科技英语写作高级教程(第二版)参考答案.doc
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V、练习参考答案
练习1
I、
1、the(各项均为负。
)
2、the;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(这是均方根值伏特计。
)
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(电阻的单位是欧姆。
)
7、an(这是一个h参数。
)
8、/;/(图5-1画出了Oersted的实验。
)
9、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。
)
10、/(水压机将在第14章加以考虑。
)
11、the;the[/](我们容易确定参数μ的值。
)
12、/;the(根据式(2-1),我们得到以下的关系式。
)
13、the;/(作者工作在位于阿林顿的得克萨斯大学。
)
14、an(甚至当积分区间并不是无穷时,能够恰当地显示一个时函数的傅氏变换的仪器是多么重要啊!
)
II、
1.Dr.EmmetgraduatedfromHarvardUniversityin2001.
2.ProfessorLiearnedhisPh.D.degreeinmechanicalengineeringfromtheXi’anUniversityofTechnologyin1988.
3.Nowweshallturntothediscussionoflocalareanetworks.
4.TheBainbridgemassspectrometerisasimportantaninstrumentastheopticalspectrometer.
5.Howlongatime[或Howmuchtime]isrequiredtothisexperiment?
Thedensityofasubstanceisitsmassperunitvolume.
6.Anincreaseinpressurealwayscausesadecreaseinvolume.
7.Fig.(2-5)showswhatisexpressedbyEq.(2-2).
8.Theunitofinductanceisthehenry.
III、
1.TheUASMAprotocolemploysauniqueframestructure.
2.Finally,abroadsteppedimpedancetransformerisdesignedbythismethod.
3.Dynamicanalysisandevaluationofthesecurityofaproactivesecretsharingsystem
4.Theapproachcanbeappliedtotheone-dimensionalpotentialbarrierwithanarbitraryprofile.
5.WeproposeanumericalmethodbasedonNewton’siterativemethod.
练习2
I、
1.Thiscircuitconsistsofabattery,aninductorandacapacitor.
2.Computetheelectricfieldsatpointsa,b,andc.
3.ThissatelliteisusedforcommunicationsbetweentheUnitedStatesandGreatBritain,FranceandItaly.
4.Weassumethattheantennaisverticalandthatitslossiszero.
5.Chapters6,7,and8dealwithtransmissionlines.
II、
1.Itserrorissixpartsin1012.
2.Thiscomputerstoresfourtimesmoreinformationthanthatone(does).
3.Thedemandforthiskindofequipmentinthenearfuturewillbe20timeswhatitis.
4.Thevoltageacrossthiscomponentisafewtenthsofavolt.
5.Nowitsinternalpressureisonethirdwhatitwas.
III、
1.Thisobjectisoverfivetimesheavierthanthatoneis.
2.Unlessotherwisestated,itisassumedthatsilicontransistorsareusedandthatICBOcanbeneglected.
3.Thiscircuithastheadvantagesofsimplestructureandeasyadjustment.
4.Figs.1,2,and3showthisprocessindetail.
5.Forfurtherinformation,consultreferences[3,5,9].
练习3
I、
1.Thisnewtypeofcomputerhasmanyadvantagesoverthegeneraltype.
2.Itisnotdifficulttosolvethisdifferentialequationfortheunknownquantity.
3.Ofthesefivenewchapters,thefirstonedealswiththebasicprinciplesofnegativefeedback.
4.Atthispoint/time,currentdiffersinphasefromvoltageby90o.
5.Byanalyzing[Bytheanalysisof]theparametersoftheinstrument,wecanunderstanditsperformance.
6.Wewillfindoutitsaveragevelocityoverthisdistance.
7.Thescienceofelectronicsistooimportantintheworldtoday.
8.Theysolvedthisproblemwithgreatdifficulty.
II、
1.Forx>1,thereisnosolutiontothisequation[thisequationhasnosolution].
2.Upon[On]substituting[substitutionof]thesevaluesinto[in]the
equation,weobtainedthefollowingexpression..
3.ThiscircuitissimilarinoperationtothatofFig.1-10.
4.Thiscomputerisverygoodinperformance.
5.Thesewavestravelonlyinonedirection.
III、
1.Thispaperpresentsanewmethodfortherecognitionofradartargets.
2.TheinfluenceofthemovingstateofthetargetonthetrackingaccuracyoftheEKFisgreat.
3.Anothercomsatwaslaunchedonthemorningofthe8thofOctober.
4.Voltageismeasuredinvolts.
5.TheywillleaveforBeijingtoattendaninternationalconferenceonmobilecommunication.
6.Unlessotherwisestated,itisassumedthatsilicontransistorsareusedandthatICBOcanbeneglected.
7.
练习4
I、
1.Theforceactsperpendiculartothesurfaceofthetable.
2.Thethreecoefficientshereremainstobedetermined.
3.Thetwoequationsbelowwillbeoften(frequently)usedinlaterchapters/inthechapterswhichfollow.
4.Hereweusetwometalballs10cmapart.
5.Theoutputremains/staysconstant/unchanged/fixed/unaltered/thesame.
6.Allthetextbooksavailablediscussthisproblem.
7.Accurateinoperationandhighinspeed,computershavefoundwideapplications.
8.Theanswertothisproblemlookscorrect.
9.Twoparallelwiresadistance(of)δapartcarrythecurrenti.
10.Theproblemnowishowtomeasurethevoltageacrossthiscomponent.
11.Thesedatawillbesenttothecomputingcenter2kilometersaway.
12.Uponrearrangingtheequationabove,wehave[get,ob