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气动选择填空题题库2

气动选择填空题题库2

气动选择填空题题库
1.气缸用于实现直线往复运动
2.气马达用于实现连续回转运动
3.气缸输出力的大小,可通过调(减)压阀来调节
4.气动三联件安装在气动系统的入口
5.饱和水含量是指单位立方米空气在所述温度下能够吸收水分的最大含量
6.收集气动系统中的冷凝水,并将水分排出的管路称为排水管路
7.从空压机排气口到后冷却器或储气罐之间的管路称为排出管路
8.连接气动执行元件和各种控制阀间的管路称为控制管路
9.从过滤器吸入口到空压机吸入口之间的管路,此段管路管径宜大,称为吸气管路
10.从储气罐到气动设备间的管路称为气管路
11.不含有水蒸气的空气称为干空气
12.后冷却器的作用是将空压机出口的温度冷却到40℃左右
13.吸收式干燥器的工作过程是一个纯化学过程
14.冷冻式干燥机的工作原理是将湿空气冷却到其露点温度以下,再将压缩空气加热至环境温度输送出去
15.气动逻辑元件按结构形式分类不包括弹簧式。

专项练习二-选择填空

专项练习二-选择填空

专项练习二:选择填空一、选择填空(100分)1.________is the population of Germany?( )A.What B.WhichC.How much D.How many2.A few hours earlier, someone ________the police that thieves________ to steal the necklace. ( )A.had told; had tried B.would tell; would try C.would tell; had tried D.had told; would try 3.Football is ________an exciting sport that people all over the world love it. ( )A.so B.tooC.such D.very4.The coffee ________has no sugar in it sells well. ( )A.though B.whichC.but D.even5.David’s always the winner of the race but this time he ________others. ( )A.fell behind B.fell downC.fell over D.fell off6.At the police station, Ted ________by a smiling policeman that his bicycle ________. ( )A.told; had found B.was told; had found C.had been told; was found D.was told; had been found7.Do you want to have ________?( )A.else anything B.else somethingC.more something D.anything else8.—________?—No, I haven’t looked at the menu yet.—Very well. I’ll be back in a few minutes. () A.Have you decided B.What would you like it C.Did you think well D.Can you see that9.—Will somebody go and fetch Dr White?—He’s already been ________. ()A.asked for B.sent forC.called for D.looked for10.—________?—A twelve.—Oh, you’re lucky. Here it is. Why don’t you try it on?()A.How old are you B.How long is your dress C.What size do you wear D.What time is it now 11.Maybe we can find something ________him ________the Internet. ( ) A.of; on B.on; inC.about; on D.with; in12.The Smiths ________lived here for ________. ( )A.has; sometimes B.have; some timeC.has; sometime D.have; sometime13.Have you ever seen ________ man?( )A.a such tall B.so a tallC.a so tall D.such a tall14.He wanted to know ________. ( )A.what’s her name B.what her name isC.what was her name D.what her name was15.They were ________pleased to see each other ________forgot everything else. ( )A.too; to B.so; that theyC.very; that they D.too; that16.New computers work ________faster than the old ones. ( )A.millions of times B.millions of timeC.several million of times D.million of time17.The house needs to ________ right now. ( )A.clean B.be cleanedC.being cleaning D.cleaning18.________seemed that he ________in bed then. ( )A.He; lay B.He; was layingC.It; was lying D.It; was laying19.He is a famous animal doctor from England ________wrote many books about animals. ( )A.who B.whereC.that D.which20.Though she is rich, she spends ________on clothes. ( )A.much B.manyC.little D.few21.—I’m taking my driving test tomorrow.—________!( )A.Congratulations B.Come onC.Good luck D.Cheers22.Excuse me for breaking in, ________I have some good news for you. ( )A.so B.andC.but D.yet23.—Is John coming by train?—He should, but he ________not. He likes driving his car. ( ) A.must B.canC.need D.may24.—You haven’t said a word about my new coat, Brenda. Do you like it?—I’m sorry I ________anything about it sooner. I certainly think it’s pretty on you. ()A.wasn’t saying B.don’t sayC.won’t say D.didn’t say25.Jumping out of________ airplane at ten thousand feet is quite ________ exciting experience. ( )A./;the B./; anC.an; an D.the; the26.It is said in Australia there is more land than the government knows ________. ( )A.it what to do with B.what to do it with C.what to do with it D.to do what with it 27.—Shall I talk to him in English or French?—Do as you please. He can speak ________of them. ( ) A.one B.bothC.neither D.any28.The traffic today was ________, so I got home earlier than usually. ( )A.weak B.heavyC.light D.special29.Mary shouted “Catch!” and ________the keys out from the window. ( )A.turned B.gaveC.threw D.described30.Mum is getting better so ________is no need to send for a doctor. ( )A.she B.thatC.it D.there31.It’s foolish to have a taxi ________you can easily walk to the station. ( )A.if B.whenC.that D.since32.We have reached the point ________a change is needed. ( )A.which B.whenC.that D.where33.This book is written in ________ easy English ________beginners can understand. ( )A.such; that B.so; thatC.such; as D.too; that34.Your radio is too noisy. Would you please ________?( )A.to turn it down B.turn it downC.turn down it D.turn it up35.John had a good time yesterday, ________. ( )A.so had Tom B.so Tom wasC.so Tom did D.so did Tom36.He is ________ tired that he can’t walk any further. ()A.very B.tooC.so D.quite37.The doctor said to him, “Just a little cold. ________. ”( ) A.Anything serious B.Nothing seriousC.Serious anything D.Serious nothing38.Our classroom ________every day. ( )A.should clean B.should be cleanedC.should kept clean D.cleans39.The girl is good ________English but weak ________science subjects. ( )A.in; at B.at; onC.in; in D.at; in40.I don’t know ________or not. ()A.whether will he come B.if will he comeC.if he won’t come D.whether he will come41.A group of ________are eating ________and ________at the foot of the hill. ( )A.sheepes; grasses; leaves B.sheep; grass; leafC.sheeps; grass; leafs D.sheep; grass; leaves 42.—Dad, do you know when ________?—At seven this morning. ( )A.the football game will startB.the football game startC.is the football game going to startD.shall we start the football game43.It will be a long time ________Peter ________his work. ( )A.since; has finished B.after; finishesC.when; will finish D.before; finishes44.—By the way, Robert sends his best wishes to you.—________. ( )A.It’s great B.Thank you.C.All right D.That’s very nice of him 45.—Tom and Jack? I didn’t believe they could do the work.—________, but they really did it well. ( )A.So did I B.So I didn’tC.Neither did I D.Me, too46.Bob, ________the window quickly. ________strongly the wind blows!( )A.will close; Because B.is closing; HowC.close; For D.close; How47.“Go and buy a bottle of ink, Kate. ________. ”( )A.Here’s the money B.Give you the moneyC.Get you money D.Please take the money48.The sign “THIS SIDE UP” is often seen ________.A.on a box B.in the streetC.at a police station D.at a post office49.Few of us like him because he thinks ________ of others than of himself.A.much B.much moreC.much less D.a little50.Just after going to bed, ________. ( )A.Lucy heard the doorbell B.the doorbell rangC.someone was knocking at the door D.the door was knocked loudly参考答案一、1~5 ADCBA 6~10 DDABC11~15 CBDDB 16~20 ABCAC21~25 CCDDC 26~30 CBCCD31~35 BDABD 36~40 CBBDD41~45 DADDC 46~50 DAACA。

2022年人教版数学中考复习:选择、填空综合训练2及答案

2022年人教版数学中考复习:选择、填空综合训练2及答案

选择、填空综合训练(时间:40分钟分值:54分)一、选择题:本大题共10小题,每小题3分,共30分.每小题只有一个正确选项.1.412的倒数是( )A.412B.-29C.-412D.292.已知a-b=3,a-c=1,则(b-c)2-2(b-c)+94的值为( )A.274B.412C.272D.4143.点P(a,b)在第四象限,且|a|>|b|,那么点Q(a+b,a-b)在( )A.第一象限B.第二象限C.第三象限D.第四象限4.如图,直线l经过第二、三、四象限,l的解析式是y=(m-2)x+n,则m的取值范围在数轴上表示为( )第4题图5.如图所示,△ABC的各个顶点都在正方形的格点上,则sin A的值为( )第5题图A.55B.255C.225D.1056.若实数a使关于x的一元二次方程(a+1)x2-3x+1=0有两个不相等的实数根,则实数a的取值范围是( )A.a<54B.a<54且a≠-1 C.a>54D.a>54且a≠-17.如图,在△ABC中,∠CAB=70°,将△ABC绕点A逆时针旋转到△AB′C′的位置,使得CC′∥AB,则∠BAB′的度数是( )A.70°B.35°C.40°D.50°第7题图8.如图,△ABC是⊙O的内接三角形,连接OA,OB,OC.若∠AOB=40°,∠OBC=50°,AC=4,则⊙O的直径为( )第8题图A.433B.4 C.833D.89.如图,在矩形纸片ABCD中,AD=9,AB=7,点F是BC上一点,点E在AD上,将矩形纸片沿直线EF折叠,点A落在点A′处,点B恰好落在边CD上的点B′处,A′B′交AD于点G,若CB′=3,则四边形EFB′G的面积等于( )第9题图A.353B.553C.352D.145610.如图,已知二次函数y=ax2+bx+c(a≠0)的图象与x轴交于点A(-1,0),与y 轴的交点B 在(0,-2)和(0,-1)之间(不包括这两点),对称轴为直线x =1,下列结论:①abc >0;②4a +2b +c >0;③13<a <23;④b >c.其中含所有正确结论的选项是( )第10题图A .①②③B .①③④C .②③④D .①②④二、填空题:本大题共8小题,每小题3分,共24分.11.在平面直角坐标系内,把点P 先向左平移2个单位长度,再向上平移4个单位长度后得到的点的坐标是(-5,3),则点P 的坐标是 .12.一枚材质均匀的骰子,六个面的点数分别是1,2,3,4,5,6,投这个骰子,掷的点数不大于4的概率是 .13.若14的小数部分为a ,整数部分为b ,则a ·(14+b)的值为 .14.函数y =2-m x的图象与直线y =x 没有交点,那么m 的取值范围是 . 15.如图,在平行四边形ABCD 中,AB =8,BC =10,∠ABC =60°,BE 平分∠ABC 交AD 于点E ,AF 平分∠BAD 交BC 于点F ,交BE 于点G ,连接DG ,则DG 的长为 .第15题图16.如图,在△ABC 中,∠A =70°,BC =4,以BC 的中点D 为圆心,2为半径作弧,分别交边AB ,AC 于E ,F ,则EF ︵的长为 .第16题图17.如图,在△ABC中,AB=AC=12厘米,∠B=∠C,BC=9厘米,点D为AB的中点.如果点P在线段BC上以v厘米/秒的速度由B点向C点运动,同时,点Q 在线段CA上由C点向A点运动.若点Q的运动速度为3厘米/秒,则当△BPD与△CQP全等时,v的值为.第17题图18.观察等式:2+22=23-2;2+22+23=24-2;2+22+23+24=25-2;…,已知按一定规律排列的一组数:2100,2101,2102,…,2199,2200,若2100=S,用含S 的式子表示这组数据的和是.选择、填空综合训练(时间:40分钟分值:54分)一、选择题:本大题共10小题,每小题3分,共30分.每小题只有一个正确选项.1.412的倒数是( D )A.412B.-29C.-412D.292.已知a-b=3,a-c=1,则(b-c)2-2(b-c)+94的值为( D )A.274B.412C.272D.4143.点P(a,b)在第四象限,且|a|>|b|,那么点Q(a+b,a-b)在( A )A.第一象限B.第二象限C.第三象限D.第四象限4.如图,直线l经过第二、三、四象限,l的解析式是y=(m-2)x+n,则m的取值范围在数轴上表示为( C )第4题图5.如图所示,△ABC的各个顶点都在正方形的格点上,则sin A的值为( A )第5题图A.55B.255C.225D.1056.若实数a使关于x的一元二次方程(a+1)x2-3x+1=0有两个不相等的实数根,则实数a的取值范围是( B )A.a<54B.a<54且a≠-1 C.a>54D.a>54且a≠-17.如图,在△ABC中,∠CAB=70°,将△ABC绕点A逆时针旋转到△AB′C′的位置,使得CC′∥AB,则∠BAB′的度数是( C )A.70°B.35°C.40°D.50°第7题图8.如图,△ABC是⊙O的内接三角形,连接OA,OB,OC.若∠AOB=40°,∠OBC=50°,AC=4,则⊙O的直径为( C )第8题图A.433B.4 C.833D.89.如图,在矩形纸片ABCD中,AD=9,AB=7,点F是BC上一点,点E在AD上,将矩形纸片沿直线EF折叠,点A落在点A′处,点B恰好落在边CD上的点B′处,A′B′交AD于点G,若CB′=3,则四边形EFB′G的面积等于( D )第9题图A.353B.553C.352D.145610.如图,已知二次函数y=ax2+bx+c(a≠0)的图象与x轴交于点A(-1,0),与y轴的交点B在(0,-2)和(0,-1)之间(不包括这两点),对称轴为直线x=1,下列结论:①abc>0;②4a+2b+c>0;③13<a<23;④b>c.其中含所有正确结论的选项是( B )第10题图A.①②③B.①③④C.②③④D.①②④二、填空题:本大题共8小题,每小题3分,共24分.11.在平面直角坐标系内,把点P 先向左平移2个单位长度,再向上平移4个单位长度后得到的点的坐标是(-5,3),则点P 的坐标是 (-3,-1) .12.一枚材质均匀的骰子,六个面的点数分别是1,2,3,4,5,6,投这个骰子,掷的点数不大于4的概率是 23. 13.若14的小数部分为a ,整数部分为b ,则a ·(14+b)的值为 5 .14.函数y =2-m x的图象与直线y =x 没有交点,那么m 的取值范围是 m >2 . 15.如图,在平行四边形ABCD 中,AB =8,BC =10,∠ABC =60°,BE 平分∠ABC 交AD 于点E ,AF 平分∠BAD 交BC 于点F ,交BE 于点G ,连接DG ,则DG 的长为 219 .第15题图16.如图,在△ABC 中,∠A =70°,BC =4,以BC 的中点D 为圆心,2为半径作弧,分别交边AB ,AC 于E ,F ,则EF ︵的长为 49π .第16题图17.如图,在△ABC 中,AB =AC =12厘米,∠B =∠C ,BC =9厘米,点D 为AB 的中点.如果点P 在线段BC 上以v 厘米/秒的速度由B 点向C 点运动,同时,点Q 在线段CA 上由C 点向A 点运动.若点Q 的运动速度为3厘米/秒,则当△BPD 与△CQP 全等时,v 的值为 2.25或3 .第17题图18.观察等式:2+22=23-2;2+22+23=24-2;2+22+23+24=25-2;…,已知按一定规律排列的一组数:2100,2101,2102,…,2199,2200,若2100=S,用含S 的式子表示这组数据的和是 2S2-S .。

2019高考英语:二轮单项选择、填空专练(2)(解析或解析)

2019高考英语:二轮单项选择、填空专练(2)(解析或解析)

2019高考英语:二轮单项选择、填空专练(2)(解析或解析)第***节21.---Ihavejusthadmywatchrepaired.---Howmuchdidthey forthat?A.costB.chargeC.spendD.take22.---It’sbeenawonderfulHalloweenParty.Thankyouverymuch.--- .A.MypleasureB.I’mgladtohearthat.C.No,thanksD.It’sOK23.---Howaboutthebookyouarereading?---Goodindeed.It manyproblemswehavecomeacrossinourstudy.A.saysB.talksC.coversD.refers24.Theroomisinaterriblemess;it_______cleaned.A.can’thavebeenB.couldn’tbeC.mayhavebeenD.wouldbe25.He thetest,buthewasn'tcarefulenough.A.wasabletopassB.musthavepassedC.couldhavepassedD.mightbeabletopass26.Ihavekeptthatpicture_____Icanseeiteverydayasitalwaysremindsmeofmyuniversityd aysinLondon.A.inwhichB.whereC.whetherD.wh en27.Heexpectedthere______moreroomforhimtoputinadesk.A.willbeB.isC.tobeD.being28.Thesportsmeet,originallyduetobeheldlastFriday,wasfinally_____becauseofthebad weather.A.setupB.brokendownC.wornoutD.calledoff29.Antsarethemostcommonlifeformonearth,_____tiny,theircombinedweightisgreaterth anthatofthecombinedweightofallhumans.A.thoughB.althoughC.eventhoughD.asif30.Xiamenis mostbeautifulcoastcityandIbelieveIwillcomefor______sec ondtime.A.the,anB.a,aC.the,theD.a,t he31.Ourteamwasaheadduringthefirsthalf,butwe_____inthelasttenminutes.A.hadlostB.wouldloseC.werelosingD.lost32.Withalotofdifficultproblems ,themanagerfeltlikeacatonhotbricks.A.tosettleB.settlingC.settledD.beingsettled33.Peoplethinkthatthebeautyofthemountainsisgreatthan_____ofthedesert.A.oneB.theoneC.thoseD.t hat34.Drivingacarisnotasdifficultasyouimagine,ifyou therules.A.dependonB.believeinC.turntoD.stickto35.Wouldyoupleasemakeacopyforeverybodyintheofficeand_____extraonesforthevisitor s?A.otherB.manyC.fewD.some参考答案21.B22.A23.C24.A25.C26.B27.C28.D29.A30.B31.D32.A33.D34.D35.D******************************************************结束*****************************************************结束Ⅰ.单项填空1.(2018·济宁模拟)Therewereseveralmessagesfrompeople,mostof__________Ididn’tknow,onmyansweringmachinewhenIgothome.A、thoseB、whichC、whomD、them解析:选C。

人文英语4 形考任务 单元自测2(2020)

人文英语4 形考任务 单元自测2(2020)
A. Yes, I want.
B. No, thanks.
C. No, I wouldn't.
反馈
正确答案是:No, thanks.
题目3
未回答
满分10.00
标记题目
题干
The student were all entertained in a Mexican restaurant, at Professor Brian's ________
正确答案是:are lost
标记题目
信息文本
二、阅读理解:选择题(每题10分)
题目6
未回答
满分50.00
标记题目
题干
选择题
Since its founding in 1948, McDonald's has grown from a family burger(汉堡包)stand to a global fast-food chain, with more than 30,000 locations in 118 countries.
【考点】细节推理题
【详解】从题干中我们可以看出,这是一个反向选择题。让选出不正确的说法。我们可以用排除法。在三个选项中,有数字的有两个,A和C,A.麦当劳在1948年成立第一家,在文章第一句话就提到了。C.说的是麦当劳现在全世界有超过3万家门店。在文章第一段也提到了,故正确。而B选项说麦当劳在全世界每一座城市都有门店。请注意every一词用得太绝对,所以是错误的。故B为正确答案。
选择一项:
A. turn
B. run
C. change
反馈
译文:如果她想保持身材苗条,就必须在饮食有所改变。
正确答案是:change

《管理英语4》形考2选择填空题答案2

《管理英语4》形考2选择填空题答案2

选择填空题1. —How did your meeting go yesterday?—____________________actually, it was really frustrating.A. Not so goodB. Very goodC. Nothing special解析:本题考核“消极评价”的交际用语。

根据句意,第二说话人要表达的是负面评价,Very good不合题意,Nothing special所蕴含的消极程度与后面的frustrating也不匹配,所以答案是A。

2. Every time I tried to say something, he would ______ to something else.A. move offB. move onC. move over译文:每次我想发言的时候,他就改变了话题。

解析:动词短语move off“离开”,move on“结束某活动后改做其他的事”,move over“挪动”,根据语境,答案应该是B。

3. In today's environment, __________ people are often burned out, it's important for employees to have a personal connection with you and the work you believe in.A. whereB. whenC. while译文:在如今的工作环境下,人们常常筋疲力尽,让雇员们与你以及你所倚重的工作建立切身关系尤为重要。

解析:此处的从句为非限制性定语从句,修饰environment,根据句意,应使用关系副词where,正确答案是A。

4. What you need to do is to keep things short and sweet, just the ______.A. questionsB. topicsC. highlights译文:你要做的就是发言尽量简短和讨人喜欢,只需要说重点。

2013年文数选择填空小题训练2

2013年文数选择填空小题训练2

梅硐职中2013年文数小题训练22013年4月16日一、选择题(5*10)1、若集合A ={-1,1},B ={0,2},则集合{z |z =x +y ,x ∈A ,y ∈B }中的元素的个数为( )A. 5B. 4C. 3D. 22、函数y =a x-1a(a >0,且a ≠1)的图象可能是( )3.函数f (x )=2x -2x-a 的一个零点在区间(1,2)内,则实数a 的取值范围是( )A .(1,3)B .(1,2)C .(0,3)D .(0,2)4.已知曲线y =x 3在点(a ,b )处的切线与直线x +3y +1=0垂直,则a 的值是( ) A. -1 B. ±1 C. 1 D. ±35.已知函数f (x )=sin(2x +3π2)(x ∈R ),下面结论错误的是( )A .函数f (x )的最小正周期为πB .函数f (x )是偶函数C .函数f (x )的图象关于直线x =π4对称D .函数f (x )在区间[0,π2]上是增函数6.如图,正方形ABCD 中,点E 是DC 的中点,点F 是BC 的一个三等分点,那么EF =( )A.12AB →-13AD →B.14AB →+12AD →C.13AB →+12DA →D.12AB →-23→ 7.(改编题)已知等差数列{a n }满足a 2=0,a 6+a 8=-10,则a 2012=( )A .2010B .2012C .-2010D .-20128、如图,网格纸上小正方形的边长为1,粗线画出的是某几何体的三视图,则此几何体的体积为(A )6 (B )9 (C )12 (D )18 9、若点P (x ,y )到点F (0,2)的距离比它到直线y +4=0的距离小2,则点P (x ,y )的轨迹方程为( )A .y 2=8xB .y 2=-8xC .x 2=8yD .x 2=-8y10.执行如图所示的程序框图,则输出的结果为( )A .2B .1 C.12D .-1二、填空题(5*5) 11、计算ii i +-+1)1)(23(=12.抛掷甲、乙两枚质地均匀且四面上分别标有1,2,3,4的正四面体,其底面落于桌面,记所得的数字分别为x ,y ,则xy为整数的概率是________. 13.(改编题)已知椭圆G 的中心在坐标原点,长轴在x 轴上,离心率为32,且椭圆上一点到椭圆的两个焦点的距离之和为12,则椭圆G 的方程为________.14.已知向量a =(3,4),b =(2,-1),如果向量a +x b 与-b 垂直,则实数x 的值为________.15. 2012·湖北,文14若变量x ,y 满足约束条件⎩⎨⎧x -y ≥-1,x +y ≥1,3x -y ≤3,则目标函数z =2x +3y的最小值是________.6题图参考答案1、若集合A ={-1,1},B ={0,2},则集合{z |z =x +y ,x ∈A ,y ∈B }中的元素的个数为( )A. 5B. 4C. 3D. 2[解析] 由已知,得{z |z =x +y ,x ∈A ,y ∈B }={-1,1,3}, 所以集合{z |z =x +y ,x ∈A ,y ∈B }中的元素的个数为3. [答案] C2、函数y =a x -1a(a >0,且a ≠1)的图象可能是()[解析] 当a >1时,函数y =a x 单调递增,-1<-1a <0,所以y =a x -1a 的图象与y 轴的交点的纵坐标在0至1之间,所以选项A ,B 都不正确;当0<a <1时,函数y =a x单调递减,而此时-1a <-1,所以函数y =a x -1a 与y 轴的交点在x 轴的下方,选项D 符合条件. [答案] D3.(2012·北京朝阳区统考)函数f (x )=2x-2x-a 的一个零点在区间(1,2)内,则实数a的取值范围是( )A .(1,3)B .(1,2)C .(0,3)D .(0,2)[解析] 由条件可知f (1)f (2)<0,即(2-2-a )(4-1-a )<0,即a (a -3)<0,解之得0<a <3. [答案] C4.(2012·四川绵阳高三诊断)已知曲线y =x 3在点(a ,b )处的切线与直线x +3y +1=0垂直,则a 的值是( )A. -1B. ±1C. 1D. ±3[解析] 由y =x 3知y ′=3x 2,∴切线斜率k =y ′|x =a =3a 2. 又切线与直线x +3y +1=0⎝ ⎛⎭⎪⎫y =-13-13垂直,∴3a 2·⎝ ⎛⎭⎪⎫-13=-1,即a 2=1,a =±1,故选B. [答案] B5.(2012·银川联考)已知函数f (x )=sin(2x +3π2)(x ∈R ),下面结论错误的是( ) A .函数f (x )的最小正周期为π B .函数f (x )是偶函数C .函数f (x )的图象关于直线x =π4对称D .函数f (x )在区间[0,π2]上是增函数[解析] f (x )=sin(2x +3π2)=-cos2x ,故其最小正周期为π,故A 正确;易知函数f (x )是偶函数,B 正确;由函数f (x )=-cos2x 的图象可知,函数f (x )的图象关于x =π4不对称,C 错误;由函数f (x )的图象易知,函数f (x )在[0,π2]上是增函数,D 正确,故选C.[答案] C6.(2012·北京海淀期末)如图,正方形ABCD 中,点E 是DC 的中点,点F 是BC 的一个三等分点,那么EF →=()A.12AB →-13AD →B.14AB →+12AD →C.13AB →+12DA →D.12AB →-23AD → [解析] 在△CEF 中,有EF →=EC →+CF →,因为点E 为DC 的中点,所以EC →=12→.因为点F 为BC 的一个三等分点,所以CF →=23CB →.所以EF →=12DC →+23→=12AB →+23DA →=12AB →-23AD →.故选D. [答案] D7.(改编题)已知等差数列{a n }满足a 2=0,a 6+a 8=-10,则a 2012=( ) A .2010 B .2012 C .-2010D .-2012[解析] 设等差数列{a n }的公差为d ,则由已知条件可得⎩⎨⎧a 1+d =02a 1+12d =-10,解得⎩⎨⎧a 1=1,d =-1,所以数列{a n }的通项公式为a n =-n +2,故a 2012=-2012+2=-2010. [答案] C9、若点P (x ,y )到点F (0,2)的距离比它到直线y +4=0的距离小2,则点P (x ,y )的轨迹方程为( )A .y 2=8xB .y 2=-8xC .x 2=8yD .x 2=-8y[解析] 点P (x ,y )到点F (0,2)的距离比它到直线y +4=0的距离小2,说明点P (x ,y )到点F (0,2)和到直线y +2=0的距离相等,所以P 点的轨迹为抛物线,设抛物线方程为x 2=2py ,其中p =4,所以所求的轨迹方程为x 2=8y . [答案] C10.执行如图所示的程序框图,则输出的结果为()A .2B .1 C.12D .-1[解析] 根据程序框图可知,a =2,i =1;a =11-2=-1,i =2,a =12,i =3;a =2,i =4;a =-1,i =5……发现a 的值是以3为周期循环出现的.因为2012=3×670+2,当i =2012时,a =12,i =2013,此时退出循环,输出a =12,故选C.[答案] C 11、计算ii i +-+1)1)(23(=12.抛掷甲、乙两枚质地均匀且四面上分别标有1,2,3,4的正四面体,其底面落于桌面,记所得的数字分别为x ,y ,则xy________.[解析] 将抛掷甲、乙两枚质地均匀的正四面体所得的数字x ,y 记作有序实数对(x ,y ),共包含16个基本事件,其中xy为整数的有:(1,1),(2,2),(3,3),(4,4),(2,1),(3,1),(4,1),(4,2),共8个基本事件,故所求的概率为816=12. [答案]1213.(改编题)已知椭圆G 的中心在坐标原点,长轴在x 轴上,离心率为32,且椭圆上一点到椭圆的两个焦点的距离之和为12,则椭圆G 的方程为________.[解析] 设椭圆方程为x 2a 2+y 2b 2=1(a >b >0),根据椭圆定义知2a =12,即a =6,由ca =32,得c =33,b 2=a 2-c 2=36-27=9,故所求椭圆方程为x 236+y 29=1. [答案] x 236+y 29=114.已知向量a =(3,4),b =(2,-1),如果向量a +x b 与-b 垂直,则实数x 的值为________.[解析] 向量a +x b 与-b 垂直,所以(a +x b )·(-b )=-a ·b -x b 2=-2-5x =0,所以x =-25.故填-25.[答案] -2515. (2012·湖北,文14)若变量x ,y 满足约束条件⎩⎨⎧x -y ≥-1,x +y ≥1,3x -y ≤3,则目标函数z =2x+3y 的最小值是________.[解析] 作出可行域如图所示,由l 0:y =-23x 平移知过点A (1,0)时,目标函数取到最小值,代入可得z =2.[答案] 2。

工程经济填空选择题 (2)

工程经济填空选择题 (2)

填空题1现金流量应准确反映现金收支的实际发生(时间)。

2在正常情况下,需求与价格的关系价格越高,需求(越低)。

3劳动生产率是反映(活劳动)消耗的经济效益指标。

4资金等值计算所使用的系数的大小由利率和(计息期数)决定。

5比较实用的不确定性分析方法有盈亏平衡分析、(敏感性分析)和概率分析。

6计算费用法应用的前提条件是:各比较方案的(收益)相同。

7财务评价是根据国家现行(财税制度)和价格体系来分析、计算项目直接发生的财务效益和费用。

9按功能的重要程度来分,功能可分为基本功能和(辅助)功能。

10已知某设备目前需要修理,修理费用为4000元,该设备再生产价值为10000元,则该设备的有形磨损程度为(0.4 )。

11一台设备从开始使用到因技术落后而淘汰为止所经历的时间,称为设备的(技术寿命)。

12设备更新有原型更新和(技术)更新两种形式。

13实际成本与(标准)成本之间的差异额称为成本差异。

14编制费用预算的方法有:(1)(静态预算法),(2)弹性预算法,(3)零基预算法。

15生产成本的执行控制重点放在(基层)。

16现金流量图是反映工程项目在整个寿命周期内各年(现金流入)和(现金流出)状况的图解。

17随产品产量的增减而成比例增减的费用称为(可变成本)18产品的适用性是指产品满足使用者目的所具备的(技术性能)。

19投资效果系数是工程项目投产后每年取得的(净收益)与(投资总额)之比。

20在价值工程经济效益表中,节约倍数是指(全年净节约额)与价值工程活动经费之比。

21价值工程最重要的特征是(功能分析)。

22设备逐渐转移到成本中去并相等于其损耗的那部分价值叫做(折旧)。

23生产成本控制的程序是制定成本控制标准、揭示成本差异和及时纠正偏差24流动资金投资估算的方法有扩大指标估算法和分项详细估算法。

25总成本费用由制造成本、管理费用、财务费用和销售费用组成。

26当市场价格失真时,经济分析中不能直接采用市场价格,而应采用调整后的影子价格。

全国高中数学联赛选择填空训练题(2)

全国高中数学联赛选择填空训练题(2)

全国高中数学联赛选择填空训练题(2)一、选择题:(每小题6分,共36分)1.设集合A={a 1,a 2,a 3,a 4,a 5},B={a 12,a 22,a 32,a 42,a 52},a i (i=1,2,3,4,5)为正整数,且a 1<a 2<a 3<a 4<a 5,若A ∩B={a 1,a 4}, a 1+a 4=10,A ∪B 的元素之和为224,则a 5的值为( )A.8 B.9 C.10 D.112.一直线平分三角形的周长和面积,则该直线必通过三角形的( )A.外心B.内心C.重心D.垂心3.设四面体三组对棱分别相等,下面命题中正确的是( )A.四个面都是钝角三角形B. 四个面都是锐角三角形C.三个面是钝角三角形,另一面是锐角三角形D. 三个面是锐角三角形,另一面是钝角三角形4.已知实数x,y 满足4x 2-5xy+4y 2=5,w=x 2+y 2,则1w max +1w min的值为( ) A.45 B.85 C.16039 D.不存在5.某民航站有1到6个入口处,每个入口处每次只能进一个人,一小组9个人进站的方案数共有( ) A.C 514A 66 B.A 514A 66 C.C 514A 99 D.C 614A 996.连接凸五边形的每两个顶点总共可得到十条线段(包括边在内),现将其中的几条线段着上着颜色,为了使得心该五边形中任意三个顶点所构成的三角形都至少有一条边是有颜色的则n 的最小值是( )A.3 B.4 C.5 D.6二、填空题:(每小题9分,共54分)7.已知a<b<c<d<e 是连续的正整数,b+c+d 是完全平方数,a+b+c+d+e 是完全立方数,则c 的值是___________.8.已知x 0=2003,x n =x n-1+1x n-1(n>1,n ∈N),则x 2003的整数部分为___________ 9.已知x+2y+3z+4u+5v=30,则w=x 2+2y 2+3z 2+4u 2+5v 2的最小值为___________10.在棱长为a 的正方体内容纳9个等球,八个角各放一个,则这些等球最大半径是_______ 11.已知a,b,c 都不为0,并且有⎩⎪⎨⎪⎧sinx=asin(y-z)siny=bsin(z-x)sinz=csin(x-y),则有ab+bc+ca=__________. 12.已知a k ≥0,k=1,2,…,2003,且a 1+a 2+…+a 2003=1,则S=max{a 1+a 2+a 3, a 2+a 3+a 4,…, a 2001+a 2002+a 2003}的最小值为_________.(9提示:用柯西不等式:(a 2+b 2+c 2+d 2+e 2) (f 2+g 2+h 2+i 2+j 2)≥(af+bg+ch+di+ej)2. 答案:1.C.2.B.3.B.4.B.5.C.6.B.7.675.8.2003.9.60.10.0.5(23-3)a.11.-1.12.3/2007.。

选择填空 综合性练习 (2)

选择填空 综合性练习 (2)

选择填空( )1. I can see .A. two glass of milkB. two glasses of milkC. two glasses of milksD. two milks( ) 2. How much do you have at home?A. pearsB. cakesC. bananaD. rice( ) 3. There some bread and cakes on the table.A. areB. isC. hasD. have( ) 4. Don’t . The teacher is coming.A. sayB. speakC. tellD. talk ( ) 5. I can’t carry the box. Could you help ?A. myB.IC. meD. mine( )6.-- I want to take these things to the classroom. ?-- Certainly .A. What are theyB. How are thingsC. What about youD. Could you help me, please( ) 7. You can do .A. that like itB. it like thatC. it like itD. this like these ( ) 8. It’s a kite. Do you a go?A. thinkB. makeC. wantD. catch( ) 9. Can you play football?A. theB. aC. yourD. /( ) 10. Let your kite high, Jim.A. flyB. flyingC. fliesD. flys( ) 11. The room is dark. I can’t see anything.A. tooB. manyC. muchD. not( ) 12. You don’t like yellow. about this white one?A. WhichB. WhatC. WhyD. Who( ) 13. These are books. are over there.A. our;TheirsB. ours;TheirsC. our;TheirD.ours;Their( ) 14. They are a football matchon TV now.A. seeingB. watchingC. lookingD. looking at( ) 15. Can she sing this song? .A. I don’t think itB. I don’t think soC. I thing not soD. I think not( ) 16. I want____________these books in the box.A. putB. to putC. to takeD. take( ) 17. My brother and I ___________.A. is doing my homeworkB. are doing his homeworkC. are doing our homeworkD. are doing our homeworks ( ) 18.--How many knives are there in the pencil-box?--There aren’t ____________.A. someB. anyC. oneD. much( ) 19. What’s wrong with ___________?A. sheB. herC. heD. my( ) 20. Please have a cup of .A. an orangeB. a orangeC. orangesD. orange。

哈尔滨石油学院 第五章判断题选择题填空题(2)

哈尔滨石油学院 第五章判断题选择题填空题(2)

6.1.4放大器1.放大器及对它的要求放大器是传感器后处理电路的第一个环节, 它应具有高增益、高输入阻抗、低输出阻 抗、高稳定度、宽频带。

低零漂和低噪声等性能,这样便于信号的匹配和传输。

2.基本放大器的种类反相放大器: 如图)(a 所示,输入信号和反馈信号均加在运放的反相输入端,其增益为: 10R R u u F i vf -==A 同相放大器: 如图)(b 所示,输入信号加在同相输入端,而反馈信号加在反相输入端,其增益为: 101R R u u F i vf +==A 差动放大器: 如图)(c 所示,输出与两端的电压差成正比,用来放大差动信号其增益为:1120R R u u u F i i vf =-=A 交流放大器:如图)(d 所示,可用于低频交流信号的放大,其增益为:10Z Z u u F i vf -==A4–35 对于线性系统,当输入)(t x 、输出为)(t y 、系统的频率响应为)(f H 时,其输入输出的功率谱与系统的频率响应关系为_____。

A.)()()(2f S f H f S x y ∙= B. )()()(f S f H f S y x ∙-=C.)()()(f S f H f S y x ∙=D.)()()(f S f H f S y x ∙-=1.判断题 3-1 D A 转换就是把模拟信号转换成连续的数字信号。

3-2 只要采样频率足够高,在频域中就不会引起泄漏。

3-3 如果采样频率不能满足采样定理,就会引起频谐混叠。

3-4 只要信号一经截断,就不可避免地引起混叠。

3-5 对一个具有有限频谐)~0(c f 的连续信号采样,若满足12≥S c T f ,采样后得到的输出信号就能恢复为原来的信号(S T 为采样时间间隔)。

3-6 选择好的窗函数对信号进行截取,可以达到能量不泄露的目的。

3-7 正弦信号的自相关函数,使原有的相位信息保持不变。

3-8 若信号的自相关函数为脉冲函数,则其功率谐密度函数比为常数。

二、选择填空(本大题共15小题,每小题1分,满分15分)从每小题A、B、C、D四个选

二、选择填空(本大题共15小题,每小题1分,满分15分)从每小题A、B、C、D四个选

二、选择填空(本大题共15小题,每小题1分,满分15分)从每小题A、B、C、D四个选项中,选出一个可以填入空白出的最佳选项.26.(1分)﹣What's your _____to English learning,LinTao?﹣I think watching English movies is helpful.()A.place B.age C.time D.secret27.(1分)﹣Great!Our Women's volleyball team _____the gold medal in Rio Olympic Games on Saturday!﹣Yes.We see the great spirit of Chinese women's volleyball team once again!()A.won B.beat C.lost D.missed28.(1分)﹣Mrs.Gao often gets mad at her noisy son at home,but she is always ____her noisy pupils in the music class.﹣A good teacher,but a good mother.()A.angry with B.patient withC.worried about D.similar to29.(1分)In a soccer game,it's important for players to play together and _____the best in each other.()A.hand out B.leave out C.bring out D.take out30.(1分)﹣I believe we will achieve our China Dream earlier if all of us _______.﹣I agree.Let's do what we can from now on.()A.pull together B.have a pointC.pay attention D.keep our cool31.(1分)﹣Can you catch what the speaker is saying,Tina?﹣Sorry.He speaks so fast that I can _____understand him.()A.nearly B.hardly C.probably D.exactly32.(1分)﹣Would you like some milk or coffee,sir?﹣_______.Just a glass of water,please.()A.Both B.Either C.Neither D.None33.(1分)﹣Most of the wild animals are _____because of their bad living environment.﹣So we must do something to save them.()A.in need B.on duty C.at work D.in danger34.(1分)﹣Could you go to the new movie with me now?﹣Sorry,I _____.Look,it's time for me to watch The Reader on CCTV.()A.can't B.can C.needn't D.must35.(1分)﹣Can you tell me when you are going to arrive there?﹣I'm not sure.But I'll ring you up as soon as I _____there tomorrow.()A.arrive B.arrivedC.will arrive D.am going to arrive36.(1分)﹣Over 100 countries and organizations _____warm support to the Belt and Road initiative(倡议)since 2013.﹣Wonderful!Our circle of friends is growing bigger!()A.give B.have given C.gave D.will give37.(1分)The 24th Winter Olympic Games _____Beijing and Zhangjiakou in 2022,from February 4th to 20th.()A.is going to hold B.holdC.will be held D.was held38.(1分)﹣Mom,I took my partner's math book home by mistake.What should I do?﹣Well,you should call her_____ you can say sorry to her.()A.as if B.so that C.even though D.ever since39.(1分)﹣China is over years old.It's one of _____countries in the world.﹣Yes.It has much _____history than the USA.()A.old;long B.older;longerC.older;the longest D. the olders;longer40.(1分)﹣What did the manager ask you after the meeting?She asked me__________.()A.what I do for the project last weekB.if can I finish the work on timeC.how did I deal with the problemD.why I was late for the meeting三、完形填空(本大题共10 小题,每小题1 分,满分10 分)阅读下面的短文,根据短文内容从每小题所给的A、B、C、D 四个选项中,选出一个可以填入空白处的最佳选项,使短文意思完整、句子通顺,并在答题卡上将该项涂黑.I finished middle school in the 1970s.I still remember the teen years were the(41)time of my life.At that time,as a girl,I hated it when my parents asked me(42)about my problems that made me uncomfortable.I also remember many times when Mr.Templat,my teacher,would take me aside and talk to me.He had a special way of finding out what the problem was.Every time the(43)with me,I felt better.He was a teacher I will never (44).He had a way of making his classes enjoyable.We always got the highest(45)in math in our grade with his teaching.If there was a big world ball game on the radio,we would(46)everything and he would put the game on so we could all enjoy it.Teens often learn things on TV or film adults about world(47)that can make them scared.Now it is terrorism(恐怖主义).Back in my teen years it was the Cold War.It worried me so much that I(48)each day would be my last.Mr.Templat knew how much it troubled his(49).He opened the subject up to discussion.He gave us a way to express our fears and helped us understand war and politics(政治).When I think back to those special days,I appreciate (感念)that he helped me go(50)such a difficult time in my life.41.A.happiest B.hardest C.best D.busiest 42.A.directly B.politely C.kindly D.softly 43.A.played B.fought C.argued D.talked 44.A.fear B.trust C.forget D.remember 45.A.progress B results C.marks D.fever 46.A.do B.drop C.learn D.repeat 47.A.problems B.meetings C.weather D.pollution 48.A.thought B.decided C.promised D.suggested 49.A.relative B.family C.teachers D.students 50.A.against B.across C.over D.through.四、阅读理解(本大题共15 小题,每小题2 分,满分30 分)阅读下面三篇材料,根据材料内容从每小题所给的A、B、C、D 四个选项中,选出一个最佳选项,并在答题卡上将该项涂黑.ADear Sir or Madam.One of the teachers at my school in New York tells me that your school has summer course.I am planning to go to Beijing next summer and would like to take a short one﹣month course.I am 18 years old and have been studying Chinese for six years.I was born in the USA and have never been to China before.I am going to study Chinese at the university.I thing the course will help me improve my Chinese.Could you send me a catalogue(目录)and application form (申请表)?I would also like information about Beijing and other places nearby.I hope to do some travelling when the course is over.Thank you!I am looking forward to your replyVery truly yours,Jim Green 51.Jim Green is a student from.A.America B.China C.Canada D.Australia52.He was twelve year sold when he started to.A . go to school B.learn Chinese C.study in China D.travel in Beijing 53.How many times has he been to China before?A.Once.B.Twice.C.Many times.D.Never.54.He will come to China next summer to.A.improve his Chinese B.visit friendsC.look for jobs D.teach summer course55.He will probably after the summer course.A.graduate from university B.work in this schoolC.take a trip in Beijing D.post his application form.BMany kids do housework such as doing the dishes,making the bed,and folding the clothes.In exchange,they get some money or other computer time.Paying kids for housework is one of the most popular topics,especially at a time when everyone is more careful about money.Some parents think since adults are paid to do their jobs,we should pay kids for everyday housework.But some people don't think kids should get rewards(报酬)for doing housework.Susie Walton,an expert,believe hat by rewarding kids,parents are sending a message that work isn't worth doing unless you get something in return."Running any kind of housework is a team effort,"Walton said."A home is a living space for everyone in the family.It's important for kids to see that we all have responsibilities in the house,and families decide how they want their home to look,and how they are going to keep it looking like what they want."Other people believe that getting a reward encourages kids to do housework,and it also teaches them real world lessons about how we need to work to get money.There are also apps (程序)that gives kids points and digital gifts that can be redeemed(兑现)either online or in the real world."Our goal is to give kids lawful power so they can get rewards,"says Chris Bergman."And kids need rewards to help encourage them."56.Which of the following housework is NOT mentioned in Paragraph 1?A.Washing the dishes.B.Cooking meals.C.Folding the clothes.D.Making the bed.57.The underlined phrase"in return"in Paragraph 3has the same meaning as"".A.as a reward B.for punishmentC.on sale D.under control58.What's Walton's idea in the passage?A.Running exercise is a kind o f team work.B.People work to get some rewards.C.Kids have responsibilities in the house.D.Doing the housework in only the parents' job.59.According to Chris Bergman,kids should be encouraged to.A.do housework without rewards B.do more houseworkC.stay away from housework D.do housework be getting rewards60.Which is the best title for the passage?A.Kids Should Study as Well as Doing HouseworkB.Let Children Do Some HouseworkC.Should Kids Be Rewarded for Doing HouseworkD.Doing Housework Is Good for Children's Study.CLast summer I went to one of the world's most famous historical places,the Forbidden City in Beijing,China.It was the home of the emperors of the last two dynasties in China,the Ming and Qing Dynasties.The Forbidden City was built in 1420.The palace has over 10,000rooms.It was where the emperors dealt with the official business with their ministers.In Mandarin,The Forbidden City is called the Purple Forbidden City.However,the color of the palace itself is not purple.The color purple stands for power of the great emperors of China.It was so sacred(神圣的)that the commoners could not even dream of ever going in.The emperors also had some of the largest festival celebrations at the Forbidden City.During Chinese New Year,the emperor would invite all the members of his family and his officials to a banquet.The banquet had a hundred and eight Chinese dishes.It was such an expensive banquet that it could feed a commoner's family for three generations(代).Right now The Forbidden City is known as a historical site for tourists from all over the world.Everyone can go in there.It is a museum with priceless Chinese antiques (古董)and treasures in it.I really learned a lot about the Chinese culture and its history from this trip to The Forbidden City.It was like a dream come true to go on the trip and see the things that I have always wanted to see.61.How long is the history of the Forbidden City?A.About 600 years.B.More than 600 years. C. 1420 years.D.Over 10,000 years 62.We call the palace the Purple Forbidden City because the color purple is the symble for of the emperor.A.power B.fame C.wealth D.health63.What's the Chinese meaning of the underlined word"banquet"in Paragraph 4?A.表演B.比赛C.展览D.宴会64.Which of the following is NOT true about the Forbidden City in the passage?A.The Emperor lived there B.The wall of the CityC.It is a historical place for visiting D.The emperor had festival celebrations there 65.In the passage the writer wants to show us of the Forbidden City by comparing its past with present.A.the beauty B.the treasures C.the changes in use D.the building process.五、阅读还原(本大题共1小题,每小题5分,满分5分)阅读下面的短文,根据短文内容,从短文后的选项中选出能填入文中空白处的最佳选项.(提示:每个选项只用一次,选项中有一项为多余选项)Having a pen pal is fun and can be a great way to improve your writing skills.But most people have trouble knowing what to write to their pen pals.(66)(67)Break the ice by telling your pen pal a little about yourself.Start with your name,age and job.Write about what you like to do or what's on your mind that day.What you pass on will encourage your pen pal to tell you something about his.(68)Ask questions(69)This will help you get to know him and probably get you a faster answer.Make your questions into the e﹣mail by telling him something you like to do and then asking if he's ever tried it.▲Ask for advice.You may have some difficulties in your life and want to ask for advice.Your pen pal may tell you what to do.(70)Also,discussing real﹣world questions will promote(增进)your friendship.A.Share you information.B.What do you think of having a pen pal?C.And this will be helpful to start your friendship.D.Luckily,here are some ways to get to know a pen pal.E.Write questions for your pen pal to answer in his next e﹣mail.F.You don't have to take all his advice,but it will give your something about his opinions.六、完成句子(本大题共5小题,每小题2分,满分10分)阅读下列各小题,根据括号内的汉语提示,用句末括号内的英语单词完成句子.71.(2分)﹣Is Molly a talented girl?﹣Yes.She can draw and sing.And she____________(擅长跳舞)too.(be)72.(2分)By the time I joined Greener Group,they___________________(义务打扫图书室for 2 years . (volunteer)73.(2分)﹣Did he like to play games in his spare time?﹣No,he didn't.He said______________(玩游戏没有阅读有意义).(ask)74.(2分)﹣Is there anyone you admire in your life?﹣Well.I_______________________(崇敬那位帮我拜托困境的警察).(look)75.(2分)﹣Do you remember what Mr.Brown said to us at the graduation ceremony?﹣Yes.We___________________(受到告诫不要放弃对创造的兴趣)in our life.(warn)七、综合短文填空(本大题共10个空,每空1分,满分10分)阅读下面的短文,根据短文内容及首字母提示,在短文的空白处填入一个恰当的词,使短文内容完整、通顺.Life will be peaceful if you always do kind things.I teach my daughters to d(76) a habit of helping others.We live in a rural(乡村)area.Most of what we see is beautiful nature.One of the exceptions (例外)to the beauty is the rubbish that some people throw out of their car windows.And there are no necessary public s(77).Such as rubbish collection.A helping behavior(行为)that I often p(78)with my daughters is picking up rubbish in our neighborhood.My daughters often have a m(79)to see who can collect the most rubbish.They will often say to me in an excited voice,"There's some rubbish,﹣Daddy,stop the car!"Without t(80)more,we will often get out of the our car and pick it up.Though it may seem s(81),we do it.In fact,we enjoy it.We pick it up rubbish in parks,on sidewalks,almost a(82).One day I saw a man I had never met before picking up rubbish on the road.I stopped.He r(83)his head and said to me with a smile,"I saw you doing this with your family.It's a good idea to protect our natural world."There are many other ways to p(84)kindness for others.You may share a dinner with a beggar(乞丐),visit lonely old people in the nursing home,or help the blind cross the street.You can think of something that can be finished e(85)but helpful.It is fun,self﹣satisfying,and what's more,it can set a good example.Helping others is helping yourself.八、书面表达(本大题满分15分)"研学旅行"(study trip)是以组织中小学生集体旅行的方式走出校园,通过看工厂、访农村、赏山水、进教育基地等形式亲近社会与自然而开展的研究性学习与旅行体验相结合的校外教育活动.4月14日,襄阳电视台报道了我市中小学井喷式的研学旅行活动.消息播出后,引起了学生热议.有些学生表示欢迎,也有些表示反对.对此活动你持什么观点,请根据写作要点提示写一篇英语短文谈谈你的看法.1、写作要点提示:1)表明你对研学旅行活动的观点﹣你是赞同还是不赞同(只选一种观点);2)围绕你的观点详细陈述3条理由来说服同学们接受你的观点;3)针对你的观点简要谈谈你的期望或建议.2、注意事项:1)短文内容应包含提示的要点,可适当增加情节,以使行文连贯;2)词数:90词左右;3)文中不得出现个人姓名和学校名称.。

安全导论填空单选(2)

安全导论填空单选(2)

安全导论填空单选(2)填空26.出现网上商店等后,就有了B-C模式,即【企业】与【消费者】之间的电子商务。

27.典型的两类自动密钥分配途径有【集中式】分配方案和【分布式】分配方案。

28. -个好的散列函数h=H(M),其中H为【散列函数】;M为长度不确定的输入串;h为【散列值】,长度是确定的。

29.数据库的加密方法有【3】种,其中,与DBMS分离的加密方法是【加密桥技术】。

30.公钥证书系统由一个【证书机构CA】和【一群用户】组成。

26.最早的电子商务模式出现在【.企业】、【机构】之间,即B-B。

27.目前有三种基本的备份系统:简单的网络备份系统、【服务器到服务器的备份】和【使用专用的备份服务器】。

28.身份证明系统的质量指标之一为合法用户遭拒绝的概率,即【拒绝率】或【虚报率】。

29.基于SET协议电子商务系统的业务过程可分为【注册登记申请数字证书】、【动态认证】和商业机构的处理。

30.CTCA系统由【全国CA中心】、【省RA中心系统】、地市级业务受理点组成。

26.多层次的密钥系统中的密钥分成两大类:【数据】加密密钥(DK)和【密钥】加密密钥(KK)。

27.病毒的特征包括非授权可执行性、【隐蔽性】、【传染性】、潜伏性、表现性或破坏性、可触发性。

28. VPN解决方案一般分为VPN 【服务器】和VPN【客户端】。

29.身份证明技术,又称【识别】、【实体认证】、身份证实等。

30.密钥备份与恢复只能针对【解密密钥】,【签名私钥】为确保其唯一性而不能够作备份。

26.现在广为人们知晓的【传输控制】协议(TCP)和【网际】协议(IP),常写为TCP/IP。

27.计算机病毒具有正常程序的一切特征:【可存储性】、【可执行性】。

28. VPN利用【隧道】协议在网络之间建立一个_______通道,以完成数据信息的安全传输。

29.接入控制机构由【用户】的认证与识别、对【认证的用户】进行授权两部分组成。

30.实现身份证明的基本途径有【所知】、【所有】、个人特征。

选择、填空2

选择、填空2

专练21.设全集U 是实数集R ,集合M ={x |2x >2x},N ={x |2log (1)x -≤0},则(C UM )∩N =A .{x |1<x <2}B .{x |1≤x ≤2}C .{x |1<x <≤2}D .{x |1<x <2} 2.对任意复数z =a +bi (a ,b ∈R ),i 为虚数单位,则下列结论中正确的是 A . z -z =2a B .z ·z =|z |2C .z z=1 D .2z ≥03.双曲线244x 2-y =的离心率为A .6B .5C .62D .524.某学生在一门功课的22次考试中,所得分数如下茎叶图所示,则此学生该门功课考试分数的极差与中位数之和为A .117B .118C .118.5D .119.55.在△ABC 中,M 是AB 边所在直线上任意一点,若CM=-2CA+λCB,则λ= A .1 B .2 C .3 D .46.公差不为0的等差数列{n a }的前21项的和等于前8项的和.若80k a a +=,则k = A .20 B .21 C .22 D .23 7.设函数f (x )=3x 1-lnx ,则y =f (x )A .在区间(e 1,1),(1,e )内均有零点B .在区间(e 1,1),(1,e )内均无零点C .在区间(e 1,1)内有零点,在区间(1,e )内无零点D .在区间(e 1,1)内无零点,在区间(1,e )内有零点8.某几何体的三视图如图所示,则该几何体的表面积为A .2πB .22πC .(22+1)πD .(22+2)π9.已知函数f (x )是定义在R 上的增函数,则函数y =f (|x -1|)-1的图象可能是10.在△ABC 中,a ,b ,c 分别是角A ,B ,C 的对边,若22a b +=20142c ,则2tan tan tan (tan tan )A B C A B ⋅+的值为 A .0 B .1 C .2013 D .2014 11.若2013(21)x -=0a +1a x +22a x +…+20132013a x (x ∈R ),则12+2212a a +3312a a +…+2013201312a aA .-12013B .12013C .-14026D .1402612.四面体ABCD 中,AD 与BC 互相垂直,AD =2BC =4,且AB +BD =AC +CD =214,则四面体ABCD 的体积的最大值是A .4B .210C .5D .3013.圆2x 2+y -2x +my -2=0关于抛物线2x =4y 的准线对称,则m =_____________ 14.不等式组0130x y x x y ⎧⎪⎨⎪⎩--≤≥+-≤对应的平面区域为D ,直线y =k (x +1)与区域D 有公共点,则k 的取值范围是______. 15.运行如下程序框图对应的程序,输出的结果是_______ 16.设数列{n a }是等差数列,数列{n b }是等比数列,记数列{n a },{n b }的前n 项和分别为n S ,n T .若a 5=b 5,a 6=b 6, 且S 7-S 5=4(T 6-T 4),则7575a ab b ++=____________.。

选择、填空2

选择、填空2

2014年南平市初中数学升学考试 选择题、填空题专项训练(二)(满分:63分;考试时间:25分钟)一、选择题(本大题共9小题,每小题4分,共36分.每小题只有一个正确的选项)1.北京2008年第29届奥运会火炬接力活动历时130天,传递总里程13.7万千米,传递总里程用科学记数法表示为( )(A )1.37×105千米 (B )1.37×104千米 (C )1.37×103千米 (D )1.37×102千米 2.下列运算中,结果正确的是 ( )(A )844a a a =+ (B )523a a a =∙ (C )428a a a =÷ (D )()63262a a -=-3.不等式53-x <x +3的正整数解有( )(A )1个 (B )2个 (C )3个 (D )4个4.方程04142=----xxx 的解是 ( ) (A )3-=x (B )3=x (C )4=x (D )3=x 或4=x5.如图1,是张老师晚上出门散步时离家的距离y 与时间x 之间的函数图象,若用黑点表示张老师家的位置,则张老师散步行走的路线可能是( )6.如图2,AB//CD ,1051=∠,E EAB ∠=∠则,65的度数是 ( )(A )30 (B )40 (C )50 (D )60 7.如图3,是小玲在5月11日“母亲节”送给她妈妈的礼盒,图中所示礼盒的主视图是 ( )8.已知甲、乙两组数据的平均数分别是80x =甲,90x =乙,方差分别是210S =甲,25S =乙,比较这两组数据,下列说法正确的是( ) A .甲组数据较好 B .乙组数据较好C .甲组数据的极差较大D .乙组数据的波动较小9.随机掷一枚质地均匀的硬币两次,落地后至多有一次正面朝下的概率为 ( )(A )43 (B )32 (C )21 (D ) 41 二、填空题(本大题共9小题,每小题3分,共27分)10.分解因式:=-2282b a . 11.方程组⎩⎨⎧=-=+3,5y x y x 的解是 ___.12.如果2180a -=,那么a 的算术平方根是 .13.如图4,直线b a 、被直线c 所截,若b a //,1201=∠,则2∠的度数等于 .14.已知△ABC 中,90=∠C ,3cosB=2,AC=52,则AB= .15.师生做游戏,杨老师要随机将2名男生和2 名女生排队,两名女生排在一起的概率是 .16.如图6,在平行四边形ABCD 中,DB=DC 、65=∠A ,CE ⊥BD 于E ,则=∠BCE .17.某厂接到为汶川地震灾区赶制无底帐篷的任务,帐篷表面由防水隔热的环保面料制成.样式如图7所示,则赶制这样的帐篷3000顶,大约需要用防水隔热的环保面料 (拼接处面料不计) m 2.2.2π3.1≈≈,)18.某市出租车公司收费标准如图8所示,如果小明乘此出租 车最远能到达13千米处,那末他最多只有 元钱.2014年南平市初中数学升学考试 中档题专项训练(二)(满分:50分;考试时间:45分钟)三、解答题(本大题共8小题,共86分.请在答题卡...的相应位置作答) 19.(本题满分7分.)如图9所示,直线L 与两坐标轴的交点坐标分别是A (-3,0),B (0,4), O 是坐标系原点.(1)求直线L 所对应的函数的表达式;(2)若以O 为圆心,半径为R 的圆与直线L 相切,求R 的值. (2)(7分) 解不等式组2193127.x x x -⎧⎨-<+⎩≥,20.(8分) 先化简,再求值:()()3211123x x x x x --=---+,其中.21.(8分) 袋中装有红、黄、绿三种颜色的球若干个,每个球只有颜色不同.现从中任意摸出一个球,得到红球的概率为31,得到黄球的概率为21.已知绿球有3个,问袋中原有红球、黄球各多少个?22.(10分) 如图10,四边形ABCD 、DEFG 都是正方形,连接AE 、CG,AE 与CG 相交于点M ,CG 与AD 相交于点N .求证:(1)CG AE =;(2).MN CN DN AN ∙=∙23.(10分)某校教学楼后面紧邻一个土坡,坡上面是一块平地,如图12所示,AD BC //,斜坡AB 长m 10625,坡度5:9=i .为了防止山体滑坡,保障安全,学校决定对该土坡进行改造,地质人员勘测,当坡角不超过45时,可确保山体不滑坡.(1)求改造前坡B 到地面的垂直距离BE 的长;(2)为确保安全,学校计划改造时保持坡脚A 不动,坡顶B 沿BC 削进到F 处,问BF 至少是多少米?2014年南平市初中数学升学考试 综合题专项训练(二)(满分:36分;考试时间:40分钟)三、解答题(本大题共3小题,共36分.请在答题卡...的相应位置作答) 24.(10分) 5.12四川地震后,怀化市立即组织医护工作人员赶赴四川灾区参加伤员抢救工作. 拟派30名医护人员,携带20件行李(药品、器械),租用甲、乙两种型号的汽车共8辆,日夜兼程赶赴灾区.经了解,甲种汽车每辆最多能载4人和3件行李,乙种汽车每辆最多能载2人和8件行李.(1)设租用甲种汽车x 辆,请你设计所有可能的租车方案;(2)如果甲、乙两种汽车的租车费用每辆分别为8000元、6000元,请你选择最省钱的租车方案.25.(12分) 如图11,已知△ABC 的面积为3,且AB=AC ,现将△ABC 沿CA 方向平移CA 长度得到△EFA .(1)求四边形CEFB 的面积;(2)试判断AF 与BE 的位置关系,并说明理由;(3)若15=∠BEC ,求AC 的长.26.(14分) 如图13,在平面直角坐标系中,圆M 经过原点O ,且与x 轴、y 轴分别相交于()()8006A B --,、,两点.(1)求出直线AB 的函数解析式;(2)若有一抛物线的对称轴平行于y 轴且经过点M ,顶点C 在⊙M 上,开口向下,且经过点B ,求此抛物线的函数解析式;(3)设(2)中的抛物线交x 轴于D 、E 两点,在抛物线上是否存在点P ,使得ABC PDE S S ∆∆=101?若存在,请求出点P 的坐标;若不存在,请说明理由.。

可新剑桥B2 First (FCE)选择填空练习题二

可新剑桥B2 First (FCE)选择填空练习题二

可新剑桥B2 First (FCE) 填空训练题一、选择填空1.My brother hardly goes to the library, ________?a.Is itb.Isn’t itc.does hed.doesn’t he2.Either Lihua or one of his sons ____ the wedding banquet at the hotel next weekend.a.Is attendingb.Are attendingc.Had attendedd.Have been attending3.He was found guilty of dangerous driving and _____ from driving for five years.a.forbidb.forbidsc.forbiddend.had forbidden4.My sister and I often quarrel ____ our share of household chores at home.a.forb.withc.overd.between5.I saw the little boy ___ down the handrail of the staircase.a.glideb.glidesc.glidedd.was gliding6.The workers have just completed the construction of that building. They _____ three years tocomplete it.a.takeb.tookc.are takingd.were taking7.If John _______ his objection then, we would have taken his idea into consideration.a.raisedb.raisesc.has raisedd.had raised8._______ you are a member of the library, you cannot borrow any books till you pay all yourfines.a.Sinceb.Despitec.Thoughd.Nevertheless9.“Dorothy, you must keep this secret between you and _____”, Xiaohong pleaded.a.Ic.med.we10.This rude customer who was yelling at the cashier was oblivious ______ the crowd gatheringaround her.a.tob.atc.byd.with答案:c a c c a b d c c a二、同义词选择填空Lily rubbed her hands with chalk and studied the craggy cliff in front of her. It looked as if something huge had taken a bite out of its surface, with shapes (1) scattered all over it. Bu this was just a warm-up for Lily. In seconds, she spidered up the wall. She was hanging upside down, stuck to the smooth rock, like a lizard. Then Lily pulled herself up and jumped from one foothold to another, up the (2) sheer cliff. Down below, the spectators were enthralled with their mouths hung open.Lily started climbing at the age of six, groping up boulders in New York’s Central Park. A few years later, she was regarded as an (3) extraordinary child with exceptional talent. She later became the first female climber ever to (4) overcome the second most challenging boulder. At the gyms where Lily trained, everyone (5) could identify with her climbing style and sense of calm. “When I climb, I’m doing what I love to do”, Lily said.(1)a. spottedb. studdedc. speckledd. showered(2)a. rigidb. rockyc. steepd. straight(3)a. cleverb. heroicc. significantd. remarkable(4)a. crushb. conquerc. overthrowd. overpower(5)a. perceivedb. recognizedc. understoodd. appreciated答案:b c d b b。

天津中考填空选择练习2

天津中考填空选择练习2

天津21中 中考专项训练第二套一、单选1.在物理学中我们是以 “单位时间内物体通过路程的多少”来描述物体运动快慢的,而在文学作品中常常用一些成语来描述物体运动的快慢,下面的成语中与物理学描述运动快慢的方法最相近的是A .离弦之箭B .一日千里C .姗姗来迟D .风弛电擎 2.关于声现象的下列说法中,正确的是 A .声音在不同介质中的传播速度相同 B .如果音调和响度相同,声音我们就无法分辨 C .只要物体在振动,我们就能听到声音D .一切发声的物体都在振动3.猴子看见月亮在井水中就要去捞,结果什么也没捞到。

关于水中月亮离水面的远近,以下说法中正确的是A 、月亮就在水的表面上B 、井有多深,月亮就有多深C 、和天上月亮到水面的距离相等D 、和猴子的眼睛到水面的距离相等4.如图2所示的各种现象中,能够说明分子间存在引力的是图25.教室里投影仪的光源是强光灯泡,发光时必须用风扇给它降温。

为了保证灯泡不被烧坏,要求:必须先启动电动机带动风扇,然后才能控制灯泡发光;若没有开风扇,灯泡不能发光。

则下列设计的四个简化电路图(如图1所示)中符合要求的是6.根据如图4所示的两盏白炽灯的铭牌,可以知道A .甲灯一定比乙灯亮B .正常发光时,甲灯的电阻大于乙灯的电阻C .正常发光时,甲灯的电功率是乙灯电功率的4倍D .正常发光时,甲灯消耗的电能是乙灯消耗电能的4倍7.一个小朋友从滑梯上匀速下滑的过程中,下列说法正确的是图4D C ×M图4D C BA×M 图4D C BM×M图4BA××M图1 ABC图4甲 乙A .动能减小,重力势能减小,机械能减小 B. 动能减小,重力势能增大,机械能减小 C .动能不变,重力势能减小,机械能减小 D. 动能不变,重力势能减小,机械能不变8.在内燃机的四个冲程中,将内能转化为机械能的冲程是A. 吸气冲程B. 压缩冲程C. 做功冲程D. 排气冲程9. 如图2所示,当开关闭合后,发现小灯泡不亮,电流表无示数,用电压表测量发现U ab =0,U bc =6V ,U dc =0,若电路中只有一处故障,则其故障原因可能是 A .电流表断路了 B .小灯泡被短路了 C .开关接触不良 D .小灯泡灯丝断了10.如图6所示,甲、乙两物体质量相同,分别静止在水面下1 m和2 m 深处,由此可以判定A .甲物体受到的浮力大于乙物体受到的浮力B .甲物体受到的浮力小于乙物体受到的浮力C .甲物体受到的浮力等于乙物体受到的浮力D .无法判定甲、乙两物体受到的浮力的大小 二、多选11.如图所示,a 、b 两个不同的实心圆柱体,放在水平地面上,它们对地面的压强相等。

C语言填空选择判断(2)

C语言填空选择判断(2)

第一套1.C语言源程序文件的后缀是.C,经过编译之后,生成后缀为.OBJ的【目标】文件,经连接生成后缀.EXE的可执行文件.2.intx=2,y=3,z=4;则表达式x+y>z&&y==z的值为【0】.3.若s是int型变量,且s=6,则下面表达式的值是【1】.s%2+(s+1)%24.已知i=5,写出语句 a=i++;执行后整型变量a的值是【5】.5.以下程序运行结果是【503】void main(){inta=4,b=3,c=5,t=0;if (a<b)t =a;a =b;b =t;if(a <c)t =a;a =c;c =t;printf(" %d %d %d \n",a,b,c); }6.当a=3,b=2,c=1;时,执行以下程序段后c=【2】.if(a>b)a=b;if(b>c)b=c;else c=b;c=a;7.设有如下宏定义:#define SWAP(z,x,y){z=x,x=y,y=z}以下程序段通过宏调用实现变量A)b内容的交换.请填空将语句补充完整.int a=5,b=16,c;SWAP(【c】,a,b);8.以下do-while语句中循环体的执行次数是【3】.a=10;b=0; do{b+=2;a-=2+b;}while(a>=0);9.以下程序的输出结果是【4】 finclude<stdio.h>void main(){int a[3][3]={0,1,2,0,1,2,0,1,2},ij,s=1; for(i=0;i<3;i++)for(j=ij<=ij++) s+=a[i][j];printf("%d\n",s); }10.若输入1,2时,下列程序运行结果为【2】#define SWAP(a,b)t=b;b=a;a=tmain(){inta,b,t;scanf("%d,%d",&a,&b);SWAP(a,b);printf("%d\n",a);判断1.#include"stdio.h" 是每个程序中必须写的.❌2.整数 -32100可以赋值给int型和long int型变量. ✌️3.字符常量的长度肯定为1. ✌️4.表达式(j=3,j++)的值是4.❌5.若a和b类型相同,在执行了赋值语句a=b;后b中的值将放入a中,b中的值不变. ✌️6.设x、t均为int型变量,则执行语句"x=10;t=x&&x>10;"后,t的值为0. ✌️7.inti=3j=5; if(i>j);j++;elsei++;是正确的. ❌8.若有int i=10,j=0;则执行完语句 if (j=0)i+ +;else i - -;i 的值为11.❌9.for(i=0,k=-1;k=1;k++,i++)printf("*\n");是无限循环. ✌️10.循环嵌套执行时,先由内层循环进入外层循环. ❌11.int a[10];for(i=1;i<=10;i++)a[i-1]=i能使数组元素分别取值(1,2,3,4,5,6,7,8,9,10) ✌️12.数组说明int a[3][3]=(1,2,3,4,5,6,7};是正确的.❌13.C语言规定,函数返回值的类型是由在定义该函数时所指定的函数类型所决定的.✌️14.在程序中定义了一个结构体类型后,可以多次用它来定义具有该类型的变量.✌️15.int i=3,*p;p=&i;printf("%d",*p);是正确的✌️1.下列程序的输出结果是【560分钟<=>9小时20分钟】.#include<stdio.h>void main){inti=560,h,m;h=i/60;m=i-60*h;printf("%d分钟<=>%d小时%d分钟\n",i,h,m);}2. intx=2,y=3,z=4;则表达式x+y&&x=y的值为【1】3.20<x<30或x<-100的c语言表达式是【x>2&&x<30||x<-100】4.已知 i=5.6;写出语句 a=(int)i;执行后变量i的值是【5.6】5.当a=3,b=2,c=1;时,执行以下程序段后b=【1】.if(a>b)a=b;if(b>c)b=c;else c=b;c=a;6.有如下程序:#include<stdio.h>int max(int x,int y){intz;if(x>y)z=x;elsez=y;return(z); }void main()elsez=y;return(z); }void main(){inta=3,b=5;printf("%d\n",max(a,b)); } 运行结果为【5】7.当输入m,n值分别是49,21时,下列程序的执行结果是【7】main(){int m,n,;printf("please type in two positive integers)n"); scanf("%d%d",&m,&n); while(n){m=n;n=r;r=m%n; m=n; n=r;8.以下程序运行后的输出结果是【19】 #include<stdio.h>void main(){int aa[5][5]={{1,2,3,4),{5,6,1,8),{5,9,10,2},{1,2,5,6}}; inti,s=0;for(i=0;i<4;i++) s+=aa[i][2];printf("%d",s);}9.下列程序运行结果为【12.56】.#define PI 3.14#define S(r) PI*r*rmain(){float a,area;a=2;area=S(a);printf("%5.2fn",area);判断1.在C程序中,每行中只能写一条语句.❌2. 一个变量可以同时被定义为多种类型.❌3. #define 和printf 都不是C语句. ✌️4.若a=3,b=2,c=1 则关系表达式"(a>b)==c"的值为"真".✌️5.若a和b的类型相同,在执行了a=b;后,b中的值将丢失❌6.若a是实型变量,在执行了a=5;后,a将变为整型变量. ❌7.与 if(E)语句中的(E)等价的表达式是(E==0)❌.8.if语句后面的控制表达式只能使用关系表达式或逻辑表达式.❌9.循环结构中的continue语句是使整个循环终止执行❌10. do-while循环是先执行循环体语句,后判断表达式的值.✌️11.int a[10],1=3;scanf("%d",&a[1]);是正确的.✌️12.int a[3][4]={(1},{5),{9)); 它的作用是将数组各行第一列的元素赋初值,其余元素值为0_✌️13.进行宏定义时,宏名必须使用大写字母表示❌. 对结构体类型的变量的成员14.可以象普通变量一样参与各种运算. ✌️15.-个指针变量只能指向同一类型变量.✌️第三套1.一个C语言编写的程序是从【主函数】开始执行的.2.已知a=10,b=15,c=1,d=2,e=0,则表达式a*b&&c的值为【1】3.变量i、j、k已定义为int类型并有初值0,用以下语句进行输入: scanf("%d",&j);scanf("%d",&k);当执行以上输入语句,从键盘输入(<CR>代表回车键): 12.3 <CR>则变量i、j、k的值分别是【0,12,0】4.表示整数x的绝对值大于5”时值为“真"的c语言表达式是【x>5||x<-5】5.以下程序的输出结果是【0】#include < stdio.h> void main( )int a =5,b =4,c=3,d; d= (a>b>c);printf(" %d \n",d);}6.下面程序段的运行结果是【**】X=2;do{printf(*");x-;}while(x);7.若所用变量均已正确定义,则执行下面程序段后的值是【YESYES】for(i=0;i<2; i++) printf("YES"); printf("\n");8.在C语言中,一个函数一般由两个部分组成他们是【函数头部】和【函数体】9.从键盘输入12 345678 9执行后输出的结果是【15】main0int a[3][3],sum=0;for(i=0;i<3,i++) for(j=0;j <3;j++)scanf("%d",&a[iJj);printf("n");10函数的【递归】调用是一个函数直接或间接地调用它自身.判断1.在一个C程序中main函数必须出现在所有函数之前.❌2.r_1_2是C语言合法的用户定义标识符.✌️3.只有数字1代表逻辑值"真”.❌4.int a=7,b=9,t;t=(a> b)?a:b;t的值为7.❌5.设x、t均为int型变量则执行语句"x= 10;t=x&&x< = 10;"后,的值为1.✌️6.inta0={.15.8,6.7.,3.6,;for(i=0;i <4;i+ +)printf(" %d",a[i]):能输出数组元素a[2]的值,❌7.同一数组的元素在内存中存储是连续存放的,占有连续的存储单元。

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第9题中考选择填空精选21. 已知□ABCD的对角线BD =4cm ,将□ABCD 绕其对称中心O 旋转180°,则点D 所转过的路径长为( )A .4π cm B .3π cm C .2π cm D .π cm 2.设x 1、x 2 是一元二次方程x 2+4x -3=0的两个根,2x 1(x 22+5x 2-3)+a =2,则a3、如图,某河道要建造一座公路桥,要求桥面离地面高度AC 为3米,引桥的坡角ABC ∠为︒15,则引桥的水平距离BC 的长是_______米(精确到0.1米)。

4、如图,已知⊙P 的半径为2,圆心P 在抛物线1212-=x y 上运动,当⊙P 与x 轴相切时,圆心P 的坐标为___________。

5.如图6,在ABCD 中,AB =6,AD =9, ∠BAD 的平分线交BC 于点E ,交DC 的延长线于点F ,BG ⊥AE ,垂足为G ,BG =24,则ΔCEF 的周长为( )A .8 B .9.5 C .10 D .11.5 6.在Rt △ABC 中,∠C = 90°,∠B = 30°,BC = 4 cm ,以点C 为圆心,以2 cm 的长为半径作圆,则⊙C 与AB 的位置关系是( ). A .相离 B .相切 C .相交 D .相切或相交7.将直线 y = 2 x ─ 4 向右平移2个单位后,所得直线的表达式是__________ 8.如图,是二次函数y=ax 2+bx+c 图象的一部分,其对称轴为直线x =1,若其与x 轴一交点为A (3,0),则由图象可知,不等式ax 2+bx+c <0的解集是.9.如图,在等腰Rt △ABC 中,∠C =90O ,AC =6,D 是AC 上一点,若tAN ∠DBA =51,则AD 的长为( ) (A ) 2 (B ) (C )2 (D )1 10.一个高为,底面半径为2cm 的圆锥形无底纸帽,现利用这个纸帽的侧面纸张裁剪出一个圆形纸片(不考虑纸帽接缝),这个圆形纸片的半径最长可以是( )(计算结果保留3个有效数字。

参考数据41.12≈ 4 ,73.13≈2).A 3.12cm B 3.28 cmC 3.3 1cmD 3.00cm11.如图,已知O ⊙的半径为5,锐角△ABC 内接于O ⊙,BD ⊥AC 于点D ,AB =8, 则tan CBD ∠的值等于( )A .34 B .54 C .53 D .43 12.在△ABC 中,AB =AC =12cm ,BC =6cm ,D 为BC 的中点,动点P 从B 点出发,以每秒1cm 的速度沿B →A →C 的方向运动.设运动时间为t 秒,过D 、P 两点的直线将△ABC 的周长分成两个部分,使其中一部分是另一部分的2倍,那么t 的值为 . 13.已知:如图,在正方形ABCD 外取一点E ,连接AE 、BE 、DE .过点A 作AE 的垂线交DE 于点P .若AE =AP =1,PB 5 .下列结论:①△APD ≌△AEB ;②点B 到直线AE 的距离为2 ;③EB ⊥ED ;④S △APD +S △APB =1+ 6 ;⑤S 正方形ABCD =4+ 6 .其中正确结论的序号是( ) A .①③④ B .①②⑤ C .③④⑤ D .①③⑤ 14.已知△ABC 与△DEF 相似且对应中线的比为2:3,则△ABC 与△DEF 的面积比为_____________.15.在一个不透明的盒子里装有5个分别写有数字-2,-1,0,1,2的小球,它们除数字不同外其余全部相同. 现从盒子里随机取出一个小球,将该小球上的数字作为点P 的横坐标,将该数的平方作为点P 的纵坐标,则点P 落在抛物线y =-x 2+2x +5与x 轴所围成的区域内(不含边界)的概率是_____________.16.含有同种果蔬但浓度不同的A 、B 两种饮料,A 种饮料重40千克,B 种饮料重60千克现从这两种饮料中各倒出一部分,且倒出部分的重量相同,再将每种饮料所倒出的部分与另一种饮料余下的部分混合.如果混合后的两种饮料所含的果蔬浓度相同,那么从每种饮料中倒出的相同的重量是_____千克B Cx第18题A BC B ’ DEP第17题 ABCA 1A 2A 3B1 B2 B3 17.如图,△ABC 的面积为1,分别取AC 、BC 两边的中点A 1、B 1,则四边形A 1ABB 1的面积为34,再分别取A 1C 、B 1C 的中点A 2、B 2,A 2C 、B 2C 的中点A 3、B 3,依次取下去….利用这一图形,能直观地计算出3 4+3 42+3 43+…+34n =________.18..矩形纸片ABCD 中,AB =3,AD =4,将纸片折叠,使点B 落在边CD 上的B ’处,折痕为AE .在折痕AE 上存在一点P 到边CD 的距离与到点B 的距离相等,则此相等距离为________.19.函数x y =1,34312+=x y .当21y y >时,x 的范围是( ) A ..x <-1 B .-1<x <2 C .x <-1或x >2 D .x >2 20.若把函数y =x 的图象用E (x ,x )记,函数y =2x +1的图象用E (x ,2x +1)记,……则E (x ,122+-x x )可以由E (x ,2x )怎样平移得到?( ) A .向上平移1个单位 B .向下平移1个单位C .向左平移1个单位D .向右平移1个单位 21.如图,直线l 是经过点(1,0)且与y 轴平行的直线.Rt △ABC 中直角边AC =4,BC =3.将BC 边在直线l 上滑动,使A ,B 在函数xk y =的图象上.那么k 的值是( ) A .3 B .6 C.12 D .415 22.在△ABC 中,∠B =45°,COS ∠C =53,AC =5a ,则△ABC 的面积用含a的式子表示是 .23. 已知两圆的半径r 、R 分别为方程0652=+-x x 的两根,两圆的圆心距为1,两圆的位置关系是( ) A .外离 B .内切 C .相交 D .外切24. 正三角形的内切圆半径为1,那么这个正三角形的边长为25. 抛物线c bx x y ++=2图象向右平移2个单位再向下平移3个单位,所得图象的解析式为322--=x x y ,则B 、C 的值为( )A .B =2,C =2 B . B =2,C =0 C . B = -2,C =-1D . B = -3, C =226. 已知点(-1,1y ),(2,2y ),(3,3y )在反比例函数xk y 12--=的图象上. 下列结论中正确的是( )A .321y y y >>B .231y y y >>C .213y y y >>D . 132y y y >>27. 抛物线c bx ax y ++=2图象如图所示,则一次函数24b ac bx y +--=与反比例函数 a b c y x++=在同一坐标系内的图象大致为( )第15题图28. 如图,直角梯形ABCD 中,AD ∥BC ,AB ⊥BC ,AD = 2,将腰CD 以D 为中心逆时针旋转90°至DE ,连接AE 、CE ,△ADE 的面积为3,则BC 的长为 .29. 如图,扇形OAB ,∠AOB =90︒,⊙P 与OA 、OB 分别相切于点F 、E ,并且与弧AB 切于点C ,则扇形OAB 的面积与⊙P 的面积比是 .30. 已知二次函数)0(2≠++=a c bx ax y 的图象如图所示,有下列5个结论:① 0>abc ;② c a b +<;③ 024>++c b a ;④ b c 32<;⑤ )(b am m b a +>+,(1≠m 的实数)其中正确的结论有( )A . 2个 B . 3个 C . 4个 D . 5个 31.半径为r 的圆内接正三角形的边长为 .(结果可保留根号)xxxxAB CDPE32题图第38题图32.如图所示,矩形ABCD中,AB=4,BC=,点E是折线段A-D-C上的一个动点(点E与点A不重合),点P是点A关于BE的对称点.在点E运动的过程中,使△PCB为等腰三角形的点E的位置共有A.2个B.3个C.4个D.5个33.如图所示,点A是双曲线1yx=-在第二象限的分支上的任意一点,点B、C、D分别是点A关于x轴、原点、y轴的对称点,则四边形ABCD的面积是.34.如图所示,△ABC的三个顶点的坐标分别为A(-1,3)、B (-2,-2)、C (4,-2),则△ABC外接圆半径的长度为.35.根据如图所示的计算程序,若输入的值x =-1,则36.如图是一张直角三角形的纸片,两直角边AC=6 cm、BC=8 cm,现将△ABC折叠,使点B与点A重合,折痕为DE,则BE的长为()(A)4 cm(B)5 cm(C)6 cm(D)10 cm37.已知二次函数2y ax bx c=++(a≠0)的图象如图所示,则下列结论:①ac >0;②a–b +c <0;③当x <0时,y <0;④方程20ax bx c++=(a≠0)有两个大于-1的实数根.其中错误的结论有()(A)②③(B)②④(C)①③(D)①④38.如图,⊙O是△ABC的外接圆,AD是⊙O的直径,若⊙O的半径为6,S i nB=13,则线段AC的长是()A.3 B.4 C.5 D.639.现有球迷150人欲同时租用A、B、C三种型号客车去观看世界杯足球赛,其中A、B、C三种型号客车载客量分别为50人、30人、10人,要求每辆车必须满载,其中A型客车最多租两辆,则球迷们一次性到达赛场的租车方案有( ) A.3种B.4种C.5种D.6种40.一个不透明的口袋中,装有红球6个,白球9个,黑球3个,这些球除颜色不同外没有任何区别,丙从中任意摸出一个球,要使摸到黑的概率为14,需要往这个口袋再放入同种黑球_______________个.41.抛物线y=x2-4x+m2与x轴的一个交点的坐标为(1,0),则此抛物线与x轴的另一个交点的坐标是____________.42.Rt△ABC中,∠BAC=90º,AB=AC=2,以AC为一边,在△ABC外部作等腰直角三角形ACD,则线段BD的长为_______________.43.如图,在平面直角坐标系中,边长为1的正方形OA1B1C的对角线A1C和OB1交于点M1;以M1A1为对角线作第二个正方形A2A1B2M1,对角线A1 M1和A2B2交于点M2;以M2A1为对角线作第三个正方形A3A1B3M2,对角线A1M2和A3B3交于点M3;……,依次类推,这样作的第n个正方形对角线交点的坐标为M n_______________.44、已知二次函数2y ax bx c=++(0a≠)的图象如图所示,有下列结论:①240b ac->;②0abc>;③第37题第49题A第36题BCDE••第44题80a c +>;④930a b c ++<. 其中,正确结论的个数是( ) A 1 B 2 C 3 D 445.已知圆锥的底面半径长为5,侧面展开后得到一个半圆,则该圆锥的母线长为( ) A .2. B .5 C .10D .1546.已知⎩⎨⎧==12y x 是二元一次方程组⎩⎨⎧=-=+18my nx ny mx 的解,则n m -2的算术平方根为( )A .4 B .2 C . 2 D . ±247.一个边长为2的正多边形的内角和是其外角和的2倍,则这个正多边形的半径是( )A .2 B . 3C .1D .1248.一组数据如下:2,3,a ,5,6,它们的平均数是4,则这组数据的方差是 . 49.在平面直角坐标系中,以点)3,4(A 、)0,0(B 、)0,8(C 为顶点的三角形向上平移3个单位,得到△111C B A (点111C B A 、、分别为点C B A 、、的对应点),然后以点1C 为中心将△111C B A 顺时针旋转︒90,得到△122C B A (点22B A 、分别是点11B A 、的对应点),则点2A 的坐标是 . 50.把多项式2336x x +-分解因式的结果是51.已知圆锥的高是cm 30,母线长是cm 50,则圆锥的侧面积是 .52.符号“f ”表示一种运算,它对一些数的运算结果如下: (1)f (1)=0,f (2) = 1,f (3)=2,f (4)= 3,…… (2)1111()()()()23452,3,4,5ff f f ====…… 利用以上规律计算:1(2010)()2010ff -=53.已知下列命题:①若00a b >>,,则0a b +>; ②若a b ≠,则22a b ≠; ③角的平分线上的点到角的两边的距离相等;④平行四边形的对角线互相平分.其中原命题与逆命题均为真命题的个数是( )A .1个B .2个C .3个D .4个54.关于x 的一元二次方程2210x mx m -+-=的两个实数根分别是12x x 、,且22127x x +=,则212()x x -的值是( )A .1 B .12 C .13 D .2555.如图,在ABC △中,120AB AC A BC =∠==,°,,A ⊙与BC 相切于点D ,且交AB AC 、于M N 、两点,则图中阴影部分的面积是 (保留π).56.将一条长为20cm 的铁丝剪成两段,并以每一段铁丝的长度为周长各做成一个正方形,则这两个正方形面积之和的最小值 是 厘米。

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