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练习1I、将下列句子译成汉语，注意句中有些冠词的特殊位置：1.Inthiscasethecurrent（电流）existsforonlyhalfthecycle（周期）.2.Insuchacasethereisnocurrentflowinginthecircuit（电路）.3.Sensitivity（灵敏度）isameasureofhowsmallasignal（信号）areceiver（接收机）canpickupandamplify（放大）toalevelusefulforcommunications.4.εmaybeassmallapositiveconstantasyouplease.5.Evensofundamentaladimension（量纲）astimewasmeasuredextremelycrudelywithsandandwaterclockshundredsofyearsago.6.Nonlineardistortion（非线性失真）canbecausedbytoolargeaninputsignal.7.Themethodusedisquiteaneffectiveone.8.Aseries（级数）solutionofthiskindofproblemallowsascloseacalculationoftheerrorasneeded.II、将下列句子译成汉语，注意句中“and”和“or”的确切含义：1.Airhasweightandoccupiesspace.2.Inthiswaylesscollectordissipation（集电极功耗）results,andtheefficiencyincreases.3.Wecangoonestepfartherandtakeintoaccountthenonzeroslopeoftheactualcurves.4.Tryhard,andyouwillworkthenut（螺母）loose.5.Thefirststepinanalyzingaphysicalsituationistoselectthoseaspectsofitwhichareessentialanddisregardtheothers.6.ThissatellitewasusedforcommunicationsbetweentheUnitedStatesandGreatBritain,FranceandItaly.7.Somephysicalquantitiesrequireonlyamagnitudeandaunittobecompletelyspecified.Thusitissufficienttosaythatthemassofamanis85kg,thattheareaofafarmis160acres,thatthefrequencyofasoundwaveis660cycles/sec,andthatalightbulbconsumeselectricenergyattherateof100watts.8.Geothermalenergy,orenergyfromwithintheearth,canbeusedtogenerateelectricity.9.Thecurrentinacapacitor（电容器）leads（导前）thevoltageby90o,or,thevoltagelagsthecurrentby90o.10.Themessageisalogicalunitofuserdata,controldata,orboth.III、将下列句子译成汉语，注意句中分数和倍数的正确译法：1.ByvaryingVBEonlyafewhundredthsofavolt,thebasecurrent（基极电流）canbechangedsignificantly.2.Thestandardmeterisaccuratetoabouttwopartsinonebillion.3.Cromatographic（层析的）techniqueshavebeendevelopedtodetectairpollutantsatconcentrations（浓度）ofonepartpermillionorless.4.Thevolumecoefficient（体膨胀系数）ofasolidisalmostexactlythreetimesitslinearcoefficient.5.Thedemandforthiskindofequipmentinthenearfuturewillbe20timeswhatitis.6.Thewavelengthofthismusicalnote（音符）is7.8ft,overthreetimeslongerthanthewavelengthofthesamenoteinair(2.5ft).7.Thiscausesthecollectorcurrent（集电极电流）tochangebyafactorofapproximatelyβ.8.Thisfactor（因子）isnowequalto9,areductionbyafactorof11.IV、将下列句子译成英语：1、火箭是由金属制成的。2、电池是能提供（give）恒定电压（constantvoltage）的一种器件（device）。3、这是一台多好的计算机啊！4、在计算机中，趋势（tendency）是以尽可能高的时钟速率（clockrate）运作（operate）。5、必须使物体运动，要不然就没有做功（work）。6、这条铁路比那条长五倍。7、普通的窗户经受（withstand）不了如此（so）大的力。8、这个值（value）是原来的1/3。9、这是一个太复杂的问题以至于我们在此不加讨论（gointo）。10、解这个题要花费计算机半个小时（的时间）。V、改正下列句中的错误，并将句子译成汉语：1.A80-lbforcemustbeusedhere.2.Thisisatoolargeasignal.3.Digitaltransmission（数字式传输）doesnotneedtohaveasahighS/Nratio（信噪比）asanalog（模拟）transmission.4.Tounderstandphysics,goodknowledgeofmathematicsisnecessary.5.Thisisasosensitiveinstrumentthatitcanmeasureslightchangeinpressure._______________________________________________________________________________练习2I、将下列句子译成汉语，并说明句中划有横线的介词短语的语法功能：1.Oneofthemostvaluablewaysofrepresentingfunctionsisbygraphicalrepresentation（图示法）.2.Anumberofconditionsareclassifiedas“occupationaldiseases（职业病）.”3.Engineersmayfindthebookofgreatvalue.4.Ifyouletyourpencildroptothefloor,youcanseegravityinaction.5.Inthiscasethefailurepoint（失效点）correspondstoafactorofsafetyof1.6.Thetopicoftrouble-shooting（故障检修）willbediscussedinChapter9.7.Typicalnoisemargins（噪声裕度）areusuallybetterthantheguaranteedvaluebyabout75mV.8.Upontheapplicationofanexternalforce,wecancausethebodytomove.9.Wemeasureresistance（电阻）inohms.10.Directcurrent（直流电）flowsonlyinonedirection.11.Wecanusethisdevicetomeasureaslightchangeinpressure.12.Thehistoryoftwo-wayradfiocommunicationsinsomewaysparallelsthedevelopmentofcommercialradiobroadcasting.II、将下列句子译成汉语，并说明划有横线的动词的类别：1.Whenanelectriccurrentflowsthroughawire,thewirewillgethot.2.Thatstatement（陈述）soundsnatural.3.Thewaterinthemiddlepipewillstandlowerandthusindicatesalowerpressure.4.Ittakesabody（物体）preciselyaslongtofallfromaheighthasitdoestorisethathigh.5.Wecannotexaggeratethedangerofattemptingashortcircuitdirectlyacrossavoltagesource.III、将下列句子译成汉语，并注意划有横线的副词或副词短语的语法功能：1.Atthistimethepulse（脉冲）isover.2.Thetwoequationsbelowareofgreatimportance.3.Ingeneral,wecansay,foranybodyanywhere,weight=mass×acceleration（加速度）duetogravity（重力）.4.ThetemperaturesonJupiter（木星）andtheplanetsbeyondareextremelylow.5.Theproblemnowistodeterminetheresultant（合力）oftheseforces.6.Withgreattelescopesastronomerscanseestarsandotherthingsveryfaraway.7.Theforcebetweentwocharges（电荷）of1coul（库仑）eachadistanceof1mapartis9×109N（牛顿）.8.Itallbeginwiththedevelopment30yearsagoofthetransistor（晶体管）.IV、将下列句子译成英语：1、我们非常容易地获得了这个结果。（要求对划线部分用介词短语来表示）2、常用的仪器有许多。（要求对划线部分用介词短语来表示）3、人们用牛顿（newton）为单位来度量各种力。（要求对划线部分用介词短语来表示）4、重力（gravity）这一概念将在下一节介绍。5、在这新的三章中，第一章介绍核能（nuclearenergy）。6、这两个值相差5。7、这种新设备与那些旧设备相比有许多优点。8、我们需要解这些方程把那些未知数（unknown）求出来。9、在日常生活中，力似乎是仅仅靠“直接接触”来传递（transmit）的。10、这个结果看起来是正确的。11、这一点无论怎样强调也不过分。12、它们相隔的距离是很小的。V、改正以下句中的错误，并将句子译成汉语：1.Currentismeasuredwithamperes.2.Inthiscasethewheelwillrotatefor360o.3.Comparedwiththatalgorithm,thealgorithmpresentedinthispaper（论文）hastwoadvantages.4.These