西安电子科技大学考研真题综合测试(英语)2005
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1 2004—2005学年第1学期试卷
一、判断题:(10分,在括号内划“√”或“×”)
( )1.“如果太阳从西边出来,则2+2=4”,此命题值为假。
( )2.(1,3,3,3)可以成为无向简单图的度数序列。
( )3.有一个函数f:XY,若f具有反函数,则f一定是单射。
( )4.(PQ)(PQ)是永真式。
( )5.在某集合上二元运算中,若某元素存在左右逆元,则该元素逆元唯一。
( )6.命题公式的主析取范式为0,则其主合取范式为1。
( )7.有向图的关联矩阵中所有元素之和为该图度之和 。
( )8.初级回路一定是简单回路。
( )9.若关系R具有自反性,则一定不具有反自反性。
( )10.x(A(x) yH(x,y))在具体的解释中其值是确定的。
二、填空(共30分)
1. 设A={1,2},P(A)表示A的幂集,,则P(A) A =_____________________。
2. 在一阶逻辑中符号化命题:“所有的人都是要死的”(只能用存在量词):
_________________________________________________。
3. P(x) y R(x,y)的前束范式是:_________________________。
4. n阶有向完全图中所有顶点的度数之和为________
5.已知从A到A/R的函数g:AA/R为自然映射,A={1,2,3 }, R=EA,则g(1)=____________________________。
6. 设函数f(x)=2x + 1,g(x)= x2-2,则f o g =____________________。
7. Klein四元群的运算表如下,其有__________________个子群。
e a b c
e e a b c
a a e c b
专注少数民族骨干计划考研辅导西安电子科技大学少数民族骨干计划考研英语真题、笔记、参考书、大纲、录取分数线、报录比西安电子科技大学少数民族骨干计划考研英语真题Text3Intheidealizedversionofhowscienceisdone,factsabouttheworldarewaitingtobeobservedandcollectedbyobjectiveresearcherswhousethescientificmethodtocarryouttheirwork.Butintheeverydaypracticeofscience,discoveryfrequentlyfollowsanambiguousandcomplicatedroute.Weaimtobeobjective,butwecannotescapethecontextofouruniquelifeexperience.Priorknowledgeandinterestinfluencewhatweexperience,whatwethinkourexperiencesmean,andthesubsequentactionswetake.Opportunitiesformisinterpretation,error,andself-deceptionabound.Consequently,discoveryclaimsshouldbethoughtofasprotoscience.Similartonewlystakedminingclaims,theyarefullofpotential.Butittakescollectivescrutinyandacceptancetotransformadiscoveryclaimintoamaturediscovery.Thisisthecredibilityprocess,throughwhichtheindividualresearcher’sme,here,nowbecomesthecommunity’sanyone,anywhere,anytime.Objectiveknowledgeisthegoal,notthestartingpoint.Onceadiscoveryclaimbecomespublic,thediscovererreceivesintellectualcredit.But,unlikewithminingclaims,thecommunitytakescontrolofwhathappensnext.Withinthecomplexsocialstructureofthescientificcommunity,researchersmakediscoveries;editorsandreviewersactasgatekeepersbycontrollingthepublicationprocess;otherscientistsusethenewfindingtosuittheirownpurposes;andfinally,thepublic(includingotherscientists)receivesthenewdiscoveryandpossiblyaccompanyingtechnology.Asadiscoveryclaimworksitthroughthecommunity,theinteractionandconfrontationbetweensharedandcompetingbeliefsaboutthescienceandthetechnologyinvolvedtransformsanindividual’sdiscoveryclaimintothecommunity’scrediblediscovery.Twoparadoxesexistthroughoutthiscredibilityprocess.First,scientificworktendstofocusonsomeaspectofprevailingKnowledgethatisviewedas
2005.12 研究生英语学位课统考真题
Paper One Part II Vocabulary (10minutes, 10 points) Section A (0.5 point each)
21. The vast crowd bust into spontaneous cheering at the skillful play.
A earnest B volcanic C hearty D automatic
22. Not everyone in the intelligence community was convinced the document was genuine.
A standard B valid C neat D lucid
23. They found substantial evidence that exposures to nerve gas was responsible for the veterans’ symptoms.
A contact B betrayal C exhibition D publication
24 The majority of prospective adoptive parents use an adoption agency, while others consult adoption facilitators
in the United States. A confident B justified C sensible D potential
25. This patient must on no account be left unattended, even for one minute.
A not repeatedly B not in any circumstances C without any reason D with no explanation.
西安电子科技大学2005
一、填空(25分)
1.已知0ln1sinlim2tanxfxxx,则0limxfx。
2.设1sin,00,0xxfxxx,则当时,f在0x处连续,当时,f在0x处可导且0f。
3.设21,0,0xxxfxex,则312fxdx。
4.20ln,1xdxx。
5.设21,01,0xfxxx,则其以2为周期的傅里叶级数在x处收敛于。
二、(10分)设函数,,ufxyz具有连续偏导数,且,zzxy由方程xyzxeyeze确定,求du。
三、(16分)计算下列各题。
1.22max,xyDedxdy,其中,01,01Dxyxy。
2.Czydxxzdyxydz,其中C是曲线2212xyxyz从z轴正向往z轴负向看C的方向是顺时针的。
四、(12分)求22222yaxdydzzadxdyxyz,其中为下半球面222zaxy的上侧,0a为常数。
五、(12分)设10x,且1212nnnxxx,1,2,,nn,证明nx收敛并求极限。 六、(10分)求11nnnxn的收敛域,并判定其一致收敛性。
七、(13分)讨论曲线4lnyxk与44lnyxx的交点的个数,其中k为参数。
八、(13分)(1)证明yx在0,上一致连续。
(2)设二元函数,fxy在点0,0的某个邻域内连续,且有
20220,lim1xyfxyxyxy
试问0,0是否为,fxy的极值点?请说明理由。