练习3
管理学练习题3
管理学练习题一、填空题1.罗伯特·卡茨提出管理者要具备三类技能,即:技术技能,(人际)技能和(概念)技能。
2.根据享利·明茨伯格的研究,管理者的角色可被分为(人际)、(信息)和(决策)。
3.管理具有同社会化大生产,生产力相联系的属性,这是管理的(自然属性)。
4.权变理论认为,管理技术和方法同管理环境之间存在一种(权变)关系,企业管理的方式要随环境的变化而变化。
5.第一个提出管理五项职能的人是(法约尔)。
6.泰罗的科学管理理论的核心在于(提高效率)。
7.韦伯作为一个社会学家对管理学的贡献在于提出了一种理想的组织形式,这种理想的行政组织形式的权力基础是:(职务或职位)。
8.西蒙认为决策遵循的是(满意)原则,而不是最优原则。
9.滚动计划法是一种定期修订(长期计划)的方法。
10.政策指导矩阵(又称通用矩阵)是从(经营单位竞争能力)和(行业市场前景)两个角度来分析企业各个经营部位的现状和特征,并把它们标示在矩阵上,据此指导企业活动方向的选择。
11.管理幅度是指组织中上级主管能够(直接)地指挥和领导下属的数量。
12.赫茨伯格提出,影响人们行为的因素主要有两类即(保健)因素和(激励)因素。
13.公平理论主要讨论(公平性)对人们工作积极性的影响。
14.管理方格理论图中1·9型领导方式,表示领导者对(人)的关心程度高,对(生产)关心程度低。
15.根据时机、对象和目的不同,可以将控制分为三类:(前馈控制)(现场)控制,和反馈控制。
16.在管理控制中使用最广泛的一种控制方法是(反馈控制)。
二、单项选择题1.对于管理人员来说,一般需要具备多种技能,如概念技能、人际技能、技术技能.越是处于高层的管理者,其对于三种技能的需要就越是按以下顺序排列:( a )A.概念技能、人际技能、技术技能.B. 概念技能、技术技能、人际技能.C. 人际技能、概念技能、技术技能D. 技术技能、概念技能、人际技能2.当今国内外管理学教学的主流体系属于(d )理论。
统计学练习题3
第1-277题问题:企业的员工人数、工资是选项一:离散变量选项二:前者是离散变量,后者是连续变量选项三:连续变量选项四:前者是连续变量,后者是离散变量选项五:正确答案:2第2-175题问题:受极端数值影响最大的变异指标是()选项一:极差选项二:平均差选项三:标准差选项四:方差选项五:正确答案:1第3-1071题问题:两组数据的均值不等,但标准差相同,则选项一:均值小的差异程度大选项二:均值大的差异程度大选项三:无法判断选项四:两组数据的差异程度相同选项五:正确答案:1第4-621题问题:若一元线性回归模型的可决系数为0.9025,则自变量和因变量之间的相关系数可能为( ). 选项一:0.90选项二:0.95选项三:0.99选项四:0.41选项五:正确答案:2第5-1199题问题:变异是指()选项一:标志与指标的具体表现不同选项二:标志和指标各不相同选项三:总体的指标各不相同选项四:总体单位的指标各不相同选项五:正确答案:1第6-599题问题:在因变量的总离差平方和中,如果残差平方和所占的比重小,则两变量之间()。
选项一:相关程度高选项二:相关程度低选项三:完全相关选项四:完全不相关选项五:正确答案:1第7-997题问题:如果相关系数能说明两个变量之间存在相关性,则()。
选项一::1=ρH拒绝0H选项二::1=ρH,不能拒绝0H选项三::=ρH拒绝0H选项四::=ρH不能拒绝0H选项五:正确答案:3第8-1074题问题:某地2012年1-3月又新引进52个利用外资项目,这是()。
选项一:时点指标选项二:时期指标选项三:相对指标选项四:平均指标选项五:正确答案:2第9-611题问题:在一元线性回归模型中,总离差平方和的自由度为( );其中n为观测值的个数.选项一:n-1选项二:n-2选项三:n选项四:1选项五:正确答案:1第10-680题问题:如果所有商品的数量均按同一比率变化,计算出的派氏指数为105.45%,那么拉氏指数为()。
人教版(2023版)小学数学二年级上册:练习三
12.四个人拍球。
[教材P22 练习三 第12题]
(2)小红和小亮一共拍了多少个? 45+39=84(个) 答:小红和小亮一共拍了84个。
12.四个人拍球。
[教材P22 练习三 第12题]
(3)你能提出其他数学问题吗?列式算一算。
小红比小亮多拍多少个? 45-39=6(个)
12.四个人拍球。
[教材P22 练习三 第12题]
3 3
3 5
1
93 5
(第2、3个竖式答案不唯一)
[教材P21 练习三 第6题]Biblioteka 79 - 6712×
. 53 -4
49
×
7. [教材P21 练习三 第7题]
54-27= 27 . 54
- 27
27
66-49= 17 . 66
- 49
17
43-37= 6 . 43
- 37
6
95-63= 32
95 - 63
32
7. [教材P21 练习三 第7题]
72-9= 63 . 72
人教版(2023版)小学数学二年级上册
练习三
返回
1. [教材P20 练习三 第1题] 98 – 80 =18 98 – 8= 90
98 –(8 0 ) (1 8 )
98 –( 8 ) (9 0)
98 – 88=10
(9 8 ) –( 8 8 ) (1 0 )
2. [教材P20 练习三 第2题]
39-23 = 16 74-34 = 40
39 - 23
16
74 - 34
40
99-14 = 85
99 - 14
85
57-26 =31
C综合练习- 3 附参考答案
《C综合练习 3 --- 函数与指针》一、选择题1. 程序中调用了库函数strcmp,必须包含头文件()。
若是调用库函数gets呢?A、math.hB、string.hC、ctype.hD、stdio.h2.数组声明为“int y[4][3];”,表达式“*(y+2)+2-*y”的值为()。
A. 10B. 20C. 16D. 83.指针变量p1、p2类型相同,要使p1、p2指向同一变量,哪一个语句是正确的( )。
A、p2=*&p1;B、p2=**p1;C、p2=&p1;D、p2=*p1;4.数组定义为“int a[4][5];”,下列哪一个引用是错误的( )。
A、*aB、*(*(a+2)+3)C、&a[2][3]D、++a5.表达式“c=*p++”的执行过程是()。
A、复制*p的值给c后再执行p++B、复制*p的值给c后再执行*p++C、复制p的值给c后再执行p++D、执行p++后将*p的值复制给c6.函数strcmp("Int","int"))的返回值为。
A、0B、-32C、"intInt"D、"Intint"7.函数f定义如下,执行语句“sum=f(5)+f(3);”后,sum的值应为。
int f(int m){ static int i=0; int s=0;for(; i<=m; i++) s+=i;return s;}A、21B、16C、15D、88.下列语句定义x为指向int类型变量a的指针,其中哪一个是正确的。
A、int a,*x=a;B、int a,*x=&a;C、int *x=&a,a;D、int a,x=a; 9.声明语句为“int a[3][4];”,下列表达式中与数组元素a[2][1]等价的是。
A、*(a[2]+1)B、a[9]C、*(a[1]+2)D、*(*(a+2))+1 10.对于以下递归函数f,调用f (2) 的返回值是。
日语基础语法练习 (3)
読解・文法 総合練習問題Ⅰ _________の ところに 何を 入れますか。
1・2・3・4から いちばん いい ものを 一つ えらびなさい。
1 毎日 じてんしゃ _________がっこうへ 行きます。
1 に 2 で 3 を 4 は2 その チッケトは だれ_________もらいましたか。
1 を 2 は 3 が 4 に3 あさって サッカーの しあいは なんじに 始まる_________ 知っていますか。
1 で 2 に 3 か 4 を4 このまどから しんかんせんを とおるの_________みえます。
1 が 2 を 3 に 4 で5 こめ_________お酒をつくります。
1 にも 2 から 3 では 4 のは6 そのへやから へんな におい_________します。
1 は 2 で 3 に 4 が7 お母さんは 朝から もんく_________言っています。
1 しか 2 までに 3 ばかり 4 ずつ8 電車の なかで 足_________ふまれました。
1 の 2 を 3 へ 4 か9 日ようびは べんきょうが 忙しくて、どこ_________行きませんでした。
1 でも 2 へも 3 のは 4 ので10 これは なん_________いう どうぶつですか。
1 で 2 も 3 を 4 と11 きみ_________あたまがいい 人は いない。
1 では 2 ので 3 から 4 ほど12 2008年の オリンピック大会は ぺきん_________おこなわれます。
1 に 2 を 3 で 4 が13 これは しゅうりする_________つかいます。
1 ので 2 のを 3 のに 4 のが14 A「ジュース_________いかがですか。
」B「ありがとうございます。
」1 でも 2 まで 3 ほど 4 ごろ15 いえから かいしゃまで 三時間 _________かかります。
1 ぐらい 2 ごろ 3 まで 4 でも問題Ⅱ _______の ところに 何を 入れますか。
《大学英语(1)》阶段练习三及答案
《大学英语(1)》阶段练习三及答案华东理工大学网络教育学院《大学英语(1)》阶段练习3(一级)(Unit 5-Unit 6)Part I Vocabulary and structureDirections: Choose the best one from the four choices to complete the sentence and mark your answer on the Answer Sheet.1.Such a hardworking, honest, and promising young guy certainly ______ our help.A. reservesB. preservesC. deservesD. conserves2.The brain is one of the most ______ and complex organs in the body.A. weakB. delicateC. severeD. frail3.The scientist ______ his success not only to his parents, but also to those who back him up inhis work.A. lendsB. borrowsC. ownsD. owes4.The surviving sailors managed to keep up for several hoursand were ______ picked up by aship passing by.A. eventuallyB. solelyC. frequentlyD. firstly5.This ambitious young man will do anything to ______ his goals in life.A. receiveB. achieveC. believeD. relieve6.______ incidents take place frequently, which has been annoying the leaders of theneighboring countries for quite a long time.A. NationalB. BorderC. InternationalD. Territory7.Many people living in cities can no longer trust each other and have to ______ to varioussecurity systems to protect themselves.A. dependB. relyC. countD. resort8.Do you think what the space exploration has done can help to ______ the suffering of theearth?s starving millions?A. intendB. relieveC. sampleD. produce9.Although a millionaire, he often chooses ______ class while traveling by air.A. economyB. economicC. economicalD. economics10.The Student Union has launched a ______ to raise money for a sick student.A. championB. campaignC. champagneD. conquest11.I told them what was in my mind, but they decided to ______ my suggestion.A. neglectB. overlookC. missD. ignore12.If you have any questions concerning your new job, don?t ______ to ask me.A. dareB. relaxC. worryD. hesitate13.Don?t worry. I?m sure spilt coffee won?t leave ______ marks on the shirt.A. permanentB. excessiveC. previousD. necessary14.What made you ______ her of having taken the money?A. supposeB. suspectC. doubtD. charge15.Unless you possess ______ powers of foresight you are likely to find that the outcomeseldom matches the intention.A. slightB. sensibleC. extraordinaryD. reasonable16.Ten months later, Nixon himself ______ became the first American President to resign.A. reluctantlyB. willinglyC. separatelyD. delicately17.Weekends are no longer the ______ of a week for me sinceI quit my job and stayed home allday.A. highlightB. guidebookC. centerD. charm18.We don?t know when America has ______ from “the land of the free” to “the land of thelock”.A. translatedB. transferredC. transmittedD. transformed19.Parents tend to ______ their behavior, character and values to their children.A. pass awayB. pass byC. pass outD. pass on20.Tom ______ some French when he was in Paris on a business trip.A. picked outB. picked upC. picked offD. picked on21.The Internet, which used to ______ only ______ young people, has now become the interestof everybody.A. appeal…toB. rely…onC. take…toD. go…for22.The cause of the couple?s divorce lies ______ their dramatically different personalities.A. toB. withC. inD. at23.Classical music is ______ my taste, while my sister prefers pop music.A. forB. inC. atD. to24.Hi, Mary, you look very tired,Y eah, I ______ for a whole week.A. workedB. had workedC. have workedD. have been working25.Oh, Jane, you?ve bro ken another glass. Y ou ought ______ when you washed it.A. be carefulB. to careC. have caredD. to have been careful26.When I came in, I saw Dr. Li ______ a patient.A. examineB. examiningC. to examineD. examined27.They are all afraid of him and try their best to avoid ______ his name.A. to mentionB. mentioningC. to be mentioningD. mention28.______ with his daughter?s progress in her English learning,the father promised her a newMP3 the next week.A. SatisfyingB. To satisfyC. SatisfiedD. He was satisfied29.It is politely requested by the hotel management that radios ______ after 11 o?clock at night.A. were not playedB. not be playedC. not to playD. did not play30.Thank you for all your hard work last week. I don?t think we ______ it without you.A. can manageB. could have managedC. could manageD. can have managed31.He is always talking like that, as if the whole world ______ to him alone.A. had belongedB. belongedC. were belongingD. were belonged32.I can think of many cases ______ students obviously knewa lot of English words andexpressions but couldn?t write a good essay.A. whyB. whichC. asD. where33.People were perhaps more honest a long time ago when life was very different from ______it is today.A. whichB. thatC. whatD. how34.____ science has made enormous steps in making food more fit to eat, it has also made manyfoods unfit to eat.A. AlthoughB. BecauseC. UnlessD. After35.Only when I worked as a head teacher ______ how important it is to manage a class.A. I realizedB. I realizeC. did I realizeD. do I realizePart II Reading ComprehensionDirections: There are 4 reading passages in this part. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A, B, C and D. You should decide on the best choice and mark your answer on the Answer Sheet.Passage 1Have you ever noticed advertisements which say, “Learn a foreign language in 6 weeks, or your money back! From the firstday your pronunciation will be e xcellent. Just send …” and so on. Of course it never happens quite like that. The only language that is easy to learn is the mother tongue. And think how much practice that gets. Before the Second World War people usually learnt a foreign language in order to read the literature of the country. Now speaking the foreign language is what most people want. Every year many millions of people start learning one. How do they do it?Some people try at home with books and records or tapes; some use radio or television programs; others go to evening classes. If they use the language only 2 or 3 times a week, learning it will take a long time, like language learning at school.A few people try to learn a language fast by studying for 6 or more hours a day. It is clearly easier to learn the language in the country where it is spoken. However, most people cannot afford this, and for many it is not necessary. They need the language in order to do their work better. For example, scientists and doctors need to be able to read books and reports in the foreign language. Whether the language is learnt quickly or slowly, it is hard work. Machines and good books will help but they cannot do the student?s work for him.36.What do the advertisements mean?A. Y ou will learn a lot on the first day.B. Pronunciation is most important in language learning.C. Anyone can learn a foreign language without much money.D. It is possible to learn a language in less than 2 months.37.After the Second World War many people ______.A. found their mother tongue easy to learnB. learn to speak a foreign languageC. don?t learn to read in a foreign la nguageD. only learn to read in a foreign language38.Which, according to the writer, is the best place to learn a foreign language?A. Home.B. Evening classes.C. The country where the language is used.D. Places where people work.39.The writer of the passage thinks that ______.A. it?s difficult to learn a foreign languageB. it?s not necessary for many people to learn a foreign languageC. it?s not important whether a language is learned quickly or slowlyD. it?s much easier to learn a language toda y than in the past40.According to the passage, which statement is true?A. The mother tongue is easy to learn because it is an easy language.B. It is necessary for many of us to go abroad to learn a foreign language.C. Scientists and doctors want to speak an excellent foreign language, so they learn it.D. Though you have good machines and good books to help you learn a foreign language,you must work hard at it.Passage 2During the summer holiday there will be a different schedule for services for the university community. Specific changes for intercampus bus services, cafeteria (自助餐厅) summer hours for the school, hospital and recreational (娱乐的) and athletic (运动的) facilities (设施) will be posted on the bulletin board outside of thecafeteria. Weekly movie and concert schedules which are in the process of being arranged will be posted each Wednesday outside of the cafeteria.Intercampus buses will leave the main hall every hour on the half hour and make all of the regular stops on their route around the campus. The cafeteria will serve breakfast, lunch, and early dinner from 7 a.m. to 7 p.m. during the week and from noon to 7 p.m. on weekends. The library will maintain regular hours during the week, but shorter hours on Saturdays and Sundays. The weekend hours are from noon to 7 p.m..All students who want to use the library borrowing services and the recreational, athletic, and entertainment facilities must have a valid (有效的)summer identification card. This announcement will also appear in the next issue of the student newspaper.41.Specific schedule changes for which of the following facilities are listed in thisannouncement?A. Athletic and recreational.B. Food and transportation.C. Bookstore and post office.D. Medical and audio-visual.42.Times for movies and concerts are not listed in this announcement because ______.A. a film or concert occurs every Wednesday at 7 p.m.B. the full list would be too longC. films and concerts cannot be announced publiclyD. the full list is not ready yet43.According to the announcement, which of the following is true of special hours for thelibrary?A. It has them only on the weekends.B. It has them both weekdays and weekends.C. It has no special summer hours.D. This information is not available.44.According to the announcement, a valid identification card is required to ______.A. ride on intercampus busesB. read announcements in cafeteriaC. make use of the school hospitalD. check books out of the library45.The main purpose of this announcement is to help members of the university to ______.A. make better use of intercampus busesB. secure faster service in the cafeteriaC. make more effective use of campus facilitiesD. obtain extensions on overdue library booksPassage 3Vitamins are chemicals that are necessary to keep us alive. Each type of food contains at least one useful vitamin. For example, fresh fruit contains a lot of vitamin C.Many years ago, people didn?t know about vitamins. When somebody was sick because of lack of vitamins, the doctors didn?t know what to do. For example, they didn?t know a child with rickets (软骨病) needed foods containing vitamin D, e.g. milk, eggs and oily fish.Doctors found out about vitamins by accident. One day a girl aged 4 was ill. The doctors tried to cure her by taking blood from her body but this didn?t succeed. Other doctors put hot c oals on her forehead and used other harmful methods. All these …cures?failed. The girl became worse and worse.One day the girl?s mother was peeling (削皮) apples in the kitchen. The girl came in and ate some of the peel. The next day, her condition was better. The mother thought about the peel and gave her some more. After some days, the girl was much better. The girl?s mother told doctors what had happened. They investigated the chemicals in apple-peel. The results were very interesting, so the doctors started to investigate other food. They discovered the girl had been ill with scurry (坏血病), caused by a lack of vitamin C. In previous centuries, this disease had killed thousands of sailors. When the doctors found out about vitamins, they advised people to eat a variety of different kinds of food.Now, we know this advice is good. Each person needs to eat such things as rice, meat, fish, vegetables and fruit. Milk and butter are good, too.46.which of the following statements is right?A. None of food contains one useful vitamin.B. All of food doesn?t contain one useful vitamin.C. There is n o food which doesn?t contain any useful vitamin.D. All food contains many useful vitamins.47.Before the vitamins were discovered, if a child was sick with rickets, the doctors ______.A. let him/her eat milk, eggs and oily fishB. let him/her take some medicineC. let him/her drink much water and take a restD. didn?t know what to do48.The girl became worse and worse because ______.A. the doctor took blood from her bodyB. the doctor didn?t find a correct way to cure herC. the disease couldn?t be curedD. the doctor only used a common medicine49.According to the girl?s story, we can see ______.A. the peel of the apple can cure lots of diseasesB. as long as we often eat apples, we can?t suffer from diseasesC. vitamin C can cure scurryD. people can cure their own diseases without doctors50.Each person needs to eat a variety of different kinds of food ______.A. because they contain a lot of vitamins and can build up his healthB. in order to raise his living standardC. because of their different kinds of sweet smellD. though he is poor nowPassage 4Mr. Richards was quite good at shooting with a rifle, and he had taken part in several competitions in his small town. He had never actually won a prize, but each time he had done well, and once he had come fourth.Then he had to go to a big city on business for a month, and as he had nothing much to do in the evenings there, he joined the local rifle club, and spent several pleasant evenings shooting there.The rifle club had a very good team, which used to take part in a lot of important shooting competitions. One of these took place while Mr. Richards was with them, and of course he went to see it. But one of the members of the club?s team suddenly fell ill just before the match, and the captain had to choose somebody else to take his place in a hurry. He had heard that Mr. Richards had taken part in several competitions already, and hehad seen for himself at the club that, although he was not really up to the standard of the club?s first team, he was quite a good shot. He therefore invited him to take the sick?s place.Mr. Richards felt greatly honored to be asked to shoot for such a good team, but he also felt very nervous, because he was afraid of making a fool of himself and letting down his team.In fact, he was so nervous that he could not keep his hands from trembling while he was shooting, with the result that he did very badly in the competition. When he took his score card to his captain, he said, “After seeing my score, I feel like going outside and shooting myself.”The captain looked at the card for a few seconds and then said, “Well, you had better take two bullets with you if you do that.”51.Which of the following statements is true?A. Mr. Richards was not very skillful at shooting.B. Mr. Richards had won a prize once in a shooting competition.C. Mr. Richards had taken part in quite a few shooting competitions.D. Some of the team members in the club are not good at shooting, either.52.Why did Mr. Richards join the local rifle club when he went to a big city on business?A. Because he wanted to win a prize in shooting competitions.B. Because he didn?t have much to do in the evenings.C. Because he liked meeting people.D. Because he wanted to share his experiences with others.53.Why was Mr. Richards chosen to take the sick?s place?A. Because he had won shooting prizes.B. Because he had taken some competitions and was not a bad shot.C. Because he was as good a shot as any member of the club?s first team.D. Because the captain was sure that Mr. Richards would do well in the competition.54.Which of the following is true about Mr. Richards? shooting?A. He was nervous, but he managed to shoot well.B. He missed his target.C. He did badly because he was sick.D. His hands were trembling, so he couldn?t shoot w ell.55.What did the captain mean by saying “you had better take two bullets with you if you dothat??A. He was giving Mr. Richards suggestions.B. He was not that disappointed at Mr. Richards? score.C. He was very angry at seeing Mr. Richards? score.D. He was trying to make Mr. Richards less uneasy.Part III ClozeDirections: There are 20 blanks in each of the following passages. For each blank there are four choices marked A, B, C, and D. You should choose the one that best fits into the passage and mark your answer on the Answer Sheet.1When you read to learn English composition, you _56_ regard the language as the main thing. When you read a _57_ in English, do you read it for the story or for the English? This is a question that is not so foolish _58_ it may seem, _59_ I find that many students of English _60__ far more attention to the story _61_ tothe English. They read and enjoy and __62 a long time afterwards remember the story, but do not _63_ to study the use of words and _64_ in it. For instance, they know the plot (情节) of the story _65_ , but do not remember a _66_ sentence in the story and cannot tell _67_ preposition is used before or __68 a certain word in the speech of a certain character (人物).Of course, it is all right to read and _69_ and remember a story, and so long as one _70_ to know the story only, one need not _71_ about the language. But the case is quite different __72_ a student of English. I mean a student of English as distinguished (区别于) from a reader of stories or _73_ is called the general reader. As you may have _74_ from the above, a student of English should read very _75_ and regard the language as the main thing.56. A. ought B. need C. would D. ought to57. A. writing B. essay C. story D. report58. A. that B. as C. than D. as if59. A. for B. when C. since D. therefore60. A. take B. gain C put D. pay61. A. due B. than C. thanks D. rather62. A. during B. in C. for D. on63. A. care B. dream C. stop D. expect64. A. paragraphs B. letters C. terms D. phrases65. A. in heart B. from mind C. by heart D. to mind66. A. single B. simple C. long D. compound67. A. any B. what C. whether D. certain68. A. under B. after C. over D. behind69. A. enjoy B. ignore C. write D. realize70. A. does B. wants C. satisfies D. fails71. A. concern B. bring C. study D. bother72. A. of B. from C. with D. against73. A. which B. what C. that D. it74. A. arrived B. secured C. thought D. gathered75. A. carefully B. carelessly C. well D. hard2I met John on a 76 date in 1973. He was working in Long Island. I was instantly __77_ when I saw him. He had a tough 78_ , but a gentle and rich inner world. I _79_ that he was someone I wanted to spend my life with. We got married and lived _80_ with our four children. John attended to his work, _81_ I stayed home with the kids. We __82__ our little spare time with barbecues in the backyard. It was a quiet and happy _83 .Being a police officer?s 84 , I had to learn to assume the 85 until I hear otherwise. So on September 11, when hours went by with no word from my 86 , I didn?t panic. But immediately John?s brother Patrick walked 87 toward me, I los t it. “Do you have something to tell me?” I screamed. 88_ Patrick had to tell me was that my husband had gone into the __89_ , and was now missing.John was _90 . He was the last rescue worker pulled alive from the 91_ . Much of his lower body was crushed and large sections of destroyed muscles had to be 92 . Last Saturday, the family gathered in the backyard and friends were visiting. All of a sudden I realized things were quite 93 , though kind of back to normal.“Our lives have changed forever,” John says, “We need to be _94_ of the human suffering that went on that day. If we forget, we?re allowing ourselves to be set up for another 95 _.”76. A. invisible B. blind C. view D. visible77. A. delighted B. surprised C. confused D. attracted78. A. appearance B. task C. situation D. character79. A. wondered B. doubted C. decided D. pretended80. A. peacefully B. hardly C. mercifully D. difficultly81. A. and B. thus C. but D. although82. A. saved B. filled C. took D. won83. A. custom B. entrance C. culture D. experience84. A. mother B. leader C. wife D. daughter85. A. worst B. happiest C. unexpected D. best86. A. husband B. brother C. child D. father87. A. angrily B. cheerfully C. confidently D. hurriedly88. A. That B. Whether C. What D. When89. A. Trade Center B. White House C. Holly Wood D. Disney Land90. A. killed B. survived C. trapped D. sacrificed91. A. burning vehicles B. collapsed towers C. fallen planes D. ruined houses92. A. kept B. cured C. replaced D. removed93. A. the same B. different C. original D. exciting94. A. proud B. sure C. reminded D. required95. A. hit B. chance C. search D. gatheringPart IV Word FormationDirections: Fill in the blanks with the correct form of the words given in the brackets and mark your answer on the Answer Sheet.96.The young man was happy that the clothes he wore to the party were ______. (accept)97.Television has taken the place of motion picture as America?s most popular form o f ______.(entertain)98.Francis Chichester is ______ one of the greatest adventurers the world has ever known.(doubt)99.During the most ______ time in her career, she wrote two novels every year. (product) 100.Biotechnology has given us ______ tools to cope with waste, and turn it to our advantage.(add)101.The professor has read my paper and made some ______ as to how I should improve it.(suggest)102.Since the beginning of this semester, Laura has shown some ______ in both her reading and writing. (improve) 103.The legal ownership of the goods will remain with the seller until the ______. (deliver) 104.I had spent nearly two weeks on the research work, but they told me it was ______. (use) 105.The doctor not only gives medical treatment but offers ______ advice to all his patients as well. (help)Part V T ranslationDirections: Translate the following sentences into English.106.他小心翼翼地从窗户爬进去后,发现正站在妈妈面前。
习题3
金桥教育培训中心2012-2013学年度六年级提高班数学练习题31、小明家有若干只小鸡和小兔,已知鸡兔的头数与鸡兔的脚数之比是41 : 99,那么小鸡与小兔的只数之比是()2、x为正数,<x>表示不超过x的质数的个数,如<5.1>=3,即不超过5.1的质数有2,3,5共3个.那么<<19>+<93>+<4>×<1>×<8>>的值是.3、有25本书,分成6份。
如果每份至少一本,且每份的本数都不相同,有()种分法。
4、有3500个零件要分给甲、乙、丙三人在相同时间里加工完,已知甲加工25个零件与乙加工18个零件所用的时间相同,乙生产27个零件与丙生产23个零件所用的时间相同。
问甲、乙、丙三人各应加工多少个零件?5、一个数n的数字中为奇数的那些数字的和记为()S n,为偶数的那些数字的和记为()E n,例如()134134S=+=,()1344E=.()()12(100)S S S+++=_________;()(1)(2)100E E E+++=________ .6、某人买甲、乙两种铅笔共100支,已知甲铅笔每支1角5分,乙铅笔每支1角.若甲、乙两种铅笔用去的钱一样多,问甲、乙铅笔各买了多少支?7、把1,2,3,4,5,6分别填入左下图所示的表格内,使得每行相邻的两个数左边的小于右边的,每列的两数上面的小于下面的。
问:有几种填法?8、在50人的班级中,对学习语文、数学、英语三门学科的爱好作了调查,其中爱好数学的35人,其中爱好英语的30人,其中爱好语文的20人,数学与语文、数学与英语、语文与英语两门爱好者各有18人、22人、12人,三门学科都爱好的有10人,试问:三门学科都不爱好的有多少人?9、50名学生面向老师站成一行,按老师口令从左至右顺序报数:1,2,3,…….报完后,老师让所报的数是4的倍数的同学向后转.接着又让所报的数是6的倍数的同学向后转.问:现在仍然面向老师的有多少名同学?10、甲、乙、丙三人,甲每分钟行60米,乙每分钟行50米,丙每分钟行40米。
新北师大版小学一年级数学上册《练习三》教案
新北师大版小学一年级数学上册《练习三》
教案
教学目标
- 了解数学中的加法运算
- 掌握小于20之内的加法运算
- 运用加法进行简单的计算
教学内容
1. 数字0-20的认识和书写
2. 加法运算符号的认识和使用
3. 小于20之内的加法运算练
教学步骤
步骤一:数字的认识和书写(15分钟)
1. 准备数字卡片,展示数字0-20,并向学生解释每个数字的含
义和书写方法。
2. 请学生跟着老师一起大声读出每个数字,然后在纸上书写数
字零到二十。
步骤二:加法运算符号的认识和使用(10分钟)
1. 向学生展示加号“+”的符号,并解释它表示加法运算。
2. 请学生模仿老师的动作,用手指做出加法符号“+”的手势。
步骤三:小于20之内的加法运算练(25分钟)
1. 准备一些认识数字的卡片和计算题目卡片。
2. 将数字卡片随机分发给学生,让每个学生抽取一张数字卡片,并在黑板上写出这个数字。
3. 准备几道小于20之内的加法题目,例如:2 + 3 = ,4 + 5 = ,7 + 8 = ,等等。
4. 让学生根据题目上的两个数字,使用加法进行计算,并在纸
上写出答案。
5. 鼓励学生互相检查答案,并与同桌讨论。
总结与反思
本节课主要学习了小于20之内的加法运算。
通过数字的认识
和书写,加法运算符号的认识和使用,以及小于20之内的加法运
算练习,帮助学生掌握了加法的基本概念和运算方法。
在教学过程中,学生们积极参与,表现出了良好的学习兴趣和学习能力。
需要
进一步关注学生的基本计算能力,帮助他们提高快速计算的能力。
〖程序设计基础〗练习题3及答案
〖程序设计基础〗练习题3一、单选题(30分)语言是( )。
A.面向问题的解释型高级编程语言B.面向机器的低级编程语言C.面向过程的编译型高级编程语言D.面向对象的解释型高级编程语言2.下列的变量定义中,错误的是( )。
A) int i; B) int i=;C) static int i=100; D) int 123_$;3.以下的变量定义语句中,合法的是( )。
A) float $_*5= ; B) byte b1= 15678;C) double a =Double. MAX_VALUE;D) int _abc_ = 3721L;4.以下字符常量中不合法的是( )。
A) '|' B) '\'' C) "\n" D) '我'5.若以下变量均已正确定义并赋值,下面符合Java语言语法的语句是( )。
A) b = a!=7 ; B) a = 7 + b + c=9;C) i=* % 4; D) a = a + 7 = c + b;6.下列程序段执行后t5的结果是( )。
int t1 = 9, t2 = 11, t3=8;int t4,t5;t4 = t1 > t2 t1 : t2+ t1;t5 = t4 > t3 t4 : t3;A) 8 B) 20 C) 11 D) 97.设 a, b, c, d 均为 int 型的变量,并已赋值,下列表达式的结果属于非逻辑值的是( )。
A) a!=b & c%d < a B) a++ = =a+b+c+dC) ++a*b--+d D) a+b>=c+d8.执行下列程序段后,b, x, y的值分别是( )。
int x=6,y=8;boolean b;b=x>y&&++x==--y;A) true , 6, 8 B) false , 7, 7C) true, 7, 7 D) false, 6, 89.以下由do-while语句构成的循环执行的次数是( )。
练习3及答案
选择第7题C
选择第8题D
选择第9题A
选择第10题A
选择第11题B
选择第12题B
二、填空题答案
填空第1题protected;default;public
填空第2题Object
填空第3题ng.Character;ng.Boolean
填空第4题
What a pleasure!
void foo(double d,final float f){
String s;
final boolean b;
class Inner{
void methodInner(){
System.out.println("in the Inner");
}
}
}
public static void main(String args[])
{
Outer1 me=new Outer1();
me.foo(123,123);
System.out.println("outer");
}
}
A in the Inner outer
B outer
C in the Inner
D编译不通过
二、填空题
1.Java中类成员的限定词有以下几种:private, public,_____________,_____________。其中,_____________的限定的范围最大。
SimpleDateFormat formatter = new SimpleDateFormat ("yyyy.MM.dd G 'at' hh:mmTime = new Date();
try {
分数应用题三
分数应用题三解题方法与策略:1、一些复杂分数应用题由于数量多,关系复杂隐蔽,或单位“1”难统一等原因,要直接列式解答比较困难,这时,可以列方程解答。
列方程解分数应用题关键是要根据题意,找准等量关系。
2、一般情况下,在分数应用题中,设单位“1”的量为未知数。
3、对于含有两个等量关系的题目,其中一个设未知数,另一个列方程。
【例题1】有一个分数,分子、分母之和是23,分母增加19以后,得到一个新的分数。
把这个新分数化为最简分数是51,则原来的分数是几分之几?【练习1】1、有一个分数,它的分母比分子多4,如果把分子、分母都加上9,得到的分数化为最简分数后是97,这个分数是多少?2、金放在水里称,重量减少191;银放在水里称,重量减少101。
一块重770克的金银合金放在水里称,重量减少了50克。
这块合金含金、银各多少克?【例题2】有一堆橘子若干个,把其中的31给A,余下的51少3个给B ,再把余下的全部给C,这样C 得到的个数比A 得到的多21个,这堆橘子共有多少个?【练习2】1、有两队小朋友做游戏,甲队比乙队的43还多10人。
若乙队给甲队10人,则甲队是乙队的54,求两队原来有多少人?2、今年小蒙的年龄相当于喻老师年龄的41。
11年后,小蒙的年龄又正好是喻老师的52,今年喻老师多少岁?【例题3】某商店购进一批水果,梨和香蕉占总数的169,梨和苹果的重量比总数的85少25千克,梨有125千克,香蕉有多少千克?【练习3】1、某校学生人数中,低、中年级占总人数的127,中、高年级比总人数的32多11人,中年级有80人,那么全校有多少人?2、甲、乙、丙三人都有一些零花钱。
已知甲、乙两人的钱数比总数的21还多100元,乙、丙两人的钱比总数的43少20元,乙有160元,三人共有多少元?【例题4】某班的男生人数比全班人数的95少4人,女生人数比全班人数的52多6人,那么这个班男生比女生少多少人?【练习4】1、一根铁丝,第一次用去全长的31多3米,第二次用去第一次的32,还剩下3米。
金融学练习题3
一、单选题1、世界大多数国家的中央银行采用()A、单一型B、复合型C、跨国型D、准中央银行型答案: A2、下列中央银行的行为和服务中,体现其银行的银行的职能是()A、代理国库B、对政府提供信贷C、集中商业银行现金准备D、发行货币答案: C3、中央银行是国家的银行,它代理国库,集中()A、国库存款B、企业存款C、团体存款D、个人存款答案: A4、中央银行在经济衰退时,()法定准备率A、调高B、降低C、不改变D、取消答案: B5、各国中央银行货币发行准备基本上包括两种:一是现金准备,二是()A、商品保证准备B、票券保证准备C、外汇保证准备D、信用保证准备答案: B6 中央银行若提高再贴现率,将()A、迫使商业银行降低贷款利率B、迫使商业银行提高贷款利率C、使商业银行没有行动D、使企业得到成本更高的贷款答案: B7.根据票据交换理论,再多家银行参加的票据交换和清算的情况下,各行应收差额的综合一定()各行应付差额的总和。
A、大于B、小于C、等D、可能大于,也可能小于答案:C8、中国人民银行行行使中央银行职能,于( )首次规定各专业银行缴存存款准备金的办法A、1983年B、1985年C、1984年D、1986年答案: C9、商业银行派生存款的能力()A、与原始存款成正比,与法定存款准备率成正比B、与原始存款成正比,与法定存款准备率成反比C、与原始存款成反比,与法定存款准备率成反比D、与原始存款成反比,与法定存款准备率成正比答案: B10、假定原始存款为200万元,准备率为20%,现金漏损率为30%,存款总额可扩大为()A、615万元B、750万元C、655万元D、520万元答案:D11、中央银行再贴现率的调整主要着眼于( )的考虑。
A、短期B、中期C、长期D、年度答案:A12、在中央银行初创时期,最早设立的中央银行是()A、英格兰银行B、美国联邦储备体系C、瑞典里克斯银行D、德意志银行答案: C13、下列银行中,不同于其他三家银行的是()A、英格兰银行B、东京---三菱银行C、中国银行D、花旗银行答案:A14、下列针对中央银行负债的变动中,使商业银行体系准备金增加的是()A、财政部在中央银行的存款增加B、外国在中央银行的存款增加C、流通中的通货减少D、其他负债的增加答案: C15、在下列针对中央银行资产项目的变动中,导致准备金减少的是()A、央行给存款机构贷款增加B、央行出售证券C、向其他国家中央银行购买外国通货D、中央银行增加在国外存款答案:B二、多项选择题1、中央银行是()A、发行的银行B、国家的银行C、银行的银行D、监管的银行答案:ABC2、中央银行的作用有()A、稳定货币与稳定经济B、调节信用于调节经济C、集中清算,加速资金周转D、开展国际金融的合作与交流答案:ABCD3、中央银行的‘银行的银行’的职能体现在()A、集中存款准备B、金融监管C、最终的贷款人D、组织全国的清算答案: ACD4、中央银行的活动表正是()A、不以盈利为目的B、不经营普通银行业务C、制定货币政策是具有相对独立性D、 AC选项答案: ABC 5中央银行的三大政策工具是()A、法定准备金率B、再贴现C、公开市场业务D、信用配额答案:ABC6、中央银行要实现"松"的货币政策可采取的措施有()A、提高法定存款准备金率B、降低再贴现率C、提高证券保证金比率D、在公开市场上购买有价证券答案: BD7、以下属于人民币发行保证的有()A、掌握在国家手中的生产资料和生活资料B、商业票据C、黄金储备D、外汇储备答案: ABCD8、中央银行公开市场业务较其他货币政策工具的优越性明显体现在()A、直接性强B、主动性好C、作用力大D、灵活性好答案: BD9、中央银行直接信用控制工具包括()A、利率最高限B、信用配额C、规定商业银行的流动比率D、直接干预答案:ABCD10、中央银行金融监管的目标包括()A、金融体系经营安全性B、公平竞争目标C、政策的协调一致目标D、一元化监管答案: ABC一、单项选择题1、马克思关于流通中货币量理论的假设条件是()。
Exercise 3练习题
Ⅰ. Match the examples on the left with the correct meaning of the underlined prefixes on the right.Ⅱ. Choose a word from the examples in ExerciseⅠto fill each gap. Write it in the correct form.1.We were all surprised when the king ______________________in favour of his son.2.I was so sad to hear of your uncle’s death. Please give your aunt my _____________.3.After his operation, the patient was fed ____________for several days.4.After four years in the company, he was finally _____________to senior manager.5.If the pilot presses this button, he _____________himself from the plane.6.We asked for _____________rooms at the hotel but they actually put us on differentfloors.7.It’s such a small island that most of the families there are _______________.8.The machine has started ________________ a strange, high-pitched sound.9.A lot of small businesses these days are finding it hard to stay _____________.10.D o you believe that there are ________________beings in outer space?Ⅲ. Match the roots from box A with suitable suffixes from box B to create new words. Use each root and suffix once only.A.B.Ⅳ. Complete these sentences using the suffixes from box B in exerciseⅢ. Use each suffix once only.1.She’s a highly ambitious, career-___________young woman.2.If you want to go swimming with a watch on it will have be water__________.3.He was guilt-__________ when he realized it was all his fault.4.Hilary’s a trust________________ person. I can think of no one better for the job.5.The British are thought to be more class-____________ than the Americans.6.Three staff-______________ protests have taken place in the company in the lastfew months.7.Sugar-_________ chewing gum is better for your teeth than the sugary stuff.8.Athletes often follow a protein-_________ diet to help build their muscles.9.I don’t want to discuss work-__________ issues outside of office hours.10.I don’t really think the new plan is work______________.。
2024年新高考改革适应性练习(3)(九省联考题型)数学卷及答案
2024年新高考改革适应性练习(3)(九省联考题型)数学试题卷(2024.2.6)考生须知1. 本卷共4页,四大题19小题,满分150分,答题时间120分钟;2. 答题时须在答题卡上填涂所选答案(选择题),或用黑色字迹的签字笔规范书写答案与步骤(非选择题),答在本试题卷上或草稿纸上的答案均属无效;3. 考试结束时,考生须一并上交本试题卷,答题卡与草稿纸.一、单项选择题(本题共8小题,每小题5分,共40分.在每小题给出的四个选项中,只有一项是符合题目要求的.)1. 设样本空间ΩΩ={1,2,…,6}包含等可能的样本点,且AA={1,2,3,4},BB={3,4,5,6},则PP(AABB)= A.13B.14C.15D.162. 若复数zz满足zz2是纯虚数,则|zz−2|的最小值是A.1 B.√2C.2 D.2√23. 算术基本定理告诉我们,任何一个大于1的自然数NN,如果NN不为质数,那么NN可以唯一分解成有限个素因数的乘积的形式.如,60可被分解为 22×31×51,45可被分解为 32×51.任何整除NN的正整数dd都叫作NN的正因数.如,20的正因数有1,2,4,5,10,20.则4200的正因数个数是A.4 B.7 C.42 D.484. 已知点(aa,bb)在直线 2xx+yy−1=0 第一象限的图像上,则1aa+1bb的最小值是A.3+2√2B.2+2√2C.1+2√2D.2√25. 已知函数ff(xx)=sin xx,gg(xx)=cos xx,则ff�gg(xx)�和gg�ff(xx)�都单调递增的一个区间是A.�2ππ5,4ππ5�B.�4ππ5,6ππ5�C.�6ππ5,8ππ5�D.�8ππ5,2ππ�6. 已知直线ll过点(2,1),且与两坐标轴围成的三角形的面积是6,则满足条件的直线ll共有A.1条B.2条C.3条D.4条7. 我们记ff(nn)(xx)为函数ff(xx)的nn次迭代,即ff(1)(xx)=ff(xx),ff(2)(xx)=ff�ff(xx)�,…,ff(nn)= ff�ff(nn−1)(xx)�.已知函数gg(xx)=xx|xx|,则gg(2024)(xx)=A.xx3|xx|2021B.xx4|xx|2020C.xx2|xx|2022D.xx20248. 若一四面体恰有一条长度大于1的棱,则这个四面体体积的最大值是A.√33B.12C.13D.√22二、多项选择题(本题共3小题,每小题6分,共18分.在每小题给出的选项中,有多项符合题目要求.全部选对的得6分,有选错的得0分,若只有2个正确选项,每选对一个得3分;若只有3个正确选项,每选对一个得2分.)9. 已知函数ff(xx)=xx3−2xx,下列说法正确的是A.函数gg(xx)=ff(xx)+ff′(xx)无零点B.直线 2xx+yy=0 与yy=ff(xx)相切C.存在无数个aa>0 ,ff(xx)在区间(−aa,aa)上不单调D.存在mm>0 ,使得对于任意nn,ff(nn)≤ff(nn+mm)10. 若一个人一次仅能爬1级或2级台阶,记aa nn为爬nn级台阶时不同的爬法数(nn∈NN∗).关于数列{aa nn},下列说法正确的是A.函数ff(nn)=aa nn单调递增B.aa1+aa3+aa5的值为12C.aa1+aa2+⋯+aa10=232D.2aa12+aa22+⋯+aa102=89×14411. 如右图,已知抛物线CC的焦点为FF,准线方程为ll:xx=−1 ,点PP是CC上的一动点.过点PP作ll的垂线,垂足为QQ.过点PP作CC的切线,该切线与xx,yy轴分别交于AA,BB两个不同的点.下列说法正确的是A.抛物线CC的标准方程为yy2=2xxB.QQ,BB,FF三点共线当且仅当|PPFF|=4C.当|PPFF|≠1 时,都有PPAA⊥QQFFD.当|PPFF|≠1 时,△PPAAFF恒为等腰三角形三、填空题(本题共3小题,每小题5分,共15分.)12. 在棱长为1的正方体AABBCCAA−AA1BB1CC1AA1中,三棱锥CC−AABB1AA1的体积是_________.13. 从集合{xx|−4≤xx≤2024}中任选2个不同的非零整数作为二次函数ff(xx)=aaxx2+bbxx的系数,则所有满足ff(xx)的顶点在第一象限或第三象限的有序数对(aa,bb)共有_________组.14. 已知向量aa,bb,cc满足aa+bb+cc=00,(aa−bb)⊥(aa−cc),|bb−cc|=3 ,则|aa|+|bb|+|cc|的最大值是_________.四、解答题(本题共5小题,共77分.解答应写出文字说明,证明过程或演算步骤.)15.(13分)已知正方体AABBCCAA−AA1BB1CC1AA1.(1)证明:AAAA1⊥AA1CC;(2)求二面角BB−AA1CC−AA.16.(15分)已知定义在RR上的函数ff(xx)=aaxx4+bbxx3+ccxx2+ddxx(aa≠0).(1)若原点是ff(xx)的一个极值点,证明:ff(xx)的所有零点也是其所有极值点;(2)若ff(xx)的4个零点成公差为2的等差数列,求ff′(xx)的最大零点与最小零点之差.17.(15分)设点SS(1,1)在椭圆CC:xx2aa2+yy2bb2=1(aa>bb>0)内,直线ll:bb2xx2+aa2yy2−aa2bb2=0 .(1)求ll与CC的交点个数;(2)设PP为ll PPSS与CC相交于MM,NN两点.给出下列命题:①存在点PP,使得1|PPPP|,1|PPPP|,1|PPPP|成等差数列;②存在点PP,使得|PPMM|,|PPSS|,|PPNN|成等差数列;③存在点PP,使得|PPMM|,|PPSS|,|PPNN|成等比数列;请从以上三个命题中选择一个,证明该命题为假命题.(若选择多个命题分别作答,则按所做的第一个计分.)18.(17分)2024部分省市的高考数学推行8道单选,3道多选的新题型政策.单选题每题5分,选错不得分,多选题每题完全选对6分,部分选对部分分(此处直接视作3分),不选得0分.现有小李和小周参与一场新高考数学题,小李的试卷正常,而小周的试卷选择题是被打乱的,所以他11题均认为是单选题来做.假设两人选对一个单选题的概率都是14,且已知这四个多选题都只有两个正确答案.(1)记小周选择题最终得分为XX,求EE(XX).(2)假设小李遇到三个多选题时,每个题他只能判断有一个选项是正确的,且小李也只会再选1个选项,假设他选对剩下1个选项的概率是 pp 0�pp 0≥13� ,请你帮小李制定回答4个多选题的策略,使得分最高.19.(17分)信息论之父香农(Shannon )在1948年发表的论文“通信的数学理论”中指出,任何信息都存在冗余,冗余大小与信息中每个符号(数字、字母或单词)的出现概率或者说不确定性有关.香农借鉴了热力学的概念,把信息中排除了冗余后的平均信息量称为“信息熵”,并给出了计算信息熵的数学表达式.设随机变量 XX 所有取值为 1,2,…,nn ,且 PP (xx =ii )=PP ii >0(ii =1,2,…,nn ),PP 1+PP 2+⋯+PP nn =1 ,定义 XX 的信息熵HH (XX )=−�PP ii log 2PP ii nn ii=1(1)当 nn =1 时,求 HH (XX ) 的值;(2)当 nn =2 时,若 PP 1∈�0,12� ,探究 HH (XX ) 与 PP 1 的关系,并说明理由; (3)若 PP 1=PP 2=12nn−1 ,PP kk+1=2PP kk (kk =2,3,⋯,nn ) ,求此时的信息熵 HH (XX ) .2024年新高考改革适应性练习(3)(九省联考题型)数学参考答案一、单项选择题(本题共8小题,每小题5分,共40分.在每小题给出的四个选项中,只有一项是符合题目要求的.)题号 1 2 3 4 5 6 7 8 答案 A B D A D D B C二、多项选择题(本题共3小题,每小题6分,共18分.在每小题给出的选项中,有多项符合题目要求.全部选对的得6分,有选错的得0分,若只有2个正确选项,每选对一个得3分;若只有3个正确选项,每选对一个得2分.具体得分如【附】评分表.)题号91011答案BC ABD BCD【附】评分表三、填空题(本题共3小题,每小题5分,共15分.)题号121314答案132023×2024+4×2024(或 2027×2024)3+3√10四、解答题(本题共5小题,共77分.解答应写出文字说明,证明过程或演算步骤.)15.(13分)以点AA1为坐标原点,AA1BB1���������⃗为xx轴正方向,AA1DD1����������⃗为yy轴正方向,AA1AA�������⃗为zz轴正方向,建立空间直角坐标系OOxxyyzz,并令正方体AABBAADD−AA1BB1AA1DD1的棱长为1.(1)则AA1(0,0,0),AA(1,−1,1),AA1AA�������⃗=(1,−1,1);AA(0,0,1),DD1(0,−1,0),AADD1�������⃗=(0,−1,−1).所以AADD1�������⃗·AA1AA�������⃗=0+1+(−1)=0 ,即AADD1�������⃗⊥AA1AA�������⃗.故AADD1⊥AA1AA得证.(2)BB(1,0,1),AA1BB�������⃗=(1,0,1),由(1)得AA1AA�������⃗=(1,−1,1),设平面AA1BBAA的一个法向量nn11=(xx1,yy1,zz1),则nn11·AA1BB�������⃗=nn11·AA1AA�������⃗=0 ,即�xx1+zz1=0xx1−yy1+zz1=0令xx1=1 ,则�yy1=0zz1=−1,所以nn11=(1,0,−1)是平面AA1BBAA的一个法向量.同理可求得平面AA1AADD的一个法向量nn22=(0,1,1),cos<nn11,nn22>=nn11·nn22|nn11|·|nn22|=−12又 <nn11,nn22>∈(0,ππ),所以 <nn11,nn22>=2ππ3,即平面AA1BBAA与平面AA1AADD的所成角为2ππ3.故二面角BB−AA1AA−DD的大小为2ππ3.16.(15分)(1)ff(xx)=aaxx4+bbxx3+ccxx2+ddxx,ff′(xx)=aaxx3+bbxx2+ccxx+dd,由题意,原点是ff(xx)的一个极值点,即ff′(0)=0 ,代入得dd=0 ,所以ff(xx)=aaxx4+bbxx3+ccxx2=xx2(aaxx2+bbxx+cc),ff′(xx)=aaxx3+bbxx2+ccxx=xx(aaxx2+bbxx+cc),所以ff(xx)和ff′(xx)的零点(0除外)都是方程aaxx2+bbxx+cc=0 的根,即ff(xx)和ff′(xx)有共同零点,故ff(xx)的所有零点也是其所有极值点.(2)设ff(xx)的四个零点分别为mm−3 ,mm−1 ,mm+1 ,mm+3 ,则可以设ff(xx)=kk(xx−mm+3)(xx−mm+1)(xx−mm−1)(xx−mm−3)其中kk≠0 ,令tt=xx−mm,则ff(xx)=kk(tt+3)(tt+1)(tt−1)(tt−3)=kk(tt4−10tt+9)=gg(tt)gg′(tt)=kk(4tt3−20tt)=4kk(tt3−5tt)令gg′(tt)=0 得tt1=−√5 ,tt=0 ,tt=√5 ,所以 ff ′(xx )=0 的所有根为 xx 1=mm −√5 ,xx 2=mm ,xx 3=mm +√5 ,所以 ff ′(xx ) 的最大零点与最小零点之差为 |xx 3−xx 1|=2√5 .17.(15分)(1)因为点 SS (1,1) 在 AA 内,所以 1aa 2+1bb 2<1 ,即 aa 2+bb 2−aa 2bb 2<0 . 联立 ll 与 AA 的方程,得 bb 2(aa 2+bb 2)xx 2−2aa 2bb 4xx +aa 4bb 2(bb 2−1)=0 . 判别式 Δ=4aa 4bb 8−4aa 4bb 4(aa 2+bb 2)(bb 2−1)=4aa 4bb 4(aa 2+bb 2−aa 2bb 2)<0 ,故该二次方程无解,即 ll 与 AA 交点个数为0.(2)可选择命题②或命题③(命题①无法证伪),证明其为假命题. 记点 PP ,MM ,NN 的横坐标分别为 xx PP ,xx MM ,xx NN ,不妨设 PP ,MM ,SS ,NN 顺次排列.选择命题②的证明:当直线 MMNN 的斜率不存在时,MMNN :xx =1 ,分别与 ll ,AA 的方程联立可得 PP �1,bb 2−bb 2aa 2� ,MM �1,bb�1−1aa 2�,NN �1,−bb�1−1aa 2� . 若 |PPMM |,|PPSS |,|PPNN | 依次成等差数列,则 bb�1−1aa 2+�−bb�1−1aa 2�=2 ,显然矛盾,不满足题意.当直线 MMNN 的斜率存在时,设其斜率为 kk ,则 MMNN :yy =kk (xx −1)+1 ,与 ll 的方程联立可得 xx PP =aa 2�bb 2+kk−1�aa 2kk+bb 2;与 AA 的方程联立,得 (aa 2kk 2+bb 2)xx 2−2aa 2kk (kk −1)xx +aa 2[(kk −1)2−bb 2]=0 ,由韦达定理⎩⎨⎧xx MM +xx NN =2aa 2kk (kk −1)aa 2kk 2+bb 2xx MM xx NN =aa 2[(kk −1)2−bb 2]aa 2kk 2+bb 2则 2|PPSS |−(|PPMM |+|PPNN |)=√1+kk 2(2|xx PP −1|−|xx MM −xx PP |−|xx NN −xx PP |) . 不妨设 xx PP >1 ,则 xx PP >xx MM >1>xx NN , 所以原式=�1+kk 2[2(xx PP −1)−(xx PP −xx MM )−(xx PP −xx NN )]=�1+kk 2(xx MM +xx NN −2)=�1+kk 2⋅−2aa 2kk −2bb 2aa 2kk 2+bb 2<0因此 |PPMM |,|PPSS |,|PPNN | 不能成等差数列,从而②是假命题.选择命题③的证明:当直线 MMNN 的斜率不存在时,MMNN :xx =1 ,分别与 ll ,AA 的方程联立可得 PP �1,bb 2−bb 2aa 2� ,MM �1,bb�1−1aa 2�,NN �1,−bb�1−1aa 2�. 若|PPMM |,|PPSS |,|PPNN |成等比数列,则��bb 2−bb 2aa 2�−bb �1−1aa 2�×��bb 2−bb 2aa 2�+bb �1−1aa 2�=��bb 2−bb 2aa2�−1�2即 aa 2+aa 2bb 2−bb 2=0 ,但 aa 2bb 2>aa 2+bb 2 ,因此 aa 2+aa 2bb 2−bb 2>2aa 2>0 ,矛盾,不满足题意.当直线 MMNN 的斜率存在时,设其斜率为 kk ,则 MMNN :yy =kk (xx −1)+1 ,与 ll 的方程联立可得 xx PP =aa 2�bb 2+kk−1�aa 2kk+bb 2;与 AA 的方程联立,得 (aa 2kk 2+bb 2)xx 2−2aa 2kk (kk −1)xx +aa 2[(kk −1)2−bb 2]=0 ,由韦达定理,⎩⎨⎧xx MM +xx NN =2aa 2kk (kk −1)aa 2kk 2+bb 2xx MM xx NN =aa 2[(kk −1)2−bb 2]aa 2kk 2+bb 2则|PPSS |2−|PPMM |⋅|PPNN |=�1+kk 2[(xx PP −1)2−(xx PP −xx MM )(xx PP −xx NN )] =�1+kk 2[(xx MM +xx NN −2)xx PP +1−xx MM xx NN ]=�1+kk 2��2aa 2kk (kk −1)aa 2kk 2+bb 2−1�⋅aa 2(bb 2+kk −1)aa 2kk +bb 2+1−aa 2[(kk −1)2−bb 2]aa 2kk 2+bb 2�=√1+kk 2aa 2kk 2+bb 2(aa 2+bb 2−aa 2bb 2)<0 因此 |PPMM |,|PPSS |,|PPNN | 不能成等比数列,故③是假命题.18.(17分)(1)由题意,对于单选题,小周每个单选题做对的概率为 14 , 对于多选题,小周每个多选题做对的概率为 12,设小周做对单选题的个数为 XX 1 ,做对多选题的个数为 XX 2 , 则XX 1∼BB �8,1�,XX 2∼BB �3,1� ,所以EE(XX1)=8×14=2 ,EE(XX1)=3×12=32,而小周选择题最终得分为XX=5XX1+3XX2,所以EE(XX)=5EE(XX1)+3EE(XX2)=5×2+3×32=292.(2)由题意他能判断一个选项正确,先把这个正确选项选上,如果他不继续选其他选项肯定能得三分,如果他继续选其它选项的话,设此时他的最终得分为XX3,则XX3的所有可能取值为0,6,则XX3的分布列为:XX30 6PP(XX3)1−pp0pp0那么这个题的得分期望是EE(XX3)=0×(1−pp0)+6pp0=6pp0,�pp0≥13�所以我们只需要比较3和 6pp0的大小关系即可,令 6pp0≥3,解得12≤pp0<1 ,此时四个多选题全部选两个选项得分要高,反之,若13≤pp0<12,此时四个多选只选他确定的那个选项得分最高.19.(17分)(1)若nn=1 ,则ii=1 ,PP1=1 ,因此HH(xx)=−(1×log21)=0 .(2)HH(XX)与PP1正相关,理由如下:当nn=2 时,PP1∈�0,12�,HH(xx)=−PP1log2PP1−(1−PP1)log2(1−PP1)令ff(tt)=−tt log2tt−(1−tt)log2(1−tt),其中tt∈�0,12�,则ff′(tt)=−log2tt+log2(1−tt)=log2�1tt−1�>0所以函数ff(tt)在�0,12�上单调递增,所以HH(xx)与PP1正相关.(3)因为PP1=PP2=12nn−1,PP kk+1=2PP kk(kk=2,3,⋯,nn),所以PP kk =PP 2⋅2kk−2=2kk−22nn−1=12nn−kk+1 (kk =2,3,⋯,nn ) 故PP kk log 2PP kk =12nn−kk+1log 212nn−kk+1=−nn −kk +12nn−kk+1而PP 1log 2PP 1=12nn−1log 212nn−1=−nn −12nn−1于是HH (XX )=nn −12nn−1+�PP kk log 2PP kk nnkk=2=nn −12nn−1+nn −12nn−1+nn −22nn−2+⋯+222+12整理得HH (XX )=nn −12nn−1−nn 2nn +nn 2nn +nn −12nn−1+nn −22nn−2+⋯+222+12 令SS nn =12+222+323+⋯+nn −12nn−1+nn2nn 则12SS nn =122+223+324+⋯+nn −12nn +nn 2nn+1 两式相减得12SS nn =12+122+123+⋯+12nn −nn 2nn+1=1−nn +22nn+1 因此 SS nn =2−nn+22nn, 所以 HH (XX )=nn−12nn−1−nn 2nn+SS nn =nn−12nn−1−nn 2nn+2−nn+22nn=2−12nn−2.。
课堂练习题3及参考答案
一、下列语句中标有横线的词项是集合概念还是非集合概念?1.人民,只有人民,才是创造历史的动力。
集合概念2.人民依法享有民主和自由的权利。
非集合概念3.北京人环保意识很强。
集合概念4.北京人是首都的公民,应当维护首都的形象。
非集合概念5.老年人经验丰富,老成持重。
集合概念6.我们的干部来自五湖四海。
集合概念二、下列定义正确吗?为什么?1.生产关系就是人与人之间的社会关系。
不正确,犯有“定义过宽”的错误。
定义项“人与人之间的社会关系”的外延比被定义项“生产关系”的外延大。
2.隐私案件是涉及有隐私内容的案件。
不正确,犯有“同语反复”的错误。
3.天文学就是研究太阳系的科学。
不正确,犯有“定义过窄”的错误。
定义项“研究太阳系的科学”比被定义项“天文学”外延小。
4.“什么是原因?”“原因就是产生结果的现象。
”“那么,什么又是结果?”“结果不就是原因产生的现象吗?”不正确,犯有“循环定义”的错误。
原因与结果这两种现象相互定义。
三、分析下列例子运用了何种探求因果联系的方法?写出其推理形式。
1.因船舶遇难落水,人在水中最多能坚持多久?有人研究发现:会水的人在水温0℃时可坚持15分钟;在水温2.5℃时,是30分钟;在水温5℃时,是1小时;在水温10℃时,是3小时;在水温25℃时,是一昼夜。
可见,人在水中坚持的时间长短与水温高低有因果关系。
( 共变法 )2.加拿大洛文教授为了弄清候鸟迁徙之谜,曾在秋天捕捉了几只候鸟,在入冬之后,将其中的几只置于白昼一天短于一天的自然环境里,将另外的几只置于日光灯照射之下的类似于白昼一天天延长的人工环境里,到了12月间,将两种环境里的候鸟全部放飞,结果发现,日光灯照射的候鸟像春天的候鸟一样向北飞去,而未受日光灯照射的候鸟却留在原地。
据此,洛文教授认为:候鸟迁徙的原因不是气温的升降,而是昼夜的长短。
(求同求异并用法)3.1975年,美国密西根州立大学的里斯本博士做了一个实验,有意外的发现。
小学三年级语文《练习3》教案:阅读练习
注:以下是的文章,如有不合适之处请见谅。
小学三年级语文《练习3》教案是一份非常重要的教案,它涉及到小学三年级学生的语文学习,对于学生学好语文起到了至关重要的作用。
其中,阅读练习是本教案的重点之一,它能够提高学生的阅读理解能力,培养学生的语文素养,是学生学习语文必不可少的环节。
一、教学目标1.掌握阅读理解的基本方法和技能;2.培养学生对语言的敏感度,提高学生的表达能力;3.让学生能够熟练运用基本语言知识,正确运用词语、语言句式等。
二、教学重点1.阅读素材的选取和解读;2.提高学生的阅读理解能力,帮助学生深入理解文本内容;3.培养学生的表达能力,让学生能够准确、流畅地表达想法和观点。
三、教学难点1.帮助学生理解生僻词汇及其在文章中的含义和作用;2.引导学生理解文本在不同语境下的意思。
四、教学方法1.讲授法:教师在课堂上向学生讲述文本的背景、内容、历史、语言和表达的方式;2.启发式教学法:教师通过引导学生思考问题、掌握方法,激发学生的思维和创造力,培养学生的独立思考能力。
五、教学过程1.导入:教师通过引入一些相关的话题,来激发学生的兴趣和注意力,让学生产生一定的猜测和好奇心。
2.讲解文本:教师将文本的主要内容进行概括,同时让学生熟悉生词、短语和难点的理解方法和技能。
3.课堂练习:教师根据文本,选取一些适合的题目进行练习,以检测学生的阅读理解能力和掌握情况。
4.学生自主探究:教师将阅读练习分配给学生自己阅读,让学生在课后完成,鼓励学生发挥自己的独立思考能力。
六、教学评估教师可以通过作业、小测验、课堂练习等形式来进行评估,尤其是对于阅读能力较弱的学生,可以采取一对一的方式,让学生特别关注练习,从而提高学生的阅读能力。
同时,对于文本内容的理解和分析,教师要鼓励学生发表自己的意见和想法,可以采用小组讨论的方式进行,这样可以激发学生的兴趣和思维。
小学三年级语文《练习3》教案中的阅读练习是培养学生语文素养、提高学生阅读理解能力必不可少的环节。
最新人教版三年级数学上册《练习三》优质教学课件
练习题
13.
600
练习题
13.
600
你能提出其他数学问题并解答吗?
例:今天大约还剩多少瓶矿泉水? 把528看成530,184看成180,
530-180=350(瓶) 答:今天大约还剩350瓶矿泉水。(答案不唯一)
课堂总结
150+170=320(个)
练习题
11. 一共有237页,大约还有 (100 )页没读。
143
把237看成240,
把143看成140。
240-140=100(页)
练习题
12.
邮局距电影院多少米? 情况一:邮局、电影院在学校的同侧。
350-280=70(米)
练习题
12.
邮局距电影院多少米? 情况二:邮局、电影院在学校的两侧。
接近460
441 436
452 447
459 458 463
练习题
6.
练习题
7.
北京到沈阳,飞机票 700元,动车票206元。
从北京到沈阳,坐动车比坐飞机大约便宜多少钱?
把206看成200 700-200=500(元) 答:坐动车比坐飞机大约便宜500元。
练习题
8.妈妈有400元,买这两件商品够吗?
把245看成240,
把187看成180。
245>240,187>180,
240+180=420,
245元 187元
245+187一定大于420, 420>400,不够。
Hale Waihona Puke 答:买这两件商 品不够。练习题
9.
640
220
三年级上册练习三
返回 第四页,编辑于星期日:二十三点 六分。
练习三
2.按要求把下面的数填在相应的圈中。
203 195 123 285 308 215 114
接近100
123 114
接近200
203 195 215
接近300
285 308
先分别判断这些数接近几百。
返回 第五页,编辑于星期日:二十三点 六分。
练习三
把每个三位数看作与它接近的整百数 按要求把下面的数填在相应的圈中。
如果邮局和电影院在学校的同侧:
因为只求是否坐得下,不用准确计算,可以估算。
或几百几十数,再进行计算,取整百数 按要求把下面的数填在相应的圈中。
把每个三位数看作与它接近的整百数或几百几十数,再进行计算,取整百数还是几百几十数,要视情况而定。
返回 第十三页,编辑于星期日:二十三点 六分。
练习三
3.冷饮店原有528瓶饮料,今天卖出184瓶,大
约还剩多少瓶?
求“大约”可 以进行估算。
528接近530,184接近180 528-184≈350(瓶)
答:大约还剩350瓶。
返回 第十四页,编辑于星期日:二十三点 六分。
练习三
4.妈妈今天要去超市采购,一个平底锅399元, 一条裙子299元,妈妈带700元够吗?
700-218≈500(元) 答:坐动车比坐飞机大约便宜500元。
返回 第九页,编辑于星期日:二十三点 六分。
练习三
7.体育场里有男生279人,女生196人,现在 有500把椅子,够坐吗?
279<300 196<200
300+200=500 279+196<500
因为只求是否坐 得下,不用准确 计算,可以估算。
《青春期》练习题3
《青春期》练习题3一、单选题1、(单选题) 少男少女性越轨造成怀孕堕胎流产,对男孩的影响更多的是A. 没有影响B. 身体伤害C. 精神、心理伤害D. 身心双重伤害2、(单选题) 少男少女性越轨造成怀孕堕胎流产,对女孩的影响更多的是A. 没有影响B. 身体伤害C. 精神、心理伤害D. 身心双重伤害3、(单选题) “ 事业的辉煌是一阵子,而婚姻家庭的幸福却是一辈子” ,这句话A. 对B. 错C. 说不好D. 不知道4、(单选题) “ 母体生殖健康是妈妈送给未来孩子最珍贵的礼物” ,这句话A. 对B. 错C. 说不好D. 不知道二、多选题5、(多选题) 少男少女性越轨造成怀孕堕胎流产,对女孩未来生育孩子,可造成的危害包括A. 不孕不育B. 死胎C. 畸形D. 残疾6、(多选题) 狭义青春期教育内容包括A. 性安全B. 性健康C. 性卫生D. 生命教育7、(多选题) 青春期是人生成长的关键准备期,主要包括以下哪些准备A. 安身立命B. 谋生创业C. 恋爱、择偶、婚姻D. 生儿育女三、判断题8、(判断题) 一个人一生当中没有任何成功能够弥补婚姻家庭的败局,也没有任何成功能够代替婚姻家庭的成功。
因为事业的辉煌是一阵子,而婚姻家庭的幸福却是一辈子。
9、(判断题) 广义的青春期教育,除了包含性安全、性健康、性卫生外,还包括人生教育、生活教育、生命教育、情感教育、恋前训练和婚前教育。
10、(判断题) 目前的教育体系中,针对事业成功的教育、培训很多,而对如何做成功的夫妻、父母,如何经营幸福的家庭、培育身心健康的孩子方面缺乏专门的教育和训练。
参考答案:一、单选题 1C2D3A4A二、多选题 5ABCD6ABC7ABCD三、判断题8 √ 9 √ 10 √。
大学化学练习题3
大学化学练习题(三)一、选择题1. 下列离子中,离子的磁矩最大的是…………………………………………………………( ) (原子序数:V 23, Cr 24, Mn 25, Ni 28)(A) V 2+ (B) Ni 2+ (C) Cr 3+ (D) Mn 2+2. 按鲍林(Pauling)的原子轨道近似能级图,下列各能级中,能量由低到高排列次序正确的是() (A) 3d , 4s , 5p (B) 5s , 4d , 5p(C) 4f , 5d , 6s , 6p (D) 7s , 7p , 5f , 6d3. 按分子轨道理论,下列分子(离子)中键级等于2的是…………………………………………() (A)-2O (B) CN - (C) Be 2 (D) C 24. 元素周期表中第七周期零族元素的原子序数应是………………………………………( )(A) 104 (B) 118 (C) 150 (D) 1725. 下列各组离子化合物的晶格能变化顺序中,正确的是………………………………( )(A) MgO > CaO > Al 2O 3 (B) LiF > NaCl > KI(C) RbBr < CsI < KCl (D) BaS > BaO > BaCl 26. 下列分子或离子中,几何构型不是正四面体的一组是…………………………………( )(A) SO 42-,ClO 4-,PO 43-(B) SiCl 4,SnCl 4,CCl 4(C) BF 4-,B(OH)4-,BH 4-(D) SF 4,XeF 4,SeF 47. 下列分子中属于非极性分子的是…………………………………………………………( )(A) PH 3 (B) AsH 3 (C) BCl 3 (D) CHCl 38. 在分子中衡量原子吸引成键电子的能力用……………………………………… ( )(A) 电离能 (B) 电子亲和能 (C) 电负性 (D) 解离能9. 以符号4d 表示的电子的主量子数n ,角量子数l 和此轨道最多的空间取向种类分别为…( )(A) 4, 3, 10 (B) 4, 2, 5 (C) 3, 2, 5 (D) 3, 3, 1010. 下列各组分子中,均有极性的一组是………………………………………………()(A) PF3,PF5(B) SF4,SF6(C) PF3,SF4(D) PF5,SF611. 下列各组元素的电负性大小次序正确的是…………………………………………… ()(A) S < N < O < F (B) S < O < N< F(C) Si < Na < Mg < Al (D) Br < H < Zn12. 下列关于-22O和-2O的性质的说法中,不正确的是……………………………………()(A) 两种离子都比O2分子稳定性小(B)-22O的键长比-2O键长短(C)-22O是反磁性的,而-2O是顺磁性的(D)-2O的键能比-22O的键能大13. 下列分子中含有两个不同键长的是………………………………………………… ()(A) CO2(B) SO3(C) SF4(D) XeF414. 测不准原理对于宏观物体的运动无实际意义,其原因是宏观物体……………………()(A) 运动速率大(B) 质量大(C) 位置难以确定(D) 动量难以确定15. 下列离子或化合物中,具有顺磁性的是………………………………………………()(A) Ni(CN)-24(B) CoCl-24(C) Co(NH3)+36(D) Fe(CO)516. 下列各组判断中,不正确的是……………………………………………………………()(A) CH4,CO2,BCl3非极性分子(B) CHCl3,HCl,H2S极性分子(C) CH4,CO2,BCl3,H2S非极性分子(D) CHCl3,HCl极性分子17. 凡是中心原子采用sp 3d 2杂化轨道成键的分子,其空间构型可能是……………………( )(A) 八面体(B) 平面正方形 (C) 四方锥 (D) 以上三种均有可能18. 下列物质中沸点最高的是…………………………………………………………………( )(A )NH 3 (B )PH 3 (C )AsH 3 (D )SbH 319. Li 、Be 、B 原子失去一个电子,所需要的能量相差不是很大, 但最难失去第二个电子的原子估计是 ( )(A) Li (B) Be (C) B (D) 都相同20. 下列分子中的电子为奇数的分子是 …………………………………………………( )(A) F 2O (B) NO 2 (C) CO (D) Cl 2O 721. 下列各组表示核外电子运动状态的量子数中合理的是 ……………………………( )(A) n = 3,l = 3 ,m = 2,m s = 21-(B) n = 2,l = 0 ,m = 1,m s =21(C) n = 1,l = 0 ,m = 0,m s =21(D) n =0,l = 0 ,m = 0,m s =21- 22. [Ni(en)3]2+离子中镍的价态和配位数是 ………………………………………………( )(A) +2,3 (B) +3,6 (C) +2,6 (D) +3,323. 下列分子中,中心原子采取SP 2杂化的是…………………………………………………( )A 、NH 3B 、BF 3C 、CHCl 3D 、H 2O24. 按分子轨道理论,最稳定的顺磁性微粒( )(A )O 2+ (B )O 22+ (C )O 2 (D )O 2-25. 下列哪一种物质处于液态时只需要克服色散力就能使之沸腾……………………………( )(A )CS 2 (B )HF (C )Fe (D )CHCl 326. 下列配合物中,属于螯合物的是……………………………………………………………()(A) [Ni(en)2]Cl2(B) K2[PtCl6](C) (NH4)[Cr(NH3)2(SCN)4] (D) Li[AlH4]27. 核外某电子的角量子数l = 2,它的磁量子数m可能取值有…………………………………()(A) 1个(B) 3个(C) 5个(D) 7个28. 下列各组元素中,电负性依次减小的是………………………………………………………()(A) K > Na > Li (B) O > Cl > H(C) As > P > H (D) 三组都对29. 下列各组原子轨道中不能叠加成键的是……………………………………………………()(A) p x–p x (B) p x–p y(C) s–p x(D) s–p z30. 已知某元素+3价离子的电子排布式为1S22S22P63S23P63d5,该元素在周期表中属于………()(A)ⅤB族(B)ⅢB族(C)Ⅷ族(D)ⅤA族31. 多电子原子的能量E是由()决定的(A)主量子数n (B)n、l (C)n、m、l (D)l32. 在[Ru(NH3)4Br2]+中,Ru的氧化数和配位数分别是……………………………………………()(A) +2和4 (B) +2和6 (C) +3和6 (D) +3和433. 下列各组原子和离子半径变化的顺序,不正确的一组是……………………………………()(A) P3- > S2- > Cl- > F-(B) K+> Ca2+ > Fe2+ > Ni2+(C) Co > Ni > Cu > Zn (D) V > V2+ > V3+ > V4+34. 原子序数为19 的元素的价电子的四个量子数为…………………………………………()(A) n=1,l=0,m=0,m s=+12(B) n=2,l=1,m=0,m s=+12(C) n=3,l=2,m=1,m s=+12(D) n=4,l=0,m=0,m s=+1235. 下列各组元素的电负性大小次序正确的是…………………………………………………()(A) S < N < O < F (B) S < O < N< F(C) Si < Na < Mg < Al (D) Br < H < Zn36. 在下列原子中第一电离能最大的是…………………………………………………………()(A)B (B)C (C)Al (D)Si37. 屏蔽效应起着……………………………………………………………()(A)对核电荷的增强作用(B)对核电荷的抵消作用(C)正负离子间的吸引作用(D)正负离子间电子层的排斥作用38. 某原子2P轨道上有两个电子,描述其中一个电子运动状态的四个量子数是(2,1,0,+½),则描述另一个电子运动状态的四个量子数是………………………………………………()A、(2,1,0,-½)B、(2,1,-1,-½)C、(2,1,1,-½)D、(2,1,1,+½)39. A、B、C为同周期相邻元素,A原子最外层主量子数n = 4,角量子数L=1的轨道为半充满,且电负性A<B<C,则A、B、C为…………………………………………………………()A、As, Se, BrB、N, O, FC、P, S, ClD、Ga, Se, As40. 下列化合物及离子中,中心原子不具有弧电子对的是…………………………………()(A)NH3(B)NH4+(C)H2O (D)OH-41. 在K[Co(NH3)2Cl4]中,Co的氧化数和配位数分别是…………………………………()(A) +2和4 (B) +4和6 (C) +3和6 (D) +3和442.Cu 的原子序数为29,Cu+的电子排布式为………………………………………()(A) [Ar] 3d10(B) [Ar] 3d5(C) [Kr] 4d10(D) [Ar] 3d94s1二、填空题1. 至今没有得到FeI3这种化合物的原因是______________________________________________。
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习题
元集合上只有两种划分, 答:1)2元集合上只有两种划分,因此只有 ) 元集合上只有两种划分 因此只有2 个等价关系, 个等价关系,即B={IA, EA}. = . 2)V的运算表如下. 的运算表如下. ) 的运算表如下 3)V的单位元是 3)V的单位元是EA,零元是IA,可逆元素只 的单位元是EA,零元是IA, 有EA,其逆元是 . ,其逆元是EA. 4)V为半群,独异点,不是群. 为半群, ) 为半群 独异点,不是群.
2
习题
是一个格, 是格中两元素, 设<L,*, ⊙>是一个格,a,b是格中两元素, 是一个格 是格中两元素 证明a*b=a当且仅当 ⊙ b=b. 当且仅当a 证明 当且仅当 .
是布尔代数, 上定义二元运算, 设 < S ,∧,∨ , ,0,1 > 是布尔代数,在S上定义二元运算, 上定义二元运算 有
x ⊕ y = ( x ∧ y) ∨ ( x ∧ y)
能否构成代数系统?如果能, 那么 < S ,⊕ > 能否构成代数系统?如果能,指出是哪 种代数系统. 种代数系统.
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习题
是群, 设<G, *>是群,对任一 ∈G,令H={y| 是群 对任一a∈ , y*a=Байду номын сангаас*y, y ∈G},证明 ,证明<H,*>是G的子群 是 的子群 设S={1,2,4,6,9,12,18,36},D是S上的整 = , 是 上的整 除关系.求证: 除关系.求证: D是一个偏序关系 是一个偏序关系 画出关系D的哈斯图 说明<S, D>是格. 的哈斯图, 是格. 画出关系 的哈斯图,说明 是格 D是分配格么?为什么? 是分配格么?为什么? 是分配格么 求集合{2, 4, 6, 12, 18}的下界,最大下界, 的下界, 求集合 的下界 最大下界, 最小元;上界,最小上界,最大元. 最小元;上界,最小上界,最大元.
习题
1.设<L,≤>为一个格,证明对于任意的 b, 设 , 为一个格, 为一个格 证明对于任意的a, c∈L,有a∧(b∨c)=(a∧b)∨(a∧c)成立, 成立, ∈ , ∧ ∨ ∧ ∨ ∧ 成立 也成立. 则a∨(b∧c)=(a∨b) ∧(a∨c)也成立. ∨ ∧ ∨ ∨ 也成立 2.设A={1,2},B是A上的等价关系的集合. 上的等价关系的集合. 设 , 是 上的等价关系的集合 1.列出 的元素. 的元素. .列出B的元素 2.给出代数系统 的运算表. .给出代数系统V=<B, ∩>的运算表. 的运算表 3.求出 的单位元,零元和所有可逆元素的逆 的单位元, .求出V的单位元 元. 4.说明 是否为半群,独异点和群. 是否为半群, .说明V是否为半群 独异点和群.