科技英语写作练习答案.docx

科技英语写作练习答案.docx

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科技英语写作练习答案

科技英语写作练习答案

练习一

一、

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

二、

1.Thisisanhparameter.

2.Weturnnowtoadiscussionoflocalareanetworks.

3.TheBainbridgemassspectrometerisasimportantaninstrumentastheopticalspectrometer.

4.Itisnecessarytofindouthowlongatimeisrequiredforanelectrontotravelthe[this]lengthofthewire.

5.Thedensityofasubstanceisitsmassperunitvolume.

6.Theradiusoftheearthis6.37×106m.

7.The[These]twoparametersarethesame.

8.Anincreaseinpressurealwayscausesadecreaseinvolume.

9.Fig.（2-5showswhatisexpressedbyEq.（2-2.

10.Theunitofinductanceisthehenry.

11.Toolargeaninputsignalcancausenonlineardistortion.

12.Usingthedefinitionofslope,wecanderivetheequationwhichrepresentsastraightline.

13.Theexpressionf（x+h-f（xisfrequentlyusedinthestudyofcalculus.

14.Anequationwhichcanbewritteninthefollowingformisknownasalinearequationinoneunknown.

15.Inacomputer,thetendencyistooperateatashighaclockrateaspossible.

16.Tindoesnothaveashighameltingpointaslead（does.

17.Thisaveragevelocityishalfthefinalvelocity.

18.Electricitycanbeeasilychangedintootherformsofenergy.

19.In1831,JosephHenryintheUnitedStatesdiscoveredthephenomenonofelectromagneticinduction.

20.Acomputerconsistsofseveralparts[units].

三、

Chemistryisbaseduponconceptsthatrequirethemeasurementofsuchquantitiesaslength,volume,mass,andtemperature.Thesemeasurementsarequantitative;thatis,theyhavenumbersassociatedwiththem.Inthissection,wewillconsidersomeofthesimpleinstrumentsusedinquantitativemeasurements.Wewillalsolookattheunitsusedtoexpressthesemeasuredquantities.

四、

1.TheUASMAprotocolemploysauniqueframestructure.

2.PerformanceanalysisofanM-aryspreadspectrumreceiverusingbiorthogonalcycliccodes

3.Finally,abroadsteppedimpedancetransformerisdesignedbythismethod.

4.Dynamicanalysisandevaluationofthesecurityofaproactivesecretsharingsystem

5.Withthestate-transitiondiagram,thesecurityprobabilityofthesystemisobtained.

6.Theapproachcanbeappliedtotheone-dimensionalpotentialbarrier

withanarbitraryprofile.

7.WeproposeanumericalmethodbasedonNewton’siterativemethod.

练习二

一、

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.

二、

1.Thecurrentinthecircuitisonehalftheshort-circuitcurrentofthesource.

2.Theinternalresistanceofthiskindofstoragebatteryisonlyafewthousandthsofanohm.

3.Itserrorissixpartsin1012.

4.Thiscomputerstoresfourtimesmoreinformationthanthatone（does.

5.Themassofthemoonis1/80thatoftheearth.

6.Thedemandforthiskindofequipmentinthenearfuturewillbe20timeswhatitis.

7.Thevoltageacrossthiscomponentisafewtenthsofavolt.

8.Nowitsinternalpressureisonethirdwhatitwas.

三、

Theconceptoftemperatureisfamiliartoallofus.Thisisbecauseourbodiesaresosensitivetotemperaturedifferences.Whenwepickupapieceofice,wefeelcoldbecauseitstemperatureislowerthanthatofourhand.Afterdrinkingacupofcoffee,wemayrefertoitas―hot,‖―lukewarm,‖or―atrocious.‖Inthefirsttwocases,atleast,wearedescribingtheextenttowhichitstemperatureexceedsours.

四、

1.Thevoltageacrossthiscapacitorisafewhundredthsofavolt.

2.Thisobjectisfivetimesheavierthanthatoneis.

3.Unlessotherwisestated,itisassumedthatsilicontransistorsareusedandthatICBOcanbeneglected.

4.Thiscircuithastheadvantagesofsimplestructureandeasyadjustment.

5.Figs.1,2,and3showthisprocess.

6.Forfurtherinformation,consultreferences[3,5,9].

7.Theinteriorpointisaminimumratherthanamaximum,giventhatthereturnfunctionsareconvex,andthattheHessiandeterminantispositive.练习三

一、

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.二、

1.Forx>1,thereisnosolutiontothisequation[thisequationhasnosolution].

2.Upon[On]substituting[substitutionof]thesevaluesinto[to]theequation,itwasfoundthatvisequaltothevelocityoflight.

3.Intheirstudyofelectricity,physicistsdefinedtheparameter.

4.ThiscircuitissimilarinoperationtothatofFig.1-10.

5.Inourdiscussionofthissubject,weshallrestrictourattentiontoitsbasicprinciples.

6.Wedescribetheinteractionsamongchargeswiththehelpoftheconceptofelectricfield.

7.Thisisdueinparttotheearth’srotation.

8.Upon[On]applicationofproperexternalforce,thebodywillstarttomove.

9.Thiscomputerisverysmallinsize.

10.Thesewavestravelonlyinonedirection.

三、

ThecommondrycellusedinflashlightsisconstructedasshowninFig.2-28.Thepositiveelectrodeisacarbonrodandthenegativeoneisazinccan.Thecelliscalled―dry‖becauseitselectrolyteisamoistpaste.Ifitwereactuallydry,ionsintheelectrolytecouldnotmoveaboutandnocurrentcouldbeproduced.Intheoperationofthecell,zincatomsbecomezincionsbylosingelectrons.

四、

1.Thispaperpresentsanewmethodfortherecognitionofradartargets.

2.TheinfluenceofthemovingstateofthetargetonthetrackingaccuracyoftheEKFisgreat.

3.Thisnewmethodhasmanyadvantagesoverthoseavailable.

4.Thisnewlydesignedinstrumentisgoodinquality[isofgoodquality].

5.Anothercomsatwaslaunchedonthemorningofthe8thofOctober.

6.Voltageismeasuredinvolts.

7.Thisexperimentstartedat8o’clocklastnight.

8.TheywillleaveforBeijingtoattendaninternationalconferenceonmobilecommunication.

练习四

一、

1.Theanswer（keytothisproblemlooks（appearscorrect.

2.Thiscoefficientremainstobedetermined.

3.Thetwoequationsbelowwillbeoften（frequentlyusedinlaterchapters.

4.Hereweusetwometalballs10cmapart.

5.Thispapercontains（hasnothingnew.[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-circuitplaysthesamerolethatresistancedoesin

adc-circuit.

15.Twoparallelwiresadistance（ofδapartcarrythecurrenti.

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.Thereisnorootlargerthan1[unity].

27.Thiscoefficientistypically0.35.

28.Thechargeismovingparalleltotheelectricfield.

二、

Thedensityofasubstanceistheratioofitsmasstoitsvo