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1、飞行器专业英语复习重点提要:（仅供参考）考试题型：1.词汇互译，15分；2.句中词汇翻译，25分；3.英文段落翻译，40~45分；4.句子汉译英，15~20分。内容要点：上册：UNIT1Lesson1:词汇：工程材料，分类，金属，聚合物（高分子），陶瓷，复合材料，有色金属，黑色金属，韧度，环氧树脂……段落：关于工程材料分类，如：第一页第三段，fourgroups……，第二页的ferrousmetals……Lesson2:词汇：拉力，压力，刚性，应力，应变，拉伸强度，屈服强度，抗扭强度，疲劳强度，硬度……段落：如：第10页第一段，thepropertieso
2、fa……，stressandstrain,stressisdefined……,Strain,ofunit……，11页第4，5两小段，thestress-straindiagram……UNIT2Casting,forging,welding,gaswelding,laserwelding,explosionwelding……Lesson8:词汇：淬火，回火，退火，铁素体，马氏体，珠光体……53页第一段，Heattreatment……，hardeningisaprocessof……UNIT3bearing,gear,UNIT4Hydraulic,valveLe
3、sson14:词汇：机床，车床，卧式车床，铣床，磨床，刨床，主轴箱，刀架，尾座，丝杠，转塔车床，仿形铣床……下册：Lesson4ApplicationofElectronicInstrumentIntroduction下面的第二段，电子仪器测量系统各部分组成介绍的段落，包括Transducer,powersupply,signalconditioner……Open-loop,close-loopLesson12ComputerAidedManufacturing段落：AnimportantfeatureofCAD/CAMinmachiningoperati
4、onsisitsabilitytodescribetoolpathsinoperationssuchasNCturning,milling,anddrilling.Theprogrammerprovidesinstructions(programs)totheCAD/CAMsystem,whichautomaticallydeterminesandoptimizesthetoolpath.Theengineeroftechniciancandisplayandvisuallycheckthetoolpathforpossibletoolcollisions
5、withclamps,fixtures,orotherinterferences.Thetoolpathcanbemodifiedatanytimetoaccommodateotherpartshapestobemachined.CAD/CAMsystemsarealsocapableofcodingandclassifyingpartsintogroupsthathavesimilarshapes,usingalphanumericcoding.Numericalcontrol(NC)isamethodofcontrollingthemovementso
6、fmachinecomponentsbydirectlyinsertingcodedinstructionsintheformofnumericaldata(numbersandletters)intothesystem.Thesystemautomaticallyinterpretsthesedataandconvertsthemtooutputsignals.Thesesignals,inturn,controlvariousmachinecomponents,suchasturningspindlesonandoff,changingtools,mo
7、vingtheworkpieceorthetoolsalongspecificpaths,andturningcuttingfluidsonandoff.AnNCmachinecanbecontrolledthroughtwotypesofcircuits:open-loopandclosed-loop.Intheopen-loopsystem,thesignalsaregiventotheservomotorbytheprocessor,butthemovementsandfinaldestinationsoftheworktablearenotchec
8、kedforaccuracy.Theclosed-loopsyst
