写作答案科英课件 DEMO.docx
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写作答案科英课件 DEMO.docx
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写作答案科英课件DEMO
写作练习参考答案
练习1(onpage8)
II.
6.Thevoltageacrossthiscapacitorisafewhundredthsofavolt.
7.Theoutputofthefactorytenyearsagowasonlyonefifthwhatitisnow[或:
…onlyonefifthitspresentoutput].
8.Thedifferencebetweenthesetwovaluesis13partsin104.
III.
1.Thenewlydesignedinstrumentisgoodinquality[或:
…isofgoodquality].
2.Thisengineneedstobecleaned[或:
cleaning].
3.Thisrunningmachinewillstopofitselfinaminuteortwo[或:
…inoneortwominutes].
4.Inthiscase,theinputdoesnotfall;theoutputdoesnotfall,either.[或:
…;neither[nor]doestheoutput.]
5.Theresistanceofaconductordependsnotonlyonthematerialofwhichtheconductorismade,butalsoonthesizeandtemperatureoftheconductor.
6.Anothercomsatwaslaunchedonthemorningofthe8thofOctober.
………………………………………………………………………………………………………..
练习2(onpage23)
II.
2.Ofthefirstfourchapters,Chapter3isthemostimportant.
4.Inthiscase,currentleadsvoltageby90o.
7.Nowitisnecessaryforustosolvethisequationforthatunknown.
8.Uponsubstitutionofthesevalues,itisfoundthatvisequaltothevelocityoflight.
12.Intheirstudyofelectricity,physicistsdefinedelectricfieldintensity.
14.Thiscoefficientremainstobedetermined.
15.Hereweusetwometallicballstwometersapart.
III.
1.Thatprofessorismuch[或:
verymuch]interestedinthistopic.
2.Thesemultimetersaremuchalikeinsizeandweight.
3.Thisvoltagecanhardlybemeasured.
4.Inthislaboratory,thisinstrumentisbetterthananyotherone[或:
…thananyoneelse].
5.Torepairthemachine,theservicemanhastoremovethecover.[或:
Beforethemachinecanberepaired,thecoverhastoberemoved.]
6.Theprefacetothisbookiswellwritten.
……………………………………………………………………………………………………
练习3(onpage31)
II.
10.Herewemustusewiresonethousandththediameterofasilkthread.
14.ACcanbechangedintoDC,aprocesscalledrectification.
16.Aninstrumentformeasuringcurrent,voltageandresistance,themultimeteriswidelyused/hasfoundwideapplicationintheworkhavingconnectionwithelectricity.
19.Thiscurveshowsthefallin[或:
of]conductivitywithincreasing[或:
increased]temperature.
III.
1.Thefeaturesofthisdevicearesmallsizeandlightweight.
2.Othertypesofelectricmotorarealsowidelyusedinindustry.
3.Nostudents[或:
Noneofthestudents]cansolvethisspecialkindofequation.
4.Notuntiltheinventionofthemicroscopedidtherealstudyofbacteriabecomepossible.
5.Theydonotknowifthismaterialcouldstandsolargeaforce[或:
…whetherthismaterialcouldstandsolargeaforceornot].
6.Themachinewillautomaticallystarttooperateagainintwohours.
…………………………………………………………………………………………………
练习4(onpage39)
II.
6.Noneofthesewindowscanwithstandsolargeaforce.
8.Notextbooksavailable[OR:
Noneofthetextbooksavailable]havementionedthispoint.
18.Thedarkerthecolor,themorelightis/willbeabsorbed.
19.Thegreatertheresistanceofawire,themoreenergywillbedissipatedinit.
III.
1.Thisexperimentbeginsateighto’clock/inMay/tomorrow.
2.Thevoltageacrosstheresistorismeasuredinvolts.
3.Boththeengineersarebusy(in)designinganewtypeofcomputer.[OR:
…busywiththedesignof….]
4.Copperisakindofmatterandsoisair.
5.Wefindthisconceptverydifficulttoexplain.
6.TheywillleaveforBeijingtoattendaninternationalconferenceoncommunications.
………………………………………………………………………………………………….
练习5(onpage43)
II.
1.Itisquitepossibleforustosolvethisequation.
2.Ittakesonlyafewmonthstodesignanewtypeofairplanewiththehelpofacomputer.
3.Itremainsnowforustocalculatetheresistanceinthiscircuit.
4.Itisleftasaproblemtothereadertoshowthatthisformulaholds.
6.Thisvalleyisusedasthefoundationonwhichtobuildthedam.
7.Therearemanytypesofmultimeterstochoosefrom.
9.Letitberequiredtofindoutthisangle.
10.Lettobeequaltozero.
12.Thefartherthetarget(is),thelonger(time)ittakesfortheechotoreturn.
14.Forthisseriestoconverge,xmustbelessthan1.
15.Theabilityofacapacitortostoreachargeisaffected/influencedbyafewfactors.
17.ForQ2toconduct,itsbasemustbeabout1.8volts.
III.
1.SubstitutingEq.(7)in/intoEq.(8),weobtain/have/geta=b.[或:
SubstitutionofEq.(7)into/inEq.(8)gives/yields/resultsina=b.]
2.Soundtravelslessfastthanlightdoes.
3.Everyone/Eachofthemethodshasitsadvantagesanddisadvantages.
4.Workequals/isequaltoforcemultipliedbydistance[或:
Workequalsforcetimesdistance.或:
Workistheproductofforceanddistance.]
5.Usuallywecannotseetheearth’sshadow,becausethereisnothingforittofallon.
6.Thisequipmenthasquiteafewadvantagesallitsown.
IV.
1.Thisnewmethodhastheadvantagesofhighefficiencyandeasyadjustment.
2.Thesinelawofthevariationofthelightintensitywiththecylinderdiameterhasbeenemphasized.
3.Ourmethodisdifferentfromthosedescribed/presentedinthepapersavailableon/discussingthesameproblem.
……………………………………………………………………………………………………….
练习6(onpage49)
II.
9.Byfindinganytwopointsinthisstraightline,wecandrawtheline/it.
12.Theseintegratedcircuitsweredesignedwithoneortwousesinmind.
13.LetusconstructacircleofradiusR,withtheoriginasthecenter.
14.Theequationtothecirclewiththecenterattheoriginandofradiusaisx2+y2=a2.
III.
1.Byobservingtheeffectofanewdrugonthepatients,one/wecanseeitstherapeuticeffect.
2.Ironisalmostasgoodaconductorasaluminium.
3.Itiseasyforustodeterminetheweightofthebody.
4.Frictionmakestheworkputintoamachinegreaterthantheusefulworkaccomplishedbyit.
5.Onbeingheated,theairinthebottlewillexpand.
6.Manyoftheprinciplesofareceiveralsoapplytoatransmitter.
IV.
1.Onlythroughthestudyof[OR:
Onlybystudying]theperformanceofthesystem,canone/weappreciate/understanditsadvantages.
2.Iftheself-biascircuitisofpoordesign[OR:
isnotdesignedwell/properly],choppingoscillationswilltakeplaceintheLCoscillator.
3.ThispaperpresentsaCADmethodforincreasingtheprintingspeedandimprovingtheprintingquality.
……………………………………………………………………………………………………
练习7(onpage54)
II.
1.Heatraysareemittedbyall(material)bodiesnomatterhowlowtheirtemperaturesare.
2.Smallastheyare,atomsaremadeupofstillsmallerunits.
3.Themeasurementofanglesisuniqueinthattheunitisdimensionless.
4.Thebodyisinsuchastatethatitcandowork.
5.Thesedouble-angleformulascanbeusedanytimewehaveexpressedoneangleastwiceanother.
6.Theproblemwasnottobesolveduntilaradicallynewanddifferentconceptwasintroduced.
7.Somethingfurthermustbedonetothesesignalsbeforetheyarefedtothesubsequentstage.
8.Everysubstance,beit[或:
whetheritbe]asolid,aliquid,oragas,consistsofatoms.
9.Therearevariousindications[或:
Allindicationsare]thatthepriceofcomputerswillcontinuetofall.
10.Thereisnoevidencethatenergycanbecreatedordestroyed.
11.Inthiscasethereisnoassurancethatthecircuitistunedtothatfrequency.
12.Theseexperimentsleadtotheresultthatwith/foraconstantforce,theaccelerationisinverselyproportionaltothemass.
13.TheideathateverythingismadeupofverysmallparticleswasknowntotheGreeksovertwothousandyearsago.
14.Sincethen,therehavebeenspeculationswhetherlifeexistsonotherplanets.
15.Thisisduetothefactthatthereexistscapacitanceinthecircuit.
16.Besidesthefactthatthepropertiesofthematerialshouldbeincludedintheanalyticalmodel,wemusttakeotherfactorsintoaccount.
17.Thetermfollowercomesfromthefactthattheoutputvoltagefollowsthesignalvoltagequiteclosely.
18.Usingthefactthatthecurvepassesthrough(2,1),wecanevaluatetheconstant.
19.TheusefulnessoftheKarnaughmapliesinthefactthatadjacentcellscanbegroupedvisuallytoeliminateredundantvariables.
20.Thisseriesofexperimentsleadstotheresultthatwithaconstantforce,theaccelerationisinverselyproportionaltothemass.
III.
1.Airexertspressureineverydirection.
2.Thehotterthebody(is),themoreenergyitradiates.
3.ThisisthelargestaircraftthathaseverbeenmanufacturedinChina.
4.SemiconductorswillbediscussedinChapter2.
5.Theabilityofsomeelementstogiveoffradiationsisreferredtoasradioactivity.
6.Todoallthis,asoundknowledgeofcomputerscienceisnecessary.
IV.
1.Themathematicaldescriptionofandthefull-compensationconditionsforthe3-axissteady-trackingprinciplearealsogiven.
2.AcomparisonofSTMandATMismade,whichshowsthatATMwillbethebasisofBISDN.[或:
AcomparisonbetweenSTMandATMshowsthatATMwillbethebasisofBISDN.]
3.Adetailedanalysisoftheabilityofthecomponentstocarryloadsismade.
…………………………………………………………………………………………………..
练习8(onpage58)
II.
6.Itcanhappen/suchacasemayhappenthattheoverallphaseshiftbecomeszero.
7.Atfirstglanceitdoesnotappearthatthisintegralfitsanyoftheformspresentedinthischapter.
10.Itisnecessarytodetermineunderwhatconditionsthisequationistrue.
11.Itoftenhappens/Itiscommon/Itisoftenthecasethatwemayobtaindifferentformsofsolution.
16.Currentchangeswithwhatiscalledresistance.
18.Thereadercanunderstandwhatthefunctionofthisdeviceis[或:
…whatthisdevicecando/perform.]
III.
1.Bypowerismeantthespeed,orrate,ofdoing
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