答案
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001、五个兄弟,住在⼀起,名字不同,⾼矮不齐。
【谜底】⼿指 002、⼀个⿊孩,从不开⼝,要是开⼝,掉出⾆头。
【谜底】⽠籽 003、⼈脱⾐服,它穿⾐服,⼈脱帽⼦,它戴帽⼦。
【谜底】⾐帽架 004、屋⼦⽅⽅,有门没窗,屋外热烘,屋⾥冰霜。
【谜底】冰箱 005、两只⼩⼝袋,天天随⾝带,要是少⼀只,就把⼈笑坏。
【谜底】袜⼦ 006、弟兄七⼋个,围着柱⼦坐,只要⼀分开,⾐服就扯破。
【谜底】蒜 007、独⽊造⾼楼,没⽡没砖头,⼈在⽔下⾛,⽔在⼈上流。
【谜底】⾬伞 008、⾝穿⼤⽪袄,野草吃个饱,过了严冬天,献出⼀⾝⽑。
【谜底】绵⽺ 009、⼀个⼩姑娘,⽣在⽔中央,⾝穿粉红衫,坐在绿船上。
【谜底】荷花 010、颜⾊⽩如雪,⾝⼦硬如铁,⼀⽇洗三遍,夜晚柜中歇。
【谜底】碗 011、有⾯没有⼝,有脚没有⼿,虽有四只脚,⾃⼰不会⾛。
【谜底】桌⼦ 012、⽩嫩⼩宝宝,洗澡吹泡泡,洗洗⾝体⼩,再洗不见了。
【谜底】⾹皂 013、⾝穿绿⾐裳,肚⾥⽔汪汪,⽣的⼦⼉多,个个⿊脸膛。
【谜底】西⽠ 014、不怕细菌⼩,有它能看到,化验需要它,科研不可少。
【谜底】显微镜 015、象只⼤蝎⼦,抱起似孩⼦,抓挠肚肠⼦,唱出好曲⼦。
【谜底】琵琶 016、是笔不能画,和电是⼀家,要知有⽆电,可去请教它。
【谜底】测电笔 017、圆筒⽩浆糊,早晚挤⼀股,兄弟三⼗⼆,都说有好处。
【谜底】⽛膏 018、上不怕⽔,下不怕⽕;家家厨房,都有⼀个 (打⼀⽣活⽤品)。
【谜底】锅 019、⼀个⽼头,不跑不⾛;请他睡觉,他就摇头 (打⼀物)。
【谜底】不倒翁 020、⼤姐⽤针不⽤线,⼆姐⽤线不⽤针,三姐点灯不⼲活,四姐做活不点灯。
(打四种动物)【谜底】蜜蜂,蜘蛛,萤⽕⾍,纺织娘 021、驼背公公,⼒⼤⽆穷;爱驮什么车⽔马龙(打⼀物)。
【谜底】桥 022、头戴红帽⼦,⾝披五彩⾐,从来不唱戏,喜欢吊嗓⼦(打⼀动物)。
【谜底】公鸡 023、先修⼗字街,在修⽉花台,⾝⼦不⽤动,⼝粮⾃动来(打⼀动物)。
高级营销员习题含参考答案一、单选题(共54题,每题1分,共54分)1.〝存货有限,欲购从速〞、〝三周年店庆,降价三天〞等广告,都是典型的()的实例。
A、保证成交法B、优惠成交法C、从众成交法D、限期成交法正确答案:D2.()是批发商主导的连锁组织得以生存的先决条件。
A、大量采购B、无规则采购C、小规模采购D、批量采购正确答案:A3.中间商决定只经营某一家制造商的产品,这属于()决策。
A、独家配货B、广泛配货C、杂乱配货D、专深配货正确答案:A4.()是选择分销商最关键的因素A、合作意愿B、声誉C、市场D、中间商的历史经验正确答案:C5.超级市场、百货公司、文具店、便利店、服装店等的连锁,都属于()。
A、服务业连锁B、自由加盟连锁C、商业连锁D、饮食业连锁正确答案:C6.在谈判的中期,在掌握节奏方面应基于一个()字A、快B、稳C、实D、慢正确答案:B7.()是一种最简单也最常见的建议成交的方法,也叫直接成交法。
A、请求成交法B、选择成交法C、局部成交法D、假定成交法正确答案:A8.()是指厂商运用变化代理权的形式与内容来激励代理商,从而使代理商更积般地工作。
A、物质激励B、一体化激励C、金钱激励D、代理权激励正确答案:D9.()又称信用限额,也是企业信用政策的一个组成部分。
A、信用条件B、信用额度C、信用标准D、收账政策正确答案:B10.销售人员可以选择那些具有较大购买可能的顾客进行拜访,并可事先对潜在顾客作一番研究,拟定具体的销售方案,因而销售的成功率较高,无效劳动较少,这体现了人员销售()的特点。
A、长远性B、灵活性C、选择性D、完整性正确答案:C11.“先生,如果你现在就签字并采购我的产品,我可以给你特别优待,再降价3%”。
这就是()的实例。
A、保证成交法B、限期成交法C、从众成交法D、优惠成交法正确答案:D12.在整个销售过程中表现消极,对销售人员反应冷淡,这类顾客属于()。
A、虚荣型B、怀疑型C、沉默型D、顽固型正确答案:C13.异地追账不宜采用()。
1.B 2.D 3.时间空间夏江河径流量南北东西4.(1)17升(2)节水与接水谐音,意为节约每一滴用水(3)略(二)1.A 2.D 3.C 4.沉淀过滤蒸馏蒸馏蒸馏水5.过滤铁架台、漏斗、玻璃棒、烧杯、滤纸滤纸破了或滤液高于滤纸边缘(1)没有用玻璃棒引流(2)滤纸边缘高于漏斗边缘(3)漏斗末端没有紧靠烧杯内壁6.(1)B (2)D (3)过滤(4)不是7.(1)结晶(2)过滤8.D 9.B 10.汽化液化复习题1.A 2.D 3.A 4.C 5.D 6.C 7.A 8.B 9.B 1O.D 11.C 12.A 13.D 14.C 15.C 16.(1)海洋水陆地淡水冰川水地下淡水(2)海洋水冰川水17.氧气氢气氢和氧18.增大相等密度19.向上物体排开的液体受到的重力20.增大不变21.2.5×104 22.(1)不饱和(2)升高温度或加水23.(1)溶质溶剂(2)物质溶解能力与温度的关系24.盐水密度增大,马铃薯会上浮而不会下沉,与现象不符合错误大于25.(1)常温下苯甲酸的溶解度很小(2)温度高时苯甲酸溶解得多(3)缓慢冷却到室温26.(1)增大减小(2)等于(3)210.5 27.0.9×103千克/米3 28.59.3毫升960.8克29.(1)p=833千帕因p>p0,所以,该车对路面的压强超过规定值(2)过大的压强损坏路面,且质量过大(车的惯性大),不好操纵,易出交通事故。
30.(1)水面离“0牛”刻度线的距离h与物重G成正比(2)7 (3)10牛第2章地球的“外衣”——大气第1节大气层1.1000 2.(1)①对流层②平流层③中间层④暖层⑤外层(2)①③②④(3)大气具有强烈的对流运动(4)②3.A 4.A 5.D 6.B 7.D 8.(1)略(2)3.6 (3)-8 9.乙杯中的空气会对流第2节天气和气温1.温度湿度2.气温冷热3.温度计摄氏度(℃) 4.普通最高最低一天中的气温是在不断变化的5.(1)午后2时日出前后(2)天气6.D 7.C 8.A 9.(7+15+13+5)÷4=10第3节大气的压强1.大气压2.10.1牛3.流速流速4.C 5.A 6.B 7.A 8.B 9.C 10.C 11.9×104帕12.略第4节大气压与人类生活1.大气压大气压2.大于高于3.零降低4.增大正在沸腾的水停止沸腾减小停止沸腾的水重新沸腾液体的沸点与气压有关,气压增大,沸点升高5.D 6.C 7.C 8.B 9.A 10.A 11.减小大气压增大12.②②③⑤第5节风1.(1)× (2)× (3)√ 2.吹来八3.A-西北风B-北风C-东北风D-东风E-东南风F-南风G-西南风H-西风4.空气流动风级5.B 6.A 7.D 8.A 9.A 10.略第6节为什么会降水1.(1)× (2)× (3)√ (4)√ 2.(1)干湿差:A-2 B-5 C-1 D-3 E-4 F-5 (2)相对湿度:A-71 B-44 C-90 D-74 E-68 F-6l (3)C>D>A>E>F>B 3.D 4.C 5.A 6.B 7.(1)家鸡性喜干燥,雨前鸡笼里特别湿闷,所以它不愿意早进笼去。
英语综合训练一单元C.She graduated from college at a very advanced age.A.pursue a higher degree.D.the link between loudness and hearing loss.D.about half of them listen to music above safe sound levels.B.she is driving to visit her relatives.B.the radiator is too hot.C.the water level is too low in the radiator.A.keep a bottle of water in her car at any time.D.It was a terrible experience in some ways.C.she thinks the man better than her as a tourist.A.the travel agent didn't warn him of the hot weather.D.the foreign food didn't agree with him.D.he was a professor of engineering.A.he invented the refrigerator.C.he clearly knew what he wanted for himself.C.some young Japanese's different lifestyle.D.they are willing to choose short-term,part-time jobsD.people will have no money to support retirement.C.she like she brother was not as englishA.those creative in their workB.She graduated from universities with high standardsC.She actually said nothing to him but thanksD.DeterminationD.. He gives students in using proper techniques for their studyB.more students have chosen to stay in schoolB.write about their past,present and future livesA.the students were all making good progress in their study.C.minority people are not as rich and educated as those in the majority 二单元B.the salaries for-profit private college graduates can earnD.8000D.they are not emotionally ready for collegeC.how to deal with social and life challengesB.he went to train for tennisB.basketball is not his favorite sportsC.he accepted his son’s decision with reasonD.watch his former teammates playA.psychologistC.both men and women have this problemB.something excitingA.by self-questioningC.a possible reason for decision-making stylesD.she gives them responsibilitiesA.they can’t make their own decisionD.he will surely have no points for the examA.students should ask questions and join discussionsC.once a weekA.he didn’t want children because he didn’t think they could bring happinessB.his son is from his wife’s previous marriageA.they had a very bad taste for musicD.he believes he’s being punished as a father missing his son now D.he is sad and disappointed that my son does not show upB.he had to plan his own time for his life and studyD.quite similar socially to living back in chinaB.the number has increased about ten times compared with six years ago D.trying new learning and cultural experiencesA.whether chinese students are experiencing something new is questionable三单元C.he saved the lives of 699 mostly jewish children from the nizis B.through a BBC TV programB.the sufferings of children in warD.the governments will consider using money for warsD.she cannot keep up with the courseA.he tries to be helpful to herC.it wasn’t done as well as expectedD.talk to her professorB.he is open to ideas and picks the one that worksA.to hire a new managerC.untidyB.when he needs to do writingC.everyone should take exercise regularlyB.we think the quality of food is importantA.many of us are willing to pay more for health foodnguageD.they feel they are members of the same groupC.slang comes and goes after trial periodB.it was written by a little girl hiding away during the nizi occupation A.it was caused by the unreasonable opinion of some murderersC.they are like people he feel comfortable with in his lifeB.living every day with hopeB.believing in the goodness of human natureA.war has become more destructive with modern weaponsD.the targets of war have changed form soldiers only to civilian as well D.the sufferings of childrenA.the money was spent at the cost of education servicesC.it can affect the quality of life for many years and generation.四单元C.Progress in bringing a climate agreement into effect.B.To take actions for low carbon development.C.It has suffered the worst election losses.B.The opposition party used Mandela to win trust.A.Planning an overseas tripD.In July.B.Eating outD.Visiting rural Italy.B.To find a summer jobA.He checked some websites.C.It's a bit risky to work thereC.A ski schoolC.Foods that can help to improve health.D.It helps a child's brain developD.Most children had healthy iodine levels.C.His life experiences.B.He could get away from the war.A.He gave lectures around the country.C.we all can develop leadership skills like these peopleA.They share, listen and improve their ideas for a better society D.It makes a difference in achieving group goalsC.people need to work as a team for help and supportA.He should be able to motivate others for a common goal.B.he viewed this offer as special treatment for himD.Uncomfortable.C.a man who cares a lot about his appearanceB.he wanted to challenge the court as a black AfricanD.the supporters were in low spirits and felt hopeless五单元C.Water is linked to creating jobs and conditions of work.D.Unequal water resources.A.A study of Asia's water problems and their causes.D.Human and natural factors.C.His computer is not back as expectedB.a customer service representativeB.there is a delay in their serviceC.to have his computer returned soonA.his future planC.to live comfortably ang freelyD.they will have accent training and cultural learningA.he needs to go and study hardA.teaching to encourage active learningD.by working with and observing kidsB.Direct experience is what students truly needC.People do not experience local culture.D.It allows a free stay to travel around the world.C.He considers meeting friendly people the best part.C.people can do anything to water but destroy itB.drought caused the soil to turn to waves of dustD.the passage of the Clean Water ActB.there was a nationwide movement for water protection B.whether to increase supply or to use water responsiblyD.A drought is taking place as a heat wave hits the vast areas.A.Groundwater levels in northern India fell.D.They have supplied sand for construction projects.A.prioritize the country's water needs in his development plan 六单元C.They are hit by vehicles in streets in surging numberA.Putting up warning signsB.Too much social media use harms children's mental health.D.They can't tell online worlds from the real world.B.they have been working hard.C.to finish reviewingB.it is a new funny movieD.to study the last topic leftB.Friendly.A.By using socialD.For getting to know the other person.A.To be more understanding.A.Learning by playing games.D.It was not fun but painful.B.Goal-driven effort is needed for fun.C.He used natives cruelly for his business.A.A mapmaker used it in memory of an explorer.D.Leif Erikson.D.texting reduced course grade by half a letter on averageA.students using their cellphones could lose one pointC.it works for a short while before most students but not with others B.they had faster heartbeat when unable to answer the phoneA.students are allowed to check their phone every 15 or more minutes D.talking to people and improving social skillsB.Taking risks and having courage to communicateD.Having more time for what to say.A.It is highly personal and scary.C.teens will grow up not knowing how to talk in person。
儿童谜语大全及答案1、俊美无匹却为妖,贵气逼人毒华爪(打一动漫人物)——谜底:杀生丸2、灰溜溜,走到哪跟到哪(打一名词)——谜底:影子3、李大爷的鸽子在张阿婆家下了个蛋,这个蛋属谁的?——谜底:鸽子的4、模样像桶又像帽,花草泥巴来报道。
(打一物)——谜底:花盆5、青枝绿叶颗颗桃,外面骨头里面毛,待到一天桃子老,里面骨头外面毛。
(打一植物)——谜底:棉花6、小强最会撒谎,可为什么他的朋友都说他是诚实的孩子呢?——谜底:都被小强骗的7、脚穿一双特制鞋,尺码大得没了边,冰天雪地向前跑,速度快得像射箭(打一体育运动)——谜底:滑雪8、四四方方一间房,只见有人不见床,一会升来一会降,人来人往上下忙(打一建筑设施)——谜底:电梯9、超市里面最值钱的东西是什么?——谜底:收银机10、兄弟姐妹一般高,放到水里软了腰。
洁白光韧身材好,煮熟尝尝味道妙(打一食品)——谜底:挂面11、天旱(猜一字)——谜底:沙(少水)12、天上无二,合去一口,家家都有,猜一字——谜底:人13、憨憨一小老头,不会跑来不会走。
让他躺下睡,他就猛摇头。
(打一物)——谜底:不倒翁14、五个青铜美男一生围绕着智慧女神转(打一动画片)——谜底:《圣斗士星矢》15、圆圆小铁汉,肚里盛着电,不要随处仍,小心有污染(打一日用品)——谜底:电池16、人送绰号小叮当,微笑大嘴可爱样(打一卡通人物)——谜底:哆啦A梦17、千姊妹,万姊妹,同床睡,各盖被(打一水果)——谜底:石榴18、不能口头推荐淮阴侯探骊格——谜底:应用文·介绍信19、说它像蛇,它不像,头和尾巴都一样,人们用它来健身,跳来跳去乐欢喜——谜底:跳绳20、森林医生很忙碌,爱吃虫子爱敲木(打一动物)——谜底:啄木鸟21、灯笼里面藏棉花,棉花裹着小月牙。
剥开月牙见白豆,灯笼得用竹竿打。
(打一水果)——谜底:柚子22、不用挂蚊帐的王子(打一童话角色)——谜底:青蛙王子23、与其给我飞吻,何若让我依偎在你身旁。
练习题:1.单项选择⑴当砼预制桩的设计间距大于4倍桩直径(或边长)时,宜采用的打桩顺序为( A)。
A.逐排打设B.自中间向四周打设C.自四周向中间打设D.逐排打设⑵摩擦桩型的预制桩在沉桩时,主要质量控制指标是(B)。
A.最后贯入度B.设计标高C.垂直度D.平面位置⑶在周围建筑物密集的狭窄场地施工大直径砼灌注桩,较宜采用(A)。
A.钻孔灌注桩B.沉管灌注桩C.人工挖孔灌注桩D.爆扩灌注桩3.填空题:(1)泥浆护壁钻孔灌注桩成孔施工时,泥浆的作用是:(护壁、携砂、排土、降低钻头温度)。
(2)钢筋砼预制桩的打桩顺序一般有:(逐排打设)、(自中间向四周打设)、(有中间向两边打)。
(3)桩锤重量可按那几个因素来选择:(地质条件)、(工程结构)、(桩的类型)。
密集程度及施工条件(4)预制打入桩垂直度偏差应控制在( 100mm )以内。
(5)入土深度控制对摩擦桩应以(设计标高)为主,以(最后贯入度)作为参考。
端承桩应以(最后贯入度)为主。
(6)钻孔灌注桩钻孔时的泥浆循环工艺有(正循环、反循环)两种,其中(反循环)工艺的泥浆上流速度高,携土能力大。
(7)打入桩施工时,当桩间距(当桩中心距小于等于4倍桩长或桩径时)时,一定要确定合理的打桩顺序。
(2)若按施工方法分,预制桩可划分为(打入法)、(静压法)(8)预制桩吊点设计的原则是:(平稳,避免冲击和振动)。
(9)桩架的作用是(导向)、(固定桩的位置)、(承受桩锤重量)。
(10)预制桩接桩的方法有:(焊接法)、(浆锚法)、(法兰接桩)。
(11)打入桩施工时,宜采用的打桩方法:(重锤低击)。
(12)套管成孔灌注桩施工时,为提高桩的质量,提高桩的承载力,经常采用(复打法施工)。
(13)水下浇筑砼经常采用的方法是(导管法)。
(14)砼预制桩应在砼达到设计强度的(75%)后方可起吊,达到设计强度的100%后方可(运输)和(打设)。
(15)沉管灌注桩施工时,常遇问题有:(断桩)、(缩颈)、(吊脚桩)(砼过量)。
英语课后答案Unit 11.How did Jimmy get his brain damaged?A:He did not get enough oxygen during a difficult delivery,leaving him with brain damage.2. How did the writer describe her father?A:She described her father as a saint,simply held the house together with his patience and understanding.3. How close was the relationship between Jimmy and his father ?A:They were inseparable, almost doing everything together.They ate breakfast together and on weekdays drove off to the navy shipping center every morning where they both worked—Jimmy unloaded color-coded boxes.At night after dinner, they would talk and play games late into the evening.They even whistled the same tunes.4. How much was Jimmy changed after his father’s death?A:He was changed almost completely. He came and lived with me in New York City for a while.He went wherever I went and seemed to adjust pretty well.Still, Jimmy longed to live in my parents' house and work at his old job and I pledged to help him return.5. How did Jimmy get along after he left New York City to live in his parents’ house ?A: He has lived there for 11 years now with many different caretakers and blossomed on his own ,and has become essential to the neighborhood.When you have any mail to be picked up or your dog needs walking, he is your man.6. What did the writer think of her caring for Jimmy?A:She thought that caring for Jimmy has enriched her life more than anything else ever could have.7. Why did the writer invite her friends to Jimmy’s birthday party?A:None of our family could join us because travel was difficult and they were still reckoning with the sheer terror the disaster had brought,so she called on her faithful friends and hoped that their coming would help make the party a merry and festive occasion.8. What did the party remind the writer and her friends of ?A:They were reminded that the constant love and support of friends and family would get them through whatever life might present.Unit 31. What principle does the Hyde School operate on?A:It operates on the principle that if you teach students the merit of such values as truth, courage, integrity, leadership, curiosity and concern, then academic achievement naturally follows.2,What is the Hyde School famous for?A:It has received considerable publicity for its work with troubled youngsters.3. Why was the first Hyde public program suspended within months?A:Because teachers protested the program’s demands and the strain associated with more intense work.4.How is the Hyde curriculum different from conventional schools that provide preparation for college?A:In the Hyde School, all students are required to take performing arts and sports, and provide a community service. For each course, students get a grade for academic achievement and for “best effort”.5.What must parents do for their children to gain admission?A:Parents must agree to accept and demonstrate the school’s philosophies and outlook.6.What is the biggest obstacle for many parents?A:The biggest obstacle for many parents is to realize their own weaknesses.Uint41)What are the five symbols of the United States?A:They are the Statue of Liberty, Barbie dolls, American Gothic, the Buffalo nickel,and Uncle Sam2) Whose face was the Statue of Liberty?A:It was modeled after Bartholdi mothers face.3)Who is the queen of the dolls?A:It is Barbie.4)According to the text, how popular is Barbie?A:Since her introduction in 1959, she has become the universally recognized queen of the dolls. The average American girl owns ten Barbies and two are sold somewhere in the world every second.5)Who painted American Gothic?A:Grant wood.6)What was the Buffalo nickel produced for?A:It honored a pair of connected tragedies from the settlement of the American frontier—the destruction of the buffalo herds and the American Indians.Unit61.What have the scientists done in Japan in order to detect movements? A: They have wired the Earth and sea to detect movements.2. What have the Chinese people traditionally done about earthquakes? A: They have traditionally watched animals and plants for warning signs of earthquakes. For example, the Chinese have noted that before an earthquake, hens' behavior changes—they refuse to enter their cages at night.They have also noticed that snakes come out of the ground to freeze to death and that dogs bark a lot, even normally quiet dogs.3. How are most of the people killed in earthquakes?A: They are killed by falling buildings.4. What do architects so to prevent property damage?A: They design buildings so that the buildings’ columns and horizontal beams are equal are of equal strength, and vertical support columns are inserted deep into solid soil.5. What should people in areas where earthquakes are common do to prepare their houses?A: They should regularly check and reinforce homes, place heavy objects in low positions, attach cupboards and cabinets to walls, and fasten doors so that they will not open accidentally during an earthquake.6. Why are people in these regions suggested to prepare something that can clean water and kill bacteria?A: To make water from other sources safe to drink.7. What is the sensible way to keep all the family members informed of each other in a large earthquake-stricken city?A: To have all of the family members call to check in with a friends or relative who lives more than a hundred miles away. 8. What should be a major emphasis for all government programs and earthquake-related research projects?A: Education concerning how to survive an earthquake should be a major emphasis for all government programs andearthquake-related research projects.Unit 81)When people heard about Dolly, what did they think was within reach?A:People think that a world with human clones was suddenly within reach.2) How did the American government react to cloning?A:President Clinton ordered a national commission to study the legal and moral implication of cloning.3) According to the writer, why are twins more alike than clones? A:Because twins have at least shared the same environment within the mother, are usually raised in the same family, and so forth.4) What are the Dolly researchers unsure of?A:Whether Dolly will be able to give birth to lambs5) Why do some parents want to save their fatally ill child through cloning?A:Because cloning would increase the chances for a tissue match 25 percent to nearly 100 percent.6)Why might pigs be cloned and used as organ donors?A:Because pigs have organs similar in size to humans.But the human body attacks and destroys tissue from other species.7)According to Judith Martin, how should a human clone refer to its DNA donor?A:It might be proper to refer to them as”Most honored sir or madam”.8)What is the gravest concern about human cloning for society?A:The gravest concern isn't really cloning itself, but genetic engineering—the deliberate altering of genes to create human beings according to certain requirements.Specifically, some experts are concerned about the creation of a new (and disrespected) social class: "the clones".Unit101.What did the writer think of Aunt Carrie at the beginning of the story? A: He thought that Aunt Carrie was his favorite relative and favorite authority figure, and she was always free with smiles, words of praise and excuses of misdoings.2.How did the writer feel about the first comparisons between him and John? A:He did not feel good about it, because his first day was disastrous and John's went well.3.How different were john and writer in learning mathematics?A:John advanced quickly in mathematics while the writer was slow.4.What’s the writer’ s attitude towards the comparisons?A:He took them as a challenge although disliked them and began at last to look round for something that I could dowell.When he discovered that he could write well,he worked with intensity at his craft, minding nothing else.Let this be mine, John Bullyer could have all the rest5.What did the writer think about his own stories?A:He thought that his stories were an extension of his own desires to rise above John Bullyer.(The stories that he invented were mostly technological and science fiction in nature.They told of rockets and spacecraft, things that would take men high up into the sky.After some analysis of my personality, he realized that my stories were an extension of his own desires to rise to higher and higher altitudes, until he was above John Bullyer)6.How did the writer learn about john in the later year?A:He learned about John mainly through newspapers.7.How did john and the writer think of each other before they meet in a club?A:They both thought that the other was taller, smarter, and more handsome.8.How did the writer and john finally feel about their life competition? A: Both of them were finally positive about their life competition, because they both felt grateful to their aunt.。
图像法解题——动力学部分
力和运动的关系:
1.在粗糙的水平面上,物体在水平推力作用下,由静止开始作匀加速直线运动,作用一段时间后,将水平力逐渐减小为零,则在水平推力逐渐减小的过程中 ( D )
A .速度逐渐减小,加速度大小逐渐减小
B .速度逐渐增大,加速度大小逐渐减小
C .速度先增大后减小,加速度的大小先增大后减小
D .速度先增大后减小,加速度的大小先减小后增大
2.一物体在几个力的共同作用下处于静止状态.现使其中向东的一个力F 的值逐渐减小到零,又马上使其恢复到原值(方向不变),则 ( A )
A .物体始终向西运动
B .物体先向西运动后向东运动
C .物体的加速度先增大后减小
D .物体的速度一直增大
解析:注意是马上回复原值。
3.如图,放在光滑水平面上的木块受到两个水平力F 1与F 2的作用,静止不动,现保持力F 1不变,使力F 2逐渐减小到零,再逐渐恢复到原来的大小,过程中正确的图像是( B )
4.做直线运动的物体,若其所受合力F 方向不变,而大小逐渐减小到零,则物体可能 (ABCD)
A .速度不断减小,达到零后又反向运动,速度又越来越大,最后趋于稳定
B .速度不断减小,到加速度减小到零时运动停止
C .速度不断减小,到加速度减小为零时速度达到最小,而后做匀速直线运动
D .速度不断增大,到加速度减小到零时速度达到最大,而后做匀速直线运动
解析:【1】由已知得出原来可能匀加D ⇒;
可能匀减⎪⎩
⎪⎨⎧A 0F B v F C 00F ,则减小到减小到某值时,当恰好也减小到零,则减小到零时,
当,则还没减小到时,减小到当v v , 【2】V- t 图像:
5.做匀速直线运动的物体从某时刻起受到一恒力作用。
此后质点的动能可能 ( ABD )
A .一直增大
B .先逐渐减小至零,再逐渐增大
C .先逐渐增大至某一最大值,再逐渐减小
D .先逐渐减小至某一非零的最小值,再逐渐增大
解析:当初速度和恒力同向时A 正确,反向时,B 正确,夹角大于900时,D 正确。
图像法解题:
1.如图,光滑水平面上放有两个质量相等的物块,物块A 连接一个轻弹簧并处于静止状态,物块B 以v 0向着物块A 运动,相互作用的过程中,正确的图象是 ( BCD )
解析:根据动量守恒中碰撞:质量相同,速度交换,得出实线一定恰好与横轴相切,A物体速度恰为v0,弹簧回复原长。
根据动量守恒,速度相等时速度为v0/2。
因为弹簧是先是压缩形变阶段,后恢复形变阶段,因此A先做加速度增加的加速运动,后做加速度减小的加速运动,B则是先做加速度增加的减速运动,后做加速度减小的减速运动。
C:机械能守恒,速度相等时,弹性势能最大,动能最小,两物块动能之和小于初动能。
2.如图所示,质量相同的木块A,B用轻质弹簧连接静止在光滑的水平面上,弹簧处于自然状态.现用水平恒力F推A,则两物块从开始到弹簧第一次被压缩到最短的过程中( BD ) A.v相同时,a A=a B
B.v相同时,a A<a B
C.a相同时,v A<v B
D.a相同时,v A>v B
解析:作出A、B两物体的速度图象如图:
加速度相等之前A加速度和速度均一直大于B的;
当加速度相同时,A速度大于B,所以弹簧型变量继续增大,A加速度继续减小,B继续增大,所以存在速度相等;
当速度相等时,由于加速度不同,即速度变化快慢不同(A<B)所以不能以共同的加速度做匀加速!
3.(09江苏)如图,两质量相等的物块A、B通过一轻质弹簧连接,B足够长、放置在水平面上,所有接触面均光滑。
弹簧开始时处于原长,运动过程中始终处在弹性限度内。
在物块A上施加一个水平恒力,A、B从静止开始运动到第一次速度相等的过程中(BCD )
A.当A、B加速度相等时,系统的机械能最大
B.当A、B加速度相等时,A、B的速度差最大
C.当A、B的速度相等时,A的速度达到最大
D.当A、B的速度相等时,弹簧的弹性势能最大
解析:处理本题的关键是对物体进行受力分析和运动过程分析,使用图象处理则可以使问题大大简化。
对A 、B 在水平方向受力分析如图,F 1为弹簧的拉力;当加速度大小相同为a 时,对A有ma F F =-1,对B有ma F =1,得2
1F F =,在整个过程中A的合力(加速度)一直减小而B的合力(加速度)一直增大,在达到共同加速度之前A 的合力(加速度)一直大于B的合力(加速度),之后A 的合力(加速度)一直小于B的合力(加速度)。
两物体运动的v-t 图象如图,t l 时刻,两物体加速度相等,斜率相同,速度差最大,t 2时刻两物体的速度相等,A速度达到最大值,两实线之间围成的面积有最大值即两物体的相对位移最大,弹簧被拉到最长;除重力和弹簧弹力外其它力对系统正功,系统机械能增加,t l 时刻之后拉力依然做正功,即加速度相等时,系统机械能并非最大值。
4.一颗速度较大的子弹,水平击穿原来静止在光滑水平面上的木块,设子弹对木块的阻力恒定,则当子弹入射速度增大时,下列说法正确的是( BD )
A .木块获得的动能变大
B .木块获得的动能变小
C .子弹穿过木块的时间变长
D .子弹穿过木块的时间变短
v
解析:
v 子弹以初速度v o 穿透木块过程中,子弹、木块在水平方向均受恒力作用,子弹匀减速运动,木块匀加速运动.因此,可定性作出穿透过程中木块、子弹的v-t 图像如图中实线A 、B 所示,图中OA 、v o B 分别为穿透过程中,木块、子弹的速度图像,图中梯形OABv o 的面积为子弹相对木块的位移,即木块的长度.当子弹入射速度增大为v o /时,穿透过程中二者的相对位移(梯形OA /B / v o /的面积)仍是木块长度,即梯形OA /B / v o /的面积与梯形OABv o 的面积相等,所以木块、子弹的速度图像将如图中的OA / 、v o /B /所示.显然,由图像可以
看出,当子弹的速度变大时,木块获得的速度变小,即获得的动能变小;子弹穿过木块的时间变短.
5.如图甲,一轻弹簧的两端与质量分别为m1和m2和两木块A、B相连静止在光滑水平面上。
现使A瞬时获得水平向右的速度v=3m/s,以此时刻为计时起点,两木块的速度随时间变化规律如图乙,则( BC )
时刻弹簧最短,t3时刻弹簧最长
A.t
B.从t1时刻到t2时刻弹簧由伸长状态恢复到原长
C.两物体的质量之比为m1:m2=1:2
D.在t2时刻两物体动能之比为E k1:E k2=1:4。