交变电动势
在法拉第时代下列验证由磁产生电设想的实验中能观察到感应电流的是
将绕在磁铁上的线圈与电流表组成一闭合回路，然后观察电流表的变化
在一通电线圈旁放置一连有电流表的闭合线圈，然后观察电流表的变化
将一房间内的线圈两端与相邻房间的电流表相连，往线圈中插入条形磁铁后，再到相邻房间去观察电流表的变化
绕在同一铁环上的两个线圈，分别接电源和电流表，在给线圈通电或断电的瞬间，观察电流表的变化
如图所示.绕在铁芯上的线圈与电源滑动变阻器和开关组成闭合回路.在铁芯的右端套有一个表面绝缘的铜环
不计铁芯和铜环A.之问的摩擦.则下列情况中铜环A.会向右运动的是A.线圈中通以恒定的电流
通电时.使滑动变阻器的滑片尸向有匀速移动
通电时.使滑动变阻器的滑片P.向左加速移动
将开关突然断开的瞬间
如图所示绕在铁芯上的线圈与电源滑动变阻器和电键组成闭合回路在铁芯的右端套有一个表面绝缘的铜环
，下列各种情况中铜环A.中
没有
感应电流的是( ▲ ) A.线圈中通以恒定的电流
通电时，使变阻器的滑片P.作匀速移动
将电键突然断开的瞬间
通电时，使变阻器的滑片P.作加速移动
当两个线圈放得很近或两个线圈同绕在一个铁芯上时如果其中一个线圈中电流变 化在另一个线圈中产生得感应电
自感电动势
互感电动势
交变电动势
如图所示两个线圈绕在同一铁芯上A中接有电源B中导线接有一电阻R.在把磁铁迅速插入A线圈的过程中A线圈
当两个线圈放得很近或两个线圈同绕在一个铁芯上时如果其中-个线 圈中电流变化在另一一个线圈中产生的感应
当两个线圈放得很近或两个线圈同绕在一个铁芯上时如果其中一个线圈中电流变化 在另一个线圈中产生的感应电
如图所示绕在铁芯上的线圈与电源滑动变阻器和电键组成闭合回路在铁芯的右端套有一个表面绝缘的铜环a下列各
将电键突然断开的瞬间
线圈中通以恒定的电流
通电时，使滑动变阻器的滑片P.做加速移动
通电时，使滑动变阻器的滑片P.做匀速移动
闭合线圈在匀强磁场中绕垂直于磁场的轴转动时线圈中产生正弦式交变电流.若在如图10－1－21甲所示N.
2015年·北京市东城区一模如图所示匝数n＝60的线圈绕在变压器的闭合铁芯上通过AB两端在线圈内通
如图1所示一个理想变压器的原副线圈分别为ab和cd如图1甲所示.ab中通有如图1乙所示的正弦式交变电
在t=
时刻，铁芯中磁通量为零
在t=
时刻，副线圈cd两端间电压最大
在t=
时刻，副线圈c端电势高于d端
在t=
时刻，副线圈cd两端间电压最大
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下面短文中有10处语言错误请在有错误的地方增加删除或修改某个单词 注意 1.每句不超过两个错误 2.每处错误及修改均仅限一词 3.只允许修改10处多者从第11处起不计分 Helloboysandgirls!TodayIamgoingtotalkwithwhatyoushoulddowhenafirealarmgooff.Ifyouhearthealarmstandinlineatthedoorandwaityourteachertoleadyououtside.Stayclosetoyourteacherandclassmate.Don’tpanicorgetoutoflineandtryingtoremainquietandcalmly.Soonthefirefighterswillcomeandputoutafire.Ifit’safalsealarmandthereisnofireyourteacherwillleadusbacktotheclassroom.Ifyounoticethatwhensomeoneismissingandhurttellyourteacherimmediately.
D Witharound100studentsscheduledtobeinthat9amMondaymorninglectureitisnosurprisethatalmost20peopleactuallymakeittotheclassandonly10ofthemarestillawakeafterthefirst15minutes;itisnotevenasurprisethatmostofthemarestillintheirpyjamas睡衣.Obviouslystudentsareterribleatadjustingtheirsleepcyclestotheirdailyschedule. Allhumanbeingspossessabodyclock.Alongwithotheralerting警报systemsthisgovernsthesleep/wakecycleandisthereforeoneofthemainprocesseswhichgovernsleepbehaviour.Typicallythepreferredsleep/wakecycleisdelayedinadolescentswhichleadstomanystudentsnotfeelingsleepyuntilmuchlaterintheevenings.Thistypicalsleeppatternisusuallyreferredtoasthenightowlscheduleofsleep. Thisisopposedtotheearlybirdscheduleandisakindofdisorderwheretheindividualtendstostayupmuchpastmidnight.Suchapersonhasgreatdifficultyinwakingupinthemornings.Researchsuggeststhatnightowlsfeelmostalertandfunctionbestintheeveningsandatnight.Researchfindingshaveshownthatabout20percentofpeoplecanbeclassifiedasnightowlsandonly10percentcanbeclassifiedasearlybirds—theother70percentareinthemiddle.Althoughthisisclearlynottrueforallstudentsfortheoneswhoaretruenightowlsthisgivesthemanexcellentexcuseformissingtheirlectureswhichunfortunatelyfallbeforemidday. Whichofthefollowingisclosestinmeaningtotheunderlinedwordclassified
下面短文中有10处语言错误请在有错误的地方增加删除或修改某个单词 注意 1.每句不超过两个错误 2.每处错误及修改均仅限一词 3.只允许修改10处多者从第11处起不计分 Helloboysandgirls!TodayIamgoingtotalkwithwhatyoushoulddowhenafirealarmgooff.Ifyouhearthealarmstandinlineatthedoorandwaityourteachertoleadyououtside.Stayclosetoyourteacherandclassmate.Don’tpanicorgetoutoflineandtryingtoremainquietandcalmly.Soonthefirefighterswillcomeandputoutafire.Ifit’safalsealarmandthereisnofireyourteacherwillleadusbacktotheclassroom.Ifyounoticethatwhensomeoneismissingandhurttellyourteacherimmediately.
图2为某个组团式城市布局图各城区分散布局完成3～4题 该城市规划建设物流园区和化工园区应分别安排在
下面短文中有10处语言错误请在有错误的地方增加删除或修改某个单词 注意 1.每句不超过两个错误 2.每处错误及修改均仅限一词 3.只允许修改10处多者从第11处起不计分 Helloboysandgirls!TodayIamgoingtotalkwithwhatyoushoulddowhenafirealarmgooff.Ifyouhearthealarmstandinlineatthedoorandwaityourteachertoleadyououtside.Stayclosetoyourteacherandclassmate.Don’tpanicorgetoutoflineandtryingtoremainquietandcalmly.Soonthefirefighterswillcomeandputoutafire.Ifit’safalsealarmandthereisnofireyourteacherwillleadusbacktotheclassroom.Ifyounoticethatwhensomeoneismissingandhurttellyourteacherimmediately.
下面短文中有10处语言错误请在有错误的地方增加删除或修改某个单词 注意 1.每句不超过两个错误 2.每处错误及修改均仅限一词 3.只允许修改10处多者从第11处起不计分 Helloboysandgirls!TodayIamgoingtotalkwithwhatyoushoulddowhenafirealarmgooff.Ifyouhearthealarmstandinlineatthedoorandwaityourteachertoleadyououtside.Stayclosetoyourteacherandclassmate.Don’tpanicorgetoutoflineandtryingtoremainquietandcalmly.Soonthefirefighterswillcomeandputoutafire.Ifit’safalsealarmandthereisnofireyourteacherwillleadusbacktotheclassroom.Ifyounoticethatwhensomeoneismissingandhurttellyourteacherimmediately.
阅读下面短文并用英语回答问题请注意题后的词数要求 Whenmyfatherwascelebratingamilestone里程碑birthdayIpulledtogetherasurprisegifttreathewouldneverforget. Ashewasapproaching60Ihadafunidea:WhatifIcouldgetthememoriespeoplehadofhimputeachoneintoanenvelope—60intotal—andhavehimopenthemonebyoneonhisbirthdaySoIwroteane-mailtofamilyandfriendsexplainingmyidea. Isentthee-mailandwaited.AndthentherepliesstartedcominginandIwasveryverysurprised.Thereweresomanymemoriesandtheywereallsolovely.Theycamefromthe’50s’60s’70sfromeverydecade十年betweennowandthedaymydadwasborn.Theycamefrommymothermysiblingsmygrandmamydad’sfriendsfromhighschoolhissistermydad’sfirstbossacolleagueathisfirstjobfrompeoplewhohadn’tseenmydadin40yearsfrompeopleImyselfhadn’teveninformed.Theytypedthemandhandwrotethem.Theymailedthemande-mailedthem. ThenightbeforeDad’sbirthdaymysisterandIstayeduplateputtingeverythingtogetherwithsomeenvelopes. Thenextmorningafterbreakfastandpresentsandcakewegavethepileofenvelopestohim.Justonemorethingforyouwesaid. Ittookhimalongtimetoopenthemandread.Eachonewasabrieftickettoanothertimealeap跳跃backwardoveryearsanddecades.Therewasalotoflaughterandafewtearstoo. Iwaskindofsadwhentheprojectwasoverbecauseitwasgreatfuntocollectthesememories.Itgavemeadifferentpictureofdad. Whendidtheauthorgiveherfatherasurprisegiftnomorethan4words
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下面短文中有10处语言错误请在有错误的地方增加删除或修改某个单词 注意 1.每句不超过两个错误 2.每处错误及修改均仅限一词 3.只允许修改10处多者从第11处起不计分 Helloboysandgirls!TodayIamgoingtotalkwithwhatyoushoulddowhenafirealarmgooff.Ifyouhearthealarmstandinlineatthedoorandwaityourteachertoleadyououtside.Stayclosetoyourteacherandclassmate.Don’tpanicorgetoutoflineandtryingtoremainquietandcalmly.Soonthefirefighterswillcomeandputoutafire.Ifit’safalsealarmandthereisnofireyourteacherwillleadusbacktotheclassroom.Ifyounoticethatwhensomeoneismissingandhurttellyourteacherimmediately.
阅读下面短文并用英语回答问题请注意题后的词数要求 Whenmyfatherwascelebratingamilestone里程碑birthdayIpulledtogetherasurprisegifttreathewouldneverforget. Ashewasapproaching60Ihadafunidea:WhatifIcouldgetthememoriespeoplehadofhimputeachoneintoanenvelope—60intotal—andhavehimopenthemonebyoneonhisbirthdaySoIwroteane-mailtofamilyandfriendsexplainingmyidea. Isentthee-mailandwaited.AndthentherepliesstartedcominginandIwasveryverysurprised.Thereweresomanymemoriesandtheywereallsolovely.Theycamefromthe’50s’60s’70sfromeverydecade十年betweennowandthedaymydadwasborn.Theycamefrommymothermysiblingsmygrandmamydad’sfriendsfromhighschoolhissistermydad’sfirstbossacolleagueathisfirstjobfrompeoplewhohadn’tseenmydadin40yearsfrompeopleImyselfhadn’teveninformed.Theytypedthemandhandwrotethem.Theymailedthemande-mailedthem. ThenightbeforeDad’sbirthdaymysisterandIstayeduplateputtingeverythingtogetherwithsomeenvelopes. Thenextmorningafterbreakfastandpresentsandcakewegavethepileofenvelopestohim.Justonemorethingforyouwesaid. Ittookhimalongtimetoopenthemandread.Eachonewasabrieftickettoanothertimealeap跳跃backwardoveryearsanddecades.Therewasalotoflaughterandafewtearstoo. Iwaskindofsadwhentheprojectwasoverbecauseitwasgreatfuntocollectthesememories.Itgavemeadifferentpictureofdad. Whatwasthesurprisegiftnomorethan6words
E Womenarefriendly.ButmenaremorecompetitiveWhyResearchershavefoundit’salldowntothehormoneoxytocin荷尔蒙催生素.Althoughknownasthelovehormoneitaffectsthesexesdifferently. Womentendtobesocialintheirbehavior.TheyoftensharewithothersButmentendtobecompetitiveTheyaretryingtoimprovetheirsocialstatussaidProfessorRyan. Generallypeoplebelievethatthehormoneexytocinisletoutinourbodyinvarioussocialsituationsandourbodycreatesalargeamountofitduringpositivesocialinteraction互动suchasfallinginloveorgivingbirth. ButinapreviousexperimentProfessorRyanfoundthatthehormoneisalsoletoutinourbodyduringnegativesocialinteractionssuchasenvy. Furtherresearchesshowedthatinmenthehormoneoxytocinimprovestheabilitytorecognizecompetitiverelationshipsbutinwomenitraisestheabilitytorecognizefriendship. ProfessorRyan’srecentexperimentused62menandwomenaged20to37. Halfoftheparticipants参与者receivedoxytocin.Theotherhalfreceivedplacebo安慰剂. Afteraweekthetwogroupsswitchedwithparticipants.Theywentthroughthesameprocedurewiththeothermaterial. Followingeachtreatmenttheywereshownsomevideopictureswithdifferentsocialinteractions.Thentheywereaskedtoanalyzetherelationshipsbyansweringsomequestions.Thequestionswereabouttellingfriendshipfromcompetition.Andtheiranswersshouldbebasedongesturesbodylanguageandfacialexpressions. Theresultsindicatedthataftertreatmentwithoxytocinmen’sabilitytocorrectlyrecognizecompetitiverelationshipsimprovedbutinwomenitwastheabilitytocorrectlyrecognizefriendshipthatgotbetter. ProfessorRyanthusconcluded:Ourexperimentprovesthatthehormoneoxytocincanraisepeople’sabilitiestobetterdistinguishdifferentsocialinteractions.Andthebehaviordifferencesbetweenmenandwomenarecausedbybiologicalfactor因素thataremainlyhormonal. WhydidProfessorRyanconducttherecentexperiment
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阅读下面短文并用英语回答问题请注意题后的词数要求 Whenmyfatherwascelebratingamilestone里程碑birthdayIpulledtogetherasurprisegifttreathewouldneverforget. Ashewasapproaching60Ihadafunidea:WhatifIcouldgetthememoriespeoplehadofhimputeachoneintoanenvelope—60intotal—andhavehimopenthemonebyoneonhisbirthdaySoIwroteane-mailtofamilyandfriendsexplainingmyidea. Isentthee-mailandwaited.AndthentherepliesstartedcominginandIwasveryverysurprised.Thereweresomanymemoriesandtheywereallsolovely.Theycamefromthe’50s’60s’70sfromeverydecade十年betweennowandthedaymydadwasborn.Theycamefrommymothermysiblingsmygrandmamydad’sfriendsfromhighschoolhissistermydad’sfirstbossacolleagueathisfirstjobfrompeoplewhohadn’tseenmydadin40yearsfrompeopleImyselfhadn’teveninformed.Theytypedthemandhandwrotethem.Theymailedthemande-mailedthem. ThenightbeforeDad’sbirthdaymysisterandIstayeduplateputtingeverythingtogetherwithsomeenvelopes. Thenextmorningafterbreakfastandpresentsandcakewegavethepileofenvelopestohim.Justonemorethingforyouwesaid. Ittookhimalongtimetoopenthemandread.Eachonewasabrieftickettoanothertimealeap跳跃backwardoveryearsanddecades.Therewasalotoflaughterandafewtearstoo. Iwaskindofsadwhentheprojectwasoverbecauseitwasgreatfuntocollectthesememories.Itgavemeadifferentpictureofdad. Whydidtheauthorandhersisterstayuplatethenightbeforetheirfather’sbirthdaynomorethan9words
改革开放后随着我国社会经济的发展人口迁移日趋频繁完成1～2题 下列对当前人口迁出主要流向的表述与实际最相符的是
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时刻，铁芯中磁通量为零
时刻，副线圈cd两端间电压最大时刻，副线圈c端电势高于d端时刻，副线圈cd两端间电压最大
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