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1.
陈伟凤 《中学英语园地(高三版)》2004,(1)
Ⅰ.根据你所听到的句子及问题,从A,B,C,D中选择正确答案。(5分)1.A.Onthetable.B.Inthecupboard.C.Ontheplate.D.Inthekitchen.2.A.Yes,theyare.B.No,theydont.C.Yes,theydo.D.No,theyarent.3.A.Itisbetweenthetheatreandthebookshop.B.Itisnearthelibrary.C.Itisneartheseanotfarfromhere.D.Itisbetweenthetheatreandtheflowershop.4.A.Anhour.B.Aquarterofanhour.C.Twentyminutes.D.Thirtyminutes.5.A.Cuttingapieceofbeef.B.Washingacoat.C.WatchingTV.D.Cleaningthefloor.Ⅱ.根据你所听到的问句,从A,B,C,D中选择正… 相似文献
2.
习非 《中学英语园地(高三版)》2005,(1)
Ⅰ.单项选择从A,B,C,D中选出正确答案填入空白处。1.ThisisoldpictureofReadfamily.A.an,theB.an,×C.the,×D.the,a2.Thereisabigtreethehouse.A.inB.withC.onD.behind3.—canyouseeontheblackboard?—Apicture.A.WhereB.WhatC.HowD.Who4.Icantfindmybooks.Doyouthem?A.seeB.knowC.lookD.meet5.Lookthecoats.Theylooksame.A.at,theB.like,theC.at,aD.like,a6.Therearetwowindowsthiswallandonepictureit.A.on,onB.in,inC.on,inD.in,on7.Yourmotherisntathome.Pleaseyoursister.A.lookB.lookatC.looklikeD.lookafter8.W… 相似文献
3.
黄宜尧 《中学英语园地(高三版)》2004,(9)
.从A,B,C,D中选出你所听到的句子中含有的那个单词。(5分).A.IslandB.SideC.InsideD.Beside.A.riceB.priceC.railwayD.bikes.A.intentionB.liberationC.informationD.dictation.A.doctorB.teacherC.workerD.inventor.A.bikeB.wineC.kindD.mindⅡ.根据你所听到的问题,从A,B,C,D中选择正确答语。(5分)6.A.Certainly.Comethisway,please.B.Sure.Hereyouare.C.Ithinkso.D.Yes,itis.7.A.Yes,theyare.B.Nextweek.C.Idon蒺tthinkso.D.No,Ihaven蒺t.8.A.Becausehewantedtodosomethingtokeephimselfbusy.B.Becausehewasateache… 相似文献
4.
黄宜尧 《中学英语园地(高三版)》2004,(11)
听力部分(20分)Ⅰ.从A,B,C,D中选出你所听到的那个单词。(5分)1.A.gratefulB.painfulC.beautifulD.thankful2.A.footballB.baseballC.volleyballD.basketball3.A.brushB.finishC.crashD.rush4.A.interestB.instructionC.importantD.inspector5.A.leatherB.letterC.neverD.whetherⅡ.根据你所听到的问句,从A,B,C,D中选择正确答语。(5分)6.A.Yes,Ido.B.No,Idont.C.ItsOKnow.D.No,Ihavent.7.A.Dontworry.B.Wearenotbusy.C.Great.Letsgoandwatchit.D.Itdoesntmatter.8.A.Therobber.B.Theparrot.C.Thedog.D.Themonkey.9.… 相似文献
5.
黄宜尧 《中学英语园地(高三版)》2004,(10)
Ⅰ.根据你所听到的问句,从A,B,C,D中选出正确答语。(5分)1.A.Lastyear.B.OnJuly1st,1921.C.OnAugust1st,1927.D.OnOctober1st,1949.2.A.Yes,Ido.B.No,Idon蒺t.C.Yes,wehave.D.It蒺sinBeijing.3.A.WeknowitwasmadeinShanghai.B.Becausesatellitescanhelpuslearnmoreabouttheearth,theweatherandotherthings,andhelpussendandreceivemessages.C.Sorry,wehaven蒺t.D.Yes,wehave.4.A.About31,198,000.B.Thereare31,198,010,000.C.It蒺snearAmerica.D.Thankgoodness.5.A.Hereyouare.B.It蒺sabout800yuan.C.It蒺smadeinJapan… 相似文献
6.
水青 《中学英语园地(高三版)》2005,(2)
Ⅰ.根据下列对话情景,从A,B,C,D中选出正确答案。1.—Hi,Tom!Willyoucometomyhousethisevening?—.A.Yes,IdlovetoB.IdontlikeitC.HowoldareyouD.No,Iwill2.—WillyoupleasecometomybirthdaypartythisSaturday?—.A.Yes,IdoB.No,IdontC.Yes,IdlovetoD.No,Illgo3.—WouldyouliketocometodinnerthisSunday,MrSmith?—.A.Oh,no.Letsnot.B.Illstayathome.C.Idloveto,butIhaveotherthingstodo.D.Oh,no.Thatllbetoomuchtrouble.4.—WouldyouliketocomeovertodinnerthisFridayevening?—A.Whattimetogo?B.Idlovetogooneday.C… 相似文献
7.
呼振璞 《中学英语园地(高三版)》2004,(4)
一、听力部分(20分)Ⅰ.从A,B,C,D中选出你所听到的句子中含有的那个单词。(共5小题,计5分1.A.sayB.someC.sameD.safe2.A.hereB.heardC.hearD.hers3.A.moreB.norC.boyD.floor4.A.quiteB.thickC.quickD.quiet5.A.standB.stayC.storeD.storyⅡ.根据你所听到的句子,从A,B,C,D中选出正确答语。(共5小题,计5分)6.A.Hereyouare.B.Thanksalot.C.Seeyoutomorrow.D.Thatsallright.7.A.Imsorrytohearthat.B.Holdon,please.C.Verywell,thankyou.D.Fine,thanks.Andyou?8.A.Itdoesntmatter.B.Yourewelcome.C.Thatsnice.D.Nicetomeet… 相似文献
8.
任民 《中学英语园地(高三版)》2004,(11)
听力部分(20分)Ⅰ.听辨词语(5分)从A,B,C,D中选出你所听到的那个词语。1.A.tapeB.haveC.mapD.some2.A.meanB.moonC.meetingD.meat3.A.OctoberB.DecemberC.SeptemberD.November4.A.porridgeB.villageC.orangeD.passage5.A.bythewayB.inthewayC.onthewayD.onlyawayⅡ.句意理解(5分)根据你所听到的句子,从A,B,C,D中选择正确答语。1.A.Yes,Iagreewithyou.B.No,Idontknow.C.Yes,itsverywarm.D.Whataboutyou?2.A.Thankyou.B.Happybirthdaytoyou.C.Dontsayso.D.Thesametoyou.3.A.Itwasbrown.B.Itwassnowy.C.Iwentbybike.D.… 相似文献
9.
任民 《中学英语园地(高三版)》2004,(9)
听力部分(20分)Ⅰ.从A,B,C,D中选出你所听到的那个单词或短语。(5分)1.A.villageB.porridgeC.orangeD.college2.A.winterB.waitC.wheatD.feed3.A.tractorB.doctorC.watcherD.factory4.A.sitdownB.putdownC.upanddownD.liedown5.A.twelvefloorsB.thetwelfthfloorC.twelvedoorsD.thetwelfthdoorⅡ.根据你所听到的句子,从A,B,C,D中选出一个正确的答语。(5分)1.A.Thetiger.B.Thelion.C.Thepanda.D.Themonkey.2.A.Walkalongthestreet.B.No,thereisn蒺t.C.It蒺stenminutes蒺walk.D.Yes,itis.3.A.Byplane.B.Onthefarm.C.I蒺mad… 相似文献
10.
洪斐 《中学英语园地(高三版)》2005,(2)
Mymotherisagoodpolicewoman.Sheworkshardallday.Aftershegetshome,shedoessomecooking,washingandsoon.Everydaysheisverytired,butshenevercomplainsaboutit.Shelovesmeverymuch.Todayismymothersbirthday.Inthemorningshewenttoworkasusual.Iwantedtogiveherapresent.ButIamonlyastudent.Idonthavemuchmoney.Ididntknowwhattodo.SuddenlyIhadeanidea.Iwouldmakeheranicecard.Iwroteonthecard,“Mother,Happybirth-daytoyou.Iloveyou.”Ialsodrawsomepicturesonit.Afterclass,Iwenthomequickly.Oh,Motherwasathomealready.“Go… 相似文献
11.
一种新型高功率密度的正弦波永磁电机 总被引：1，自引：0，他引：1
A novel high power-density PMSM (permanent magnetic synchronous motor) with independent magnetic flux path for each phase is proposed in the paper.The complex mathematic model of PMSM is simplified by decoupling of magnetic flux paths between motor phases.In addition,harmonic compoments are lowered through optimum design of EMF (electric motive force) wave.Thus the ripple torque caused by EMF wave distortion is suppressed. 相似文献
12.
表面磁钢永磁无刷电机电磁转矩的解析法分析 总被引：1，自引：0，他引：1
With the air gap magnetic field distribution of surface mounted permanent magnet （PM） motors obtained using an analytical technique, the instantaneous electromagnetic torque and its corresponding components are investigated with the Maxwell stress tensor method. Accurate results can easily be achieved using the proposed method without using the tedious finite element analysis （FEA）. In this paper, the electromagnetic torque of a surface mounted PM motor with two phases energized is decomposed into four torque components. This technique is useful not only for the design and optimization of the permanent magnet motor, but also for the choice of control strategy. 相似文献
13.
With the air gap magnetic field distribution of surface mounted permanent magnet (PM) motors obtained using an analytical technique, the instantaneous electromagnetic torque and its corresponding components are investigated with the Maxwell stress tensor method. Accurate results can easily be achieved using the proposed method without using the tedious finite element analysis (FEA). In this paper, the electromagnetic torque of a surface mounted PM motor with two phases energized is decomposed into four torque components. This technique is useful not only for the design and optimization of the permanent magnet motor, but also for the choice of control strategy. 相似文献
14.
Magnetic Field Analysis of Interior Composite-Rotor Controllable-Flux Permanent Magnet Synchronous Machine 总被引：1，自引：0，他引：1
* A conventional permanent magnet synchronousmachine (PMSM) is built to prevent demagnetizationeven under the extreme operatingconditions in the de-signing phase of rotor magnetic circuit and dimensionof permanent magnets (PMs). The magnet thicknessis large enough to keep the counter magnetic motiveforce (MMF) of armature less than coercive force inhigh temperatures[1]. If a conventional PMSMoperates in a wide speedrange, vector control strategy is always adopted. Bycontrollingd-axis dema… 相似文献
15.
为克服现有混合磁轴承具有的缺陷,提出一种结构新颖的交流混合磁轴承作为高速电主轴的支承部件,永磁体产生偏磁磁通,电磁铁线圈产生控制磁通;介绍了该磁轴承的结构和工作原理,并基于Matlab/Simulink建立了考虑陀螺耦合的电主轴刚性转子和柔性转子四自由度的模型。 相似文献
16.
磁悬浮（无轴承）电机利用磁场力使转子悬浮并驱动其实现高速或超高速旋转．基于传统电机技术提出一种交流圆弧电机原理,并按电磁轴承悬浮技术,水平方向对称于转子布置2个圆弧电机,垂直方向对称于转子布置2个圆弧电机,构成交流磁悬浮感应电机;建立电机在干扰作用下转子与定子间的间隙（气隙长度）变化规律,基于电磁理论建立了气隙磁感应强度的分布规律,利用虚位移原理建立电机电磁悬浮力和电磁转矩数学模型;通过有限元分析对磁感应强度、电磁悬浮力和电磁转矩等分布特性进行了仿真研究． 相似文献
17.
18.
This paper presents an investigation of inverter fault-tolerant operation for a permanent magnet synchronous motor （PMSM） direct torque control （DTC） system under various inverter faults. The performance of a faulty standard 6-switch inverter driven PMSM DTC system is analyzed. To avoid the loss or even disaster caused by the inverter faults, a topology-modified inverter with fault-tolerant capability is introduced, which is reconfigured as a 3-phase 4-switch inverter. The modeling of the 4-switch inverter is then analyzed and a novel DTC strategy with a unique nonlinear perpendicular flux observer and feedback compensation scheme is proposed for obtaining a continuous, disturbance-flee drive system. The simulation and experimental results demonstrate that the proposed inverter fault-tolerant PMSM DTC system is able to operate stably and continuously with acceptable static and pretty good dynamic performance. 相似文献
19.
工频稀土永磁发电机的气隙磁场是由稀土永磁体提供,具有功率密度大、体积小、结构简单等特点.介绍了单相小功率（4kVA）工频稀土永磁发电机组的设计,通过采样REPMG端电压信号反馈自动调节油机转速,以及采用非均匀气隙长度分布设计永磁发电机的极靴形状,实测样机的性能表明其具有电压波形畸变率和电压变化率小的特点. 相似文献
20.
An approach of position sensorless control for permanent magnet synchronous motor （ PMSM ） is put forward based on a sliding mode observer. The mathematical model of PMSM in a stationary αβ reference frame is adopted, and the system is controlled by the digital signal processor （ DSP; TMS320LF2407 according to the control achieve closed loop operation of the motor, the stator theory of sliding mode observer. In order to magnetic field should be vertical with the rotor magnetic field and be synchronous with rotor rotating, so the position and speed of PMSM is estimated in real time and the estimated position is modified continuously. The simulation results indicate that the proposed observer has high precision is more robust to the parametric variation and load in estimation of PMSM position and speed, and torque disturbance. 相似文献