科技英语练习练习答案.docx
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科技英语练习练习答案.docx
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科技英语练习练习答案
练习1
II、
1、an(人们对这课题的兴趣越来越浓。
)
2、a(功率额定值是电阻器不会引起温度太大的上升而能安全地耗散的最大功率。
)
3、an(其主要的缺点是增加了噪声。
)
4、The;a(该设备的成功设计需要详细地了解性能指标。
)
5、the;a;a(在氢原子的布尔模型中,一个电子绕一个质子以半径为R的圆周运转。
)
6、the(频率的单位是赫兹。
)
7、a;a;an;the(如果在电路的两端加上电压的话,就会有电流在电路中流动。
)
8、/;/(图5-1画出了Oersted的实验。
)
9、an(这里我们应该使用一个18伏的电池。
)
10、A;a;a(机器是能够传递力来完成某一确定目的的一种设备。
)
11、The;/(水压机将在第14章加以考虑。
)
12、The;the;the(研究处于运动中的流体,是力学中较为困难的分支之一,因为可能出现的现象是多种多样的。
)
13、the;the[/](我们容易确定参数μ的值。
)
14、/;the(根据式(2-1),我们得到以下的关系式。
)
15、an(在这里必须使用一根S形管子。
)
16、the;/(作者工作在位于阿林顿的得克萨斯大学。
)
17、an(这是一只R位的变换器。
)
18、An(这里必须使用一个“异”或门电路。
XOR=ExclusiveOR)
III、
1.Thisisanhparameter.
2.Weturnnowtoadiscussionoflocalareanetworks.
3.TheBainbridgemassspectrometerisasimportantaninstrumentastheopticalspectrometer.
4.Itisnecessarytofindouthowlongatimeisrequiredforanelectrontotravelthe[this]lengthofthewire.
5.Thedensityofasubstanceisitsmassperunitvolume.
6.Theradiusoftheearthis6.37×106m.
7.The[These]twoparametersarethesame.
8.Anincreaseinpressurealwayscausesadecreaseinvolume.
9.Fig.(2-5)showswhatisexpressedbyEq.(2-2).
10.Theunitofinductanceisthehenry.
11.Toolargeaninputsignalcancausenonlineardistortion.
12.Usingthedefinitionofslope,wecanderivetheequationwhichrepresentsastraightline.
13.Theexpressionf(x+h)-f(x)isfrequentlyusedinthestudyofcalculus.
14.Anequationwhichcanbewritteninthefollowingformisknownasalinearequationinoneunknown.
15.Inacomputer,thetendencyistooperateatashighaclockrateaspossible.
16.Tindoesnothaveashighameltingpointaslead(does).
17.Thisaveragevelocityishalfthefinalvelocity.
18.Electricitycanbeeasilychangedintootherformsofenergy.
19.In1831,JosephHenryintheUnitedStatesdiscoveredthephenomenonofelectromagneticinduction.
20.Acomputerconsistsofseveralparts[units].
化学是基于像长度,体积,质量和温度这样一些需要测量的概念之上的。
这些测量是定量的,也就是说,它们与数字相关。
在这一节里,我们将认识一些用于定量测量的简单仪器,还会讲到这些测量中所用的单位。
IV、
Chemistryisbaseduponconceptsthatrequirethemeasurementofsuchquantitiesaslength,volume,mass,andtemperature.Thesemeasurementsarequantitative;thatis,theyhavenumbersassociatedwiththem.Inthissection,wewillconsidersomeofthesimpleinstrumentsusedinquantitativemeasurements.Wewillalsolookattheunitsusedtoexpressthesemeasuredquantities.
V、
1.TheUASMAprotocolemploysauniqueframestructure.
2.PerformanceanalysisofanM-aryspreadspectrumreceiverusingbiorthogonalcycliccodes
3.Finally,abroadsteppedimpedancetransformerisdesignedbythismethod.
4.Dynamicanalysisandevaluationofthesecurityofaproactivesecretsharingsystem
5.Withthestate-transitiondiagram,thesecurityprobabilityofthesystemisobtained.
6.Theapproachcanbeappliedtotheone-dimensionalpotentialbarrierwithanarbitraryprofile.
7.WeproposeanumericalmethodbasedonNewton’siterativemethod.
练习2
II、
1.Ordinarytransformersarenotideal,andthereforepowerlossesoccurinthem.
2.Thismaterialattractsironobjectsandcanevenmagnetizethem.
3.Thiscircuitconsistsofabattery,aninductorandacapacitor.
4.Computetheelectricfieldsatpointsa,b,andc.
5.ThissatelliteisusedforcommunicationsbetweentheUnitedStatesandGreatBritain,FranceandItaly.
6.Matterisanythinglikeair,waterorwood.
7.Assumethatlossesinthecoilarezero,thatC=500μF,andthattherippleis20percent.
8.Itisfoundmoreconvenienttoadoptthepointofviewthatamovingchargesetsupamagneticfield,andthatthisfieldexertsaforceonanotherchargemovingthroughit.
9.Chapters6,7,and8dealwithwhatiscalledtheelectronicbrain.
10.Studentsmaylearnthatmathematicsisthelanguageforscientificideas,thatscienceisasourceofmathematicalideas,andthatmathematicscanfurnishbrilliantanswerstoimportantscientificproblems.
III、
1.Thecurrentinthecircuitisonehalftheshort-circuitcurrentofthesource.
2.Theinternalresistanceofthiskindofstoragebatteryisonlyafewthousandthsofanohm.
3.Itserrorissixpartsin1012.
4.Thiscomputerstoresfourtimesmoreinformationthanthatone(does).
5.Themassofthemoonis1/80thatoftheearth.
6.Thedemandforthiskindofequipmentinthenearfuturewillbe20timeswhatitis.
7.Thevoltageacrossthiscomponentisafewtenthsofavolt.
8.Nowitsinternalpressureisonethirdwhatitwas.
IV、
Theconceptoftemperatureisfamiliartoallofus.Thisisbecauseourbodiesaresosensitivetotemperaturedifferences.Whenwepickupapieceofice,wefeelcoldbecauseitstemperatureislowerthanthatofourhand.Afterdrinkingacupofcoffee,wemayrefertoitas“hot,”“lukewarm,”or“atrocious.”Inthefirsttwocases,atleast,wearedescribingtheextenttowhichitstemperatureexceedsours.
V、
1.Thevoltageacrossthiscapacitorisafewhundredthsofavolt.
2.Thisobjectisfivetimesheavierthanthatoneis.
3.Unlessotherwisestated,itisassumedthatsilicontransistorsareusedandthatICBOcanbeneglected.
4.Thiscircuithastheadvantagesofsimplestructureandeasyadjustment.
5.Figs.1,2,and3showthisprocess.
6.Forfurtherinformation,consultreferences[3,5,9].
7.Theinteriorpointisaminimumratherthanamaximum,giventhatthereturnfunctionsareconvex,andthattheHessiandeterminantispositive.
练习3
II、
1.Thistypeofcomputerhasmanyadvantagesoverthattype.
2.Wemustsolvethisequationfortheloopcurrent.
3.Ofthesefivenewchapters,thefirstonedealswiththebasicprinciplesofnegativefeedback.
4.Thissectionintroduces[presents]theconceptofforce.
5.Thisparametervaries[changes]withtemperature.
6.Thecurrentandvoltageinthiscircuitdifferinphaseby90o.[Thephasesofthecurrentandvoltageinthiscircuitdifferby90o.]
7.Soundwavestravelinalldirections.
8.Byanalyzing[Bytheanalysisof]theparametersoftheinstrument,wecanunderstanditsperformance.
9.Thisisasufficientandnecessaryconditionforsolving[thesolutionof]theequation.
10.Wewillfindoutitsaveragevelocityoverthisdistance.
11.Wemeasureforceinnewtons.
12.Thispaperintroducesanewmethodformeasuringthisparameter.
III、
1.Forx>1,thereisnosolutiontothisequation[thisequationhasnosolution].
2.Upon[On]substituting[substitutionof]thesevaluesinto[to]the
equation,itwasfoundthatvisequaltothevelocityoflight.
3.Intheirstudyofelectricity,physicistsdefinedtheparameter.
4.ThiscircuitissimilarinoperationtothatofFig.1-10.
5.Inourdiscussionofthissubject,weshallrestrictourattentiontoits
basicprinciples.
6.Wedescribetheinteractionsamongchargeswiththehelpoftheconceptofelectricfield.
7.Thisisdueinparttotheearth’srotation.
8.Upon[On]applicationofproperexternalforce,thebodywillstartto
move.
9.Thiscomputerisverysmallinsize.
10.Thesewavestravelonlyinonedirection.
IV、
ThecommondrycellusedinflashlightsisconstructedasshowninFig.2-28.Thepositiveelectrodeisacarbonrodandthenegativeoneisazinccan.Thecelliscalled“dry”becauseitselectrolyteisamoistpaste.Ifitwereactuallydry,ionsintheelectrolytecouldnotmoveaboutandnocurrentcouldbeproduced.Intheoperationofthecell,zincatomsbecomezincionsbylosingelectrons.
V、
1.Thispaperpresentsanewmethodfortherecognitionofradartargets.
2.TheinfluenceofthemovingstateofthetargetonthetrackingaccuracyoftheEKFisgreat.
3.Thisnewmethodhasmanyadvantagesoverthoseavailable.
4.Thisnewlydesignedinstrumentisgoodinquality[isofgoodquality].
5.Anothercomsatwaslaunchedonthemorningofthe8thofOctober.
6.Voltageismeasuredinvolts.
7.Thisexperimentstartedat8o’clocklastnight.
8.TheywillleaveforBeijingtoattendaninternationalconferenceonmobilecommunication.
练习4
II、
1.Theanswer(key)tothisproblemlooks(appears)correct.
2.Thiscoefficientremainstobedetermined.
3.Thetwoequationsbelowwillbeoften(frequently)usedinlaterchapters.
4.Hereweusetwometalballs10cmapart.
5.Thispapercontains(has)nothingnew.[Thereisnothingnewinthispaper.]
6.Theforceactsperpendiculartothesurfaceofthetable.
7.Thisrulecanbeusedfor[…canapplyto]allintegers,bothpositiveandnegative.
8.Aneutronhasamassslightlylargerthanthatofaproton.[…hasaslightlymassthanaproton.]
9.Electronsarethesmallestparticlespresentinordinarymatter.
10.Allthetextbooksavailablediscussthisproblem.
11.Accurateinoperationandhighinspeed,computershavefoundwideapplications.
12.Theinputgoesnegativeand[while]theoutputstaysconstant.
13.Theseraysseemtocomefromtheimage.
14.Impedanceinanac-circuitplaysthesamerolethatresistancedoesinadc-circuit.
15.Twoparallelwiresadistance(of)δapartcarrythecurrenti.
16.Theequationshereareofgreatimportance.
17.Weshalluseacable10meterslong.
18.Theproblemnowishowtomeasurethevoltageacrossthiscomponent.
19.Thesedatawillbesenttothecomputingcenter2kilometersaway.
20.Uponrearrangingtheequationabove,wehave[get,obtain]thefollowingexpression.
21.Thatstatementsoundsquitereasonable.
22.Electronscanpassrelativelyunimpededthroughmetals.
23.Thebodycollideswithotherbodiesnearby.
24.Thesechargescaninteractwithotherchargespresent.
25.Forcescanbetransmittedwithoutcontact,contrarytothecommonbelief.
26.Thereisn
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