16山西大同大学期末考试参考答案及评分标准
2022年山西大同大学网络工程专业《计算机网络》科目期末试卷A(有答案)
2022年山西大同大学网络工程专业《计算机网络》科目期末试卷A(有答案)一、选择题1、计算机网络从逻辑功能上可分为()。
I.资源子网Ⅱ.局域网 III.通信子网 IV.广域网A.II、IVB.I、ⅢC.I、IVD. Ⅲ、IV2、一般来说,学校的网络按照空间分类属于()。
A.多机系统B.局域网C.城域网D.广域网3、下列关于拥塞控制策略的描述中,()符合开环控制。
A.在拥塞已经发生或即将发生时做出反应,调节交通流B.根据用户的协议限制进入网络的交通,从而阻止拥塞的发生C.需要实时将网络的状态反馈到调节交通的地点(通常是源)D.不需要预留某些资源,资源的使用率很高4、关于路山器,下列说法中正确的是()。
A.路由器处理的信息量比交换机少,因而转发速度比交换机快B.对于同一目标,路由器只提供延迟最小的最佳路由C.通常的路由器可以支持多种网络层协议,并提供不同协议之间的分组转换D.路由器不但能够根据IP地址进行转发,而且可以根据物理地址进行转发5、在下列多路复用技术中,()具有动态分配时隙的功能。
A.同步时分多路复用B.码分多路复用C.统计时分多路复用D.频分多路复用6、全双工以太网传输技术的特点是()。
I.能同时发送和接收帧II.不受CSMA/CD限制III.不能同时发送和接收IV.受CSMA/CD限制A.I,IIB. I,IVC.II,IIID.III,IV7、下列关于UDP协议的叙述中,正确的是()。
I.提供无连接服务Ⅱ.提供复用/分用服务Ⅲ.通过差错校验,保障可靠数据传输A.仅IB.仅I、ⅡC.仅Ⅱ、ⅢD. I、Ⅱ、IⅢ8、主机甲与主机乙之间已建立一个TCP连接,双方持续有数据传输,且数据无差错与丢失。
若甲收到1个来自乙的TCP段,该段的序号为1913,确认序号为2046,有效载荷为100B,则甲立即发送给乙的TCP段的序号和确认序号分别是()。
A.2046,2012B.2046,2013C.2047,2012D.2047,20139、假设拥塞窗口为20KB,接收窗口为30KB,TCP能够发送的最大字节数是()。
机电一体化系统设计基础(专升本)
山西大同大学山西大同大学继续教育学院2019级函授专业学生2019年期末考试批次专业:201901-机械设计制造及自动化(函授)(专升本)课程:机电一体化系统设计基础(专升本)总时长:120分钟1. (单选题) 光栅传感器的莫尔条纹明暗变化一个周期,说明光栅移动了()。
(本题4.0分)A、3/4栅距B、1/2栅距C、1/4栅距D、一个栅距学生答案: D标准答案:D解析:得分: 42. (单选题) 步进电机的最大动态转距()最大静转距,随脉冲频率的升高而降低。
(本题4.0分)A、大于B、小于C、等于D、大于或小于学生答案: B标准答案:B解析:得分: 43. (单选题) 机电一体化系统中,采用光电耦合器的最主要的作用是()。
(本题4.0分)A、传送信息时放大功率B、传送信息时转换功率C、防止外界干扰进入计算机D、数字脉冲转换学生答案: C标准答案:C解析:得分: 44. (单选题) D/A转换器输出有()两种方式。
(本题4.0分)A、电流和信号B、电流和电压C、电压和信号D、数字信号和模拟信号学生答案:未答题标准答案:B解析:得分: 05. (单选题) 机电一体化产品中的机械系统包括()三部分。
(本题4.0分)A、传动机构、检测机构、导向支承机构B、检测机构、导向支承机构、执行机构C、检测机构、传动机构、执行机构D、执行机构、导向支承机构、传动机构学生答案: D标准答案:D解析:得分: 46. (单选题) 直流伺服电机按定子磁场产生方式可分为()。
(本题4.0分)A、永磁式和他励式B、永磁式和可变磁阻式C、他励式和混合式D、可变磁阻式和混合式学生答案: A标准答案:A解析:得分: 47. (单选题) 机电一体化机械进给系统采用齿轮传动副时,应该有消隙措施,其消除的是()。
(本题4.0分)A、齿轮轴向间隙B、齿顶间隙C、齿侧间隙D、齿根间隙学生答案: A标准答案:A解析:得分: 48. (单选题) 对于升速的齿轮系,()。
工程数学(专升本)
山西大同大学山西大同大学继续教育学院2019级函授专业学生2019年期末考试批次专业:201901-机械设计制造及自动化(函授)(专升本)课程:工程数学(专升本)总时长:120分钟1. (单选题) 若阶方阵可以对角化,则( )(本题4.0分)A、B、一定有个互异的特征值C、一定是对角阵D、一定有个线性无关的特征向量学生答案: D标准答案:D解析:得分: 42. (单选题) 向量组,,,的秩是( )(本题4.0分)A、 1B、 2C、 3D、 4学生答案: B标准答案:C解析:得分: 03. (单选题) 矩阵的行最简形矩阵是( )(本题4.0分)A、B、C、D、学生答案: B标准答案:C解析:得分: 04. (单选题) 设,均为可逆方阵,,则下列选项错误的是( )(本题4.0分)A、B、C、D、学生答案: C标准答案:C解析:得分: 45. (单选题) 设和为阶矩阵,,则以下选项中正确的是( )(本题4.0分)A、B、C、D、学生答案: B标准答案:D解析:得分: 06. (单选题) ()(本题4.0分)A、B、C、D、学生答案: B标准答案:B解析:得分: 47. (单选题) 设,为阶矩阵,,则以下选项中正确的是( )(本题4.0分)A、B、C、D、学生答案: B标准答案:D解析:得分: 08. (单选题) 设,均为可逆方阵,,则下列选项错误的是( )(本题4.0分)A、B、C、D、学生答案: C标准答案:C解析:得分: 49. (单选题) 设有矩阵,则下列运算成立的是( )(本题4.0分)A、B、C、D、学生答案: C标准答案:C解析:得分: 410. (单选题) 设矩阵是阶方阵的伴随矩阵,为单位矩阵,下列结论不正确的是( )(本题4.0分)A、B、C、D、学生答案: C标准答案:D解析:得分: 011. (单选题) 设都是阶可逆方阵,为单位矩阵,且,则=( )(本题4.0分)A、B、C、D、学生答案: B标准答案:B解析:得分: 412. (单选题) 下列各4级排列中,为偶排列的是( )(本题4.0分)B、1324C、2341D、3412学生答案: D标准答案:D解析:得分: 413. (单选题) 设向量组,则下列说法错误的是( )(本题4.0分)A、若中有一个是零向量,则向量组线性相关B、若线性无关,则任意向量都不能由其余向量线性表示C、若可以由线性表示,则表示式必不唯一D、零向量必可以由线性表示学生答案: B标准答案:C解析:得分: 014. (单选题) 已知,则( )(本题4.0分)B、C、或D、或学生答案: D标准答案:D解析:得分: 415. (单选题) 设是非齐次线性方程组的两个不同的解,是相应的齐次线性方程组的基础解系,则的通解为( )(本题4.0分)A、B、C、D、学生答案: B标准答案:B解析:得分: 416. (判断题)(本题4.0分)A、trueB、false学生答案: A标准答案:B解析:得分: 017. (判断题)(本题4.0分)A、trueB、false学生答案: B标准答案:B解析:得分: 418. (判断题)(本题4.0分)A、trueB、false学生答案: A标准答案:B解析:得分: 019. (判断题) (本题4.0分)A、trueB、false学生答案: B标准答案:B解析:得分: 420. (判断题)(本题4.0分)A、trueB、false学生答案: B标准答案:A解析:得分: 021. (判断题)(本题4.0分)A、trueB、false学生答案: A标准答案:B解析:得分: 022. (判断题) (本题4.0分)B、false学生答案: B标准答案:A解析:得分: 023. (判断题)(本题4.0分)A、trueB、false学生答案: A标准答案:A解析:得分: 424. (判断题)(本题4.0分)B、false学生答案: B标准答案:B解析:得分: 425. (判断题) (本题4.0分)A、trueB、false学生答案: A标准答案:A解析:得分: 4返回帮助。
2021年山西大同大学浑源师范分校高三英语期末考试试题及答案解析
2021年山西大同大学浑源师范分校高三英语期末考试试题及答案解析第一部分阅读(共两节,满分40分)第一节(共15小题;每小题2分,满分30分)阅读下列短文,从每题所给的A、B、C、D四个选项中选出最佳选项AThank you. It’s my great honor to be given this award.You cannot imagine that I have always been a late starter. Years ago, when I was 16, I took an important exam — GCE(General Certificate of Education), which turned out to be a failure. My dad was reading my report card and saw that my position in class was 29th, but the number in class was 29. It meant that I had achieved the distinction of being bottom of my class.I wasn’t lazy, and I was really trying. You can picture how I felt. Dad put his hand on my shoulder and said, “You can only do the best you can, but whatever you decide to do, make sure you love it.” He was a really sweet guy and a great man. I knew his attempt to hide his disappointment with some of his encouraging words. I was depressed for a week, but his advice was a wake-up call.Fortunately I love working with my hands, and I was good at two things: woodwork and art, and I really loved to draw and paint. I was quite talented. Dad strongly encouraged me to go to art school, which in those days wasn’t the obvious place that a father would suggest.So I got into Hartlepool College of Art. The college was a revelation (出乎意料), the passionate teachers there, who were extremely interested in the students, not just tolerating them but actually engaging with them. It was a world apart from my schooling until then. It’s extraordinary what an enthusiastic teacher can do, drawing the student out, lighting independence, and encouraging a design of your own future, rather than waiting for something to happen. I’m honored to have become one of these passionate teachers years later.My teachers inspired me, and thanks to my dad, here I am tonight. I think I should mention all the talents I have worked with over time, and to my kids and my wife Giannina, thank you.Thank you for this great award. I shall find a very special place for it.1. How did the author feel after taking GCE?A. Happy.B. Upset.C. Tired.D. Relieved.2. What didHartlepoolCollege of Art impress the author most?A. The teachers were strict with students.B. The students set good examples for each other.C. The teachers inspired students’ passion for learning.D. The students got prepared for their lessons independently.3. The author gave this speech to ________.A. share his career choiceB. explain his teaching methodsC. describe his life experienceD. show his appreciationBMy first week working in a restaurant, one of the servers said something that stuck with me: Everyone should work in a restaurant for at least a year. At the time, I didn't get it, but I took the advice to heart and worked in restaurants on and off for the next eight years. Before realizing it, I mastered many important skills, one of which is communication skill.When I was little, I was so shy that I used to hide behind my mom whenever someone spoke to me. And when I first started in restaurants, I had two personalities: Restaurant Lizzy and Home Lizzy. It was easier to pretend to be a different person while at work, since it was so different from who I actually was. But gradually, the skills I learned working in restaurants helped Home Lizzy come out of her shell in the real world.When you work in a restaurant, you don't have the luxury of hiding behind your parents to avoid talking to people. I'm still 110% an introvert, but restaurant work helped me communicate. Working in a restaurant not only helped me speak clearly, deliberately and directly but also taught me how to talk about almost everything. Some guests don't want their servers to interact too much with them, and that's fine. But some sit at the bar simply to chat with you. You learn how to judge your guests' level of interest in communicating with you, and how to exit a conversation at the appropriate time.My restaurant work is something that I'm most proud of and I know I wouldn't be the person I am today without those eight years of experience. If you're still on the fence about working in a restaurant for that long, start with one year. I doubt that you'll look back.4. What did the writer think of the server's words?A. Impressive.B. Ridiculous.C. Amusing.D. Logical.5. What do we infer from Paragraph 2?A. The writer tried different jobs.B. The writer became more sociable.C. The writer used an invented name.D. The writer had a hard time at work.6. Which of the following best describes the writer's restaurant work?A. Boring.B. Relaxing.C. Worthwhile.D. Unchallenging.7. What message does the writer try to convey in this passage?A. A strong-willed soul can reach his goal.B. Things are difficult before they are easy.C. Communication skills advance your career.D. Restaurantwork helps to achieve a better self.CYou don't generally expect to put yourself in the public eye whenyou go on vacation. However when a British couple, Jessica and Edward, flew to Crete, they found themselves attracting a lot of attention after coming across a large sum of money in the street.At first, their Crete vacation hadn't been anything outside of the norm. However, it was as they were exploring the souvenir shops that everything changed. The couple were just walking down the street when Jessica suddenly kicked something lying on the ground. It looked a bit like a make-up bag and so they assumed that someone had lost it.Without hesitation, Jessica picked up the bag and opened it. She was shocked to see a lot of money in it-a total of 7,100 Euros. There was probably a lot they could do with all that money. However, the couple didn't have it in them to steal what belonged to someone else. Going to the police was the first thought that came to mind when Jessica saw the money. She didn't consider that there was any other choice, so the couple handed over the money to the local police.The police found the owner, an elderly woman, and informed the couple that the woman wanted to meet them. When they eventually met at the police station, the woman was so overcome with emotion that she wouldn't stop hugging and blessing them, although they insisted they were just doing the right thing.News of what the couple had done quickly made its way around the island. The locals wanted to show them their gratitude. This included receiving free taxi rides and even an offer to have their hotel room upgraded. The couple appreciated the kindness, but it was all getting to be a bit too much. They just wanted to have a normal vacation.They are probably hoping that they fly a little more under the radar during their next vacation. There's only so much attention that these two lovebirds can handle.8. What is the first reaction of the couple after finding the money?A. They decided to do all with that money.B. They bought something in souvenir shops.C. They turned it over to the local police station.D. They tried to look for the owner by themselves.9. Which o£ the following can best describe the locals in Crete?A. Polite and hard-working.B. Kind and grateful.C. Sociable and honest.D. Rich and determined.10. Why do the couple hope to “fly a little more under the radar" in the last paragraph?A. They want to take fewer flights.B. They can't handle more radars.C. They hope to gain less attention.D. They don't have more money.11. What can we learn from the text?A. Good things come to kind people.B. The early bird catchesthe worm.C. Behind bad luck conies good luck.D. Money is too much for strangers.DSleep problems in early childhood may be linked to the development of certain mental health disorders in adolescence, according to a new research.A study of 7,155 children in theUnited Kingdomfound that waking up frequently during the night and irregular sleep routines as babies and toddlers was linked to psychotic experiences in children aged 12 and 13. Also, children who slept for shorter periods at night were more likely to be associated with borderline personality disorder at ages 11 and 12.The research, published in the journalJAMA Psychiatry, was the first time possible links between early childhood sleep problems and adolescent psychotic experiences and borderline personality disorder (BPD) symptoms have been examined.“We know from previous research that persistent nightmares in children have been associated with both psychosis and borderline personality disorder,” said lead author Isabel at theInstituteofMental Healthat theUniversityofBirmingham.“But nightmares don’t tell the whole story. We’ve found that, in fact, a number of behavioral sleep problems in childhood can point towards these problems in adolescence,” she said.Adolescence, typically defined as the ages between 10 and 19, is a key period in human development because of brain and hormonal changes, anditis now thought to be when many mental health problems start.Prior research inAustraliafound that babies with persistent severe sleep problems in their first year were at greater risk for anxiety and emotional issues in later childhood. Sleep problems in children and adolescents have been shown to predict the development of various emotional and behavioral problems, including depression, anxiety, attention-deficit hyperactivity disorder, risk-taking and aggression. However, findings have been inconsistent, especially when based on objective measurements of sleep, rather than parental reports.Sleep and mental health are closely connected in adults, with sleep problems increasing the risk for developing particular mental illnesses as well as resulting in mental health issues.12. What can we know from paragraph 3?A. Childhood sleep problems probably cause youth mental health problems.B. Severe sleep problems in childhood lead to emotional issues.C. Persistent nightmares in children are closely related to psychosis.D. The research has not been known to the public.13. What does “it” refer to in paragraph 6?A. Adolescence.B. Key period.C. Human developmentD. Hormonal change.14. According to the Australian research, older children who had long-term serious sleep issues at one year old are more likely to ________.A. grow slowlyB. develop attention-deficit hyperactivity disorderC. do badly in lessonsD. suffer from anxiety15. Which of the following can be the best title for the text?A. A Study About Childhood Sleep Problems Is Under ProgressB. Pay Attention to Children Who Lack SleepC. Childhood Sleep Issues Linked to Adolescent Mental Health ProblemsD. How to Help Children Develop a Good Sleep Habit第二节(共5小题;每小题2分,满分10分)阅读下面短文,从短文后的选项中选出可以填入空白处的最佳选项。
2022年山西大同大学计算机科学与技术专业《数据结构与算法》科目期末试卷A(有答案)
2022年山西大同大学计算机科学与技术专业《数据结构与算法》科目期末试卷A(有答案)一、选择题1、下列说法不正确的是()。
A.图的遍历是从给定的源点出发每个顶点仅被访问一次B.遍历的基本方法有两种:深度遍历和广度遍历C.图的深度遍历不适用于有向图D.图的深度遍历是一个递归过程2、用有向无环图描述表达式(A+B)*((A+B)//A),至少需要顶点的数目为()。
A.5B.6C.8D.93、某线性表中最常用的操作是在最后一个元素之后插入一个元素和删除第一个元素,则采用()存储方式最节省运算时间。
A.单链表B.仅有头指针的单循环链表C.双链表D.仅有尾指针的单循环链表4、已知有向图G=(V,E),其中V={V1,V2,V3,V4,V5,V6,V7}, E={<V1,V2>,<V1,V3>,<V1,V4>,<V2,V5>,<V3,V5>, <V3,V6>,<V4,V6>,<V5,V7>,<V6,V7>},G的拓扑序列是()。
A.V1,V3,V4,V6,V2,V5,V7B.V1,V3,V2,V6,V4,V5,V7C.V1,V3,V5,V2,V6,V7D.V1,V2,V5,V3,V4,V6,V75、最大容量为n的循环队列,队尾指针是rear,队头:front,则队空的条件是()。
A.(rear+1)MOD n=frontB.rear=frontC.rear+1=frontD.(rear-1)MOD n=front6、下列选项中,不能构成折半查找中关键字比较序列的是()。
A.500,200,450,180 B.500,450,200,180C.180,500,200,450 D.180,200,500,4507、下列关于无向连通图特性的叙述中,正确的是()。
Ⅰ.所有的顶点的度之和为偶数Ⅱ.边数大于顶点个数减1 Ⅲ.至少有一个顶点的度为1A.只有Ⅰ B.只有Ⅱ C.Ⅰ和Ⅱ D.Ⅰ和Ⅲ8、一棵哈夫曼树共有215个结点,对其进行哈夫曼编码,共能得到()个不同的码字。
山西省大同市十六中学2021年高二化学上学期期末试卷含解析
山西省大同市十六中学2021年高二化学上学期期末试卷含解析一、单选题(本大题共15个小题,每小题4分。
在每小题给出的四个选项中,只有一项符合题目要求,共60分。
)1. 一定温度下,反应N2(g)+3H2(g)2NH3(g)的反应热和化学平衡常数分别为△H和K, 则相同温度时反应4NH3(g) 2N2(g)+6H2(g)的反应热和化学平衡常数为 A.2△H和2K B.-2△H和 K2C.-2△H和 K-2 D.2△H和-2K参考答案:C反应热和化学计量数成之比,即反应热是-2△H;平衡常数是在一定条件下,可逆反应达到平衡状态时,生成物浓度的幂之积和反应物浓度的幂之积的比值,所以根据方程式可知,选项C正确,选C。
2. 下列说法中正确的是A.1s电子云呈球形,表示电子绕原子核做圆周运动B.电子云图中的小黑点密度大,说明该原子核外空间电子数目多C.n s能级的原子轨道图可表示为D.3d3表示3d能级有3个轨道参考答案:C略3. 下列分子中心原子是sp杂化的是A.CH2=CH2 B.CH4 C.C6H6 D.CH CH 参考答案:D略4. 关于苯的下列说法正确的是()A.苯是1825年由俄国科学家门捷列夫发现的B.苯与乙烯一样,是很重要的化工原料,可作消毒剂、有机溶剂、洗涤剂C.苯的分子式中碳原子远没有饱和,因此能使溴水和高锰酸钾褪色D.苯环上的碳碳键是一种介于单键和双键的独特的键,苯既能发生取代反应也能发生加成反应参考答案:D考点:苯的结构;苯的性质.专题:有机物的化学性质及推断.分析:A.1825年,迈克尔?法拉第(Michael Faraday)发现的;B.苯有毒;C.苯中不含碳碳双键;D.苯环上的碳碳键是一种介于单键和双键的独特的键.解答:解:A.苯是1825年迈克尔?法拉第(Michael Faraday)发现的,故A错误;B.苯是一种有毒的物质,不能做消毒剂和洗涤剂,故B错误;C.苯中不含碳碳双键,不能使溴水和高锰酸钾褪色,故C错误;D.苯环上的碳碳键是一种介于单键和双键的独特的键,苯既能发生取代反应也能发生加成反应,故D 正确;故选:D.点评:本题考查了苯的结构和性质,题目难度不大,明确苯中碳碳键的独特性是解题关键5. 金属镍有广泛的用途。
山西省大同市十六中学2022年高一数学理上学期期末试卷含解析
山西省大同市十六中学2022年高一数学理上学期期末试卷含解析一、选择题:本大题共10小题,每小题5分,共50分。
在每小题给出的四个选项中,只有是一个符合题目要求的1. 如果集合U={1,2,3,4,5,6,7,8},A={2,5,8},B={1,3,5,7},那么(C U A)∩B等于( )A. {4}B. {1,3,4,5,6,7,8}C. {1,3,7}D. {2,8}参考答案:C2. 球O与棱长为a的正方体ABCD﹣A1B1C1D1的各个面均相切,如图,用平平行于底面的平面截去长方体A2B2C2D2﹣A1B1C1D1,得到截面A2B2C2D2,且A2A=a,现随机向截面A2B2C2D2上撒一粒黄豆,则黄豆落在截面中的圆内的概率为()A.B.C.D.参考答案:B【考点】几何概型.【分析】求出截面中的圆的半径为=,面积为,截面A2B2C2D2的面积为a2,利用面积比可求概率.【解答】解:由题意,截面中的圆的半径为=,面积为,∵截面A2B2C2D2的面积为a2,∴黄豆落在截面中的圆内的概率为,故选B.3. cos(-240°)的值为()A.B.C.D.参考答案:A4. 设满足,则A.2 B.C.1 D.参考答案:B5. sin600+tan240的值是()A.―B.C..D.参考答案:B略6. 圆柱的侧面展开图是边长为2和4的矩形,则圆柱的体积是()A.B.C.D.或参考答案:D圆柱的侧面展开图是边长为2与4的矩形,当母线为4时,圆柱的底面半径是,此时圆柱体积是;当母线为2时,圆柱的底面半径是,此时圆柱的体积是,综上所求圆柱的体积是或,故选D.7. 已知,函数f(x)=sin(x+)在(,π)单调递减。
则的取值范围是A.[,]B.[,]C.(O,]D.(0,2]参考答案:A略8. 利用斜二侧画法,作出直线AB的直观图如图所示,若O’A’=O’B’=1,则直线AB在直角坐标系中的方程为()A、 B、 C、 D、参考答案:D9. 点P(x,y)在直线x+y-4=0上,O是坐标原点,则│OP│的最小值是()A. B. C.2 D.参考答案:C略10. 设,,若,则()A. B. C. D.参考答案:A二、填空题:本大题共7小题,每小题4分,共28分11. 若则y=的最小值为▲ .参考答案:12. 在轴上与点和点等距离的点的坐标为.参考答案:略13. 记S n为等差数列{a n}的前n项和,公差为d,若,.则____,_____.参考答案:4【分析】根据等差数列的通项公式和前n项和公式,列出方程组,求得,再利用前n项和公式,即可求解.【详解】由题意,因为,所以,又由,所以,即,联立方程组,解得,所以.【点睛】本题主要考查了等差数列的通项公式,以及前n 项和公式的应用,其中解答中熟练应用等差数列的通项公式和前n 项和公式,准确计算是解答的关键,着重考查了推理与运算能力,属于基础题.14. 经过点A (0,3),且与直线y=﹣x+2垂直的直线方程是 .参考答案:y=x+3【考点】直线的一般式方程与直线的垂直关系. 【专题】直线与圆.【分析】设与直线y=﹣x+2垂直的直线方程为y=x+m ,把点A (0,3)代入解出m 即可. 【解答】解:设与直线y=﹣x+2垂直的直线方程为y=x+m , 把点A (0,3)代入可得:3=0+m ,解得m=3. ∴要求的直线方程为:y=x+3. 故答案为:y=x+3.【点评】本题考查了相互垂直的直线斜率之间的关系,属于基础题.15. 在平面直角坐标系xOy 中,记直线y =x ?2的倾斜角是θ,则θ的值为 .参考答案:由直线方程,可得,由,可得,故答案为.16. 不等式的解集为。
2019-2020学年山西大同大学浑源师范分校高三语文下学期期末试卷及答案
2019-2020学年山西大同大学浑源师范分校高三语文下学期期末试卷及答案一、现代文阅读(36分)(一)现代文阅读I(9分)阅读下面的文字,完成各题。
材料一:从乡村群众患病找“赤脚医生”,到现在签约家庭医生提供上门服务;从缺医少药看病难,到覆盖城乡的医疗卫生服务体系建立……我国医药卫生事业蓬勃发展。
新中国成立初期,全国只有医疗卫生机构3670个,医疗床位8.5万张,卫生技术人员50.5万人。
医疗设备极其简陋,医疗技术水平低下,人民群众得不到基本的医疗卫生保障。
现在,情况发生了翻天覆地的变化。
目前,我国医疗卫生机构总数达99.7万个,医疗卫生机构床位840万张,卫生技术人员达952.9万人。
70年来,我国人民健康水平显著提高,主要健康指标优于中高收入国家平均水平。
目前,居民人均预期寿命从新中国成立前的35岁上升到77岁。
我国医疗技术能力和医疗质量水平持续提升。
“互联网+医疗健康”发展迅速,远程医疗服务全面推开,覆盖所有县域医共体,所有三甲医院都开展了远程医疗服务。
国际权威医学期刊《柳叶刀》对全球195个国家和地区医疗质量和可及性排名显示,1995 年我国位列第110名,2015年提高到第60名,2016年提高到第48名,是全球上升幅度最大的国家之一。
(摘编自《健康中国步履稳健》,《人民日报》2019年6月4日)材料二:《中共中央国务院关于打赢脱贫攻坚战的决定》提出实施健康扶贫工程。
卫生健康部门进一步细化措施,将妇幼健康作为重要内容。
一是推进妇幼重大公共卫生服务项目优先保障贫困地区妇女儿童。
实现了新生儿疾病筛查项目覆盖所有贫困地区:加强贫困地区出生缺陷防治,启动实施遗传代谢病救助项目和先天性结构畸形救助项目,截至2018年底累计救助出生缺陷患儿1.3万名,拨付救助金超过1.5亿元。
二是加强对患病贫困妇女儿童的救治保障。
通过确定定点医院、诊疗方案和单病种收费标准,加强对农村贫困家庭患有儿童白血病、先天性心脏病等大病进行集中救治,并逐步扩大救治病种。
2019-2020学年山西大同大学浑源师范分校高三英语期末考试试题及参考答案
2019-2020学年山西大同大学浑源师范分校高三英语期末考试试题及参考答案第一部分阅读(共两节,满分40分)第一节(共15小题;每小题2分,满分30分)阅读下列短文,从每题所给的A、B、C、D四个选项中选出最佳选项AIn his 402nd anniversary year, Shakespeare is still rightly celebrated as a great language master and writer. But he was not the only great master of play writing to die in 1616, and he is certainly not the only writer to have left a lasting influence on theater.While less known worldwide, Tang Xianzu is considered one of Chinas greatest playwrights and is highly spoken of in that country of ancient literary and dramatic traditions.Tang was born in 1550 inLinchuan,Jiangxiprovince. Unlike Shakespeare's large body of plays,poems and sonnets (十四行诗), Tang wrote only four major plays: The Purple Hairpin, Peony Pavilion (《牡丹亭》), A Dream under the Southern bough, and Dream of Handan. The latter three were constructed around a dream narrative, a way through which Tang unlocked the emotional dimension of human desires and ambitions and explored human nature beyond the social and political limits of that time.Similar to Shakespeare, Tang's success rode the wave of a renaissance (复兴) in theater as an artistic practice. As in Shakespeare'sEngland, Tang's works became hugely popular inChinatoo. During Tang'sChina, his plays were enjoyed performed, and changed. Kunqu Opera, a form of musical drama, spread from southernChinato the whole nation and became a symbol of Chinese culture. Combining northern tune and southern music, kunqu Opera was known for its poetic language, music, dance movements and gestures. Tang's works benefited greatly from the popularity of kunqu Opera, and his plays are considered classics of kunqu Opera.While Tang and Shakespeare lived in a world away from each other, there are many things they share in common, such e humanity of their drama, their heroic figures, their love for poetic language, a lasting popularity and the anniversary during which we still celebrate them.1. Why is Shakespeare mentioned in the first paragraph?A. To describe Shakespeare's anniversary.B. To introduce the existence of Tang Xianzu.C. To explain the importance of Shakespeare.D. To suggest the less popularity of Tang Xianzu.2. What's possibly one of the main theme of Tang's works?A. Social reality.B. Female dreams.C. Human emotions.D. Political environment.3. What does the author mainly tell us in Paragraph 4?A. The influence of Kunqu Opera on Tang's works.B. Tang's success in copying Shakespeare's styles.C. The way Kunqu Opera became a symbol of Chinese culture.D. Tang's popularity for his poetic language and music.BMy first week working in a restaurant, one of the servers said something that stuck with me: Everyone should work in a restaurant for at least a year. At the time, I didn't get it, but I took the advice to heart and worked in restaurants on and off for the next eight years. Before realizing it, I mastered many important skills, one of which is communication skill.When I was little, I was so shy that I used to hide behind my mom whenever someone spoke to me. And when I first started in restaurants, I had two personalities: Restaurant Lizzy and Home Lizzy. It was easier to pretend to be a different person while at work, since it was so different from who I actually was. But gradually, the skills I learned working in restaurants helped Home Lizzy come out of her shell in the real world.When you work in a restaurant, you don't have the luxury of hiding behind your parents to avoid talking to people. I'm still 110% an introvert, but restaurant work helped me communicate. Working in a restaurant not only helped me speak clearly, deliberately and directly but also taught me how to talk about almost everything. Some guests don't want their servers to interact too much with them, and that's fine. But some sit at the bar simply to chat with you. You learn how to judge your guests' level of interest in communicating with you, and how to exit a conversation at the appropriate time.My restaurant work is something that I'm most proud of and I know I wouldn't be the person I am today without those eight years of experience. If you're still on the fence about working in a restaurant for that long, start with one year. I doubt that you'll look back.4. What did the writer think of the server's words?A. Impressive.B. Ridiculous.C. Amusing.D. Logical.5. What do we infer from Paragraph 2?A. The writer tried different jobs.B. The writer became more sociable.C. The writer used an invented name.D. The writer had a hard time at work.6. Which of the following best describes the writer's restaurant work?A. Boring.B. Relaxing.C. Worthwhile.D. Unchallenging.7. What message does the writer try to convey in this passage?A. A strong-willed soul can reach his goal.B. Things are difficult before they are easy.C. Communication skills advance your career.D. Restaurantwork helps to achieve a better self.CThe idea came to him when he least expected it. Alvin Irby was at a barbershop when he saw one of his former students sitting in the shop with a bored look on his face. That’s when Irby realized that by pairing barbershops and books, he might be able to inspire young boys to read.Alvin Irby, a former kindergarten and first-grade teacher, knows how important it is for young children to read. He also knows that young boys in particular often don’t have adult male role models who inspire them to read. “Many young boys may literally never see a man reading in school during the years when they’re learning to read because there are so few male elementary school teachers,” Irby toldMashable.That’s where the barbershops come in. Four years ago, Irby launched Barbershop Books as a way to not just get books into the hands of young boys, but also to create community reading spaces in a place where kids go frequently. Since itsinceptionin 2013, the program has created kid-friendly reading spaces in 50 barbershops in 12 states throughout the United States.Irby isn’t the first person to see the connection between barbershops and books and boys. Hair stylist Courtney Holmes, launched a program a few years ago offering free haircuts to kids as long as they read to him while he cuts their hair.That’s the kind of environment that Irby wants to promote with his program. The reading spaces created by Barbershop Books help to spark an interest in books by showing kids that reading is about more than just spelling and vocabulary skills, it’s about making reading a low-stress activity that can help them relax, laugh and have fun.“Our belief is that if we can create positive reading experiences early and often for young boys, then they will choose to read for fun,” Irby noted, adding, “This is really what Barbershop Books is about, getting young boys to say three words: I’m a reader.”8. What happened to Alvin when he was at a barbershop?A. He found it easy for young people to get bored.B. He offered a barbershop to his former student.C. He thought of a way to encourage young readers.D. He realized the importance of reading for young boys.9. What is the function of Barbershop Books?A. To attract more customers who love films.B. To provide free haircuts to book lovers.C. To show the influence of reading on children.D. To create a reading environment fbr children.10. It can be inferred from the passage that ________.A. reading is a low-stress activity that is relaxingB. Barbershop Books is only suitable for young boysC. Irby attaches great importance to school educationD. Barbershop Books can arouse (引起) young people’s interest in reading11. What does the underlined word “inception” in the 3rdparagraph mean?A. discovery.B. success.C. popularity.D. beginning.DZaki was small for his twelve years, and he was angry being treated as a child. Farid, his older brother, had been looked upon as a man long before he was Zaki’s age. Every day Farid and the other young Bahraini men went out in their wooden boats to dive for oysters (牡蛎). Many times Zaki begged to go along, but Faridalways refused to let him.So every day Zaki would go to the shallow water to practice. His grandfather, a former diver, would watch him and advise him. All morning, Zaki would practice diving beneath the waves. Every afternoon, again and again he would go underwater and hold his breath. With each day’s practice, his diving improved and he could hold his breath a little while longer. Soon Zaki felt as much at home in the water as he did out of it.Zaki rose early one day. He wanted to compete with his brother. They dived beneath the waves. Zaki opened his eyes and found himself looking into his brother’s face. Farid was smiling with confidence. Slowly, the smile was disappearing from Farid’s face. As more seconds passed, a worried look appeared on Farid’s face. Farid was realizing that Zaki could possibly beat him. Looking into Farid’s eyes, Zaki suddenly understood what losing couldmean to his brother. Never would the villagers allow him to live it down. He would be laughed at by losing to a little child. Almost without thinking, Zaki kicked his feet and rose to the surface of the water a second before Farid’s head appeared beside him.The men around them cheered and patted Farid on the back. Farid, however, put his arm around Zaki’s shoulders. “Today,” Farid announced, “we shall have a new diver among us.” Then quietly, for Zaki’s ears alone, he said “Thank you, my brother.” And Zaki knew that they both had learned that it takes more than strength to makea man.12. What is the second paragraph mainly about?A. Zaki’s grandfather was a good diver.B. Zaki liked staying at home every day.C. Zaki practised hard in the water daily.D. Zaki’s grandfather encouraged him to dive.13. Which of the following best describes Zaki according to paragraph 3?A. Considerate.B. Ambitious.C. Confident.D. Adventurous.14. What can we infer from the last sentence of the text?A. Farid beat his little brother easily.B. Zaki was as strong as his brother.C. Zaki regretted losing the competition.D. Both Farid and Zaki had grown up.15. What is the best title for the text?A. Farid’s PrideB. Zaki’s ChallengeC. Brothers’ CompetitionD. Grandfather’s Advice第二节(共5小题;每小题2分,满分10分)阅读下面短文,从短文后的选项中选出可以填入空白处的最佳选项。
2018-2019学年山西省大同市十六中学高一化学期末试题含解析
2018-2019学年山西省大同市十六中学高一化学期末试题含解析一、单选题(本大题共15个小题,每小题4分。
在每小题给出的四个选项中,只有一项符合题目要求,共60分。
)1. 下列物质中,属于弱电解质的是A.硫酸 B.氢氧化钠 C.一水合氨 D.蔗糖参考答案:C2. 可给笔记本电脑供电的甲醇燃料电池已经面世,其结构示意图如下.甲醇在催化剂作用下提供质子(H+)和电子,电子经外电路、质子经内电路到达另一电极后与氧气反应,电池总反应为:2CH3OH+3O2=2CO2+4H2O.下列说法不正确的是()A.右电极为电池正极,b处通入的物质是空气B.左电极为电池负极,a处通入的物质是空气C.负极反应式为:CH3OH+H2O﹣6e﹣=CO2+6H+D.正极反应式为:O2+4H++4e﹣=2H2O参考答案:B【考点】原电池和电解池的工作原理.【分析】A、依据图中电子流向分析,原电池中电子是从负极流向正极;电子流出的一端是负极,流入的一端为正极,得到电子发生还原反应;B、依据图中电子流向分析,原电池中电子是从负极流向正极;电子流出的一端是负极,失电子发生氧化反应;C、负极是甲醇失电子发生氧化反应,依据电极反应的产物和环境写出电极反应式;D、正极是氧气得到电子发生还原反应,氧气得到电子生成氢氧根离子,在图中是酸性介质,电极反应产物应写成水的形式.【解答】解:A、原电池中电子是从负极流向正极;电子流出的一端是负极,流入的一端为正极,得到电子发生还原反应,所以右电极为电池正极,b处通入的物质是空气,故A 正确;B、依据图中电子流向分析,原电池中电子是从负极流向正极;电子流出的一端是负极,失电子发生氧化反应;所以a处是失电子的一端,通的是甲醇,故B错误;C、负极是甲醇失电子发生氧化反应,依据电池反应和酸性环境,2CH3OH+3O2=2CO2+4H2O,负极电极反应为:CH3OH+H2O﹣6e﹣=CO2+6H+,故C正确;D、正极是氧气得到电子发生还原反应,氧气得到电子生成氢氧根离子,在图中是酸性介质,电极反应产物应写成水的形式;电池的正极反应式为:O2+4H++4e﹣=2H2O,故D正确;故选B.3. 分别加入适量下列物质,能使湿润的淀粉-KI试纸变蓝的是( )A. NaClB. Fe粉C. 盐酸D. 氯气参考答案:DA.食盐与KI不反应,不生成碘单质,则不能使湿润的KI淀粉试纸变蓝,故A不选;B. Fe粉与湿润的淀粉-KI试纸不反应,不生成碘单质,则不能使湿润的KI淀粉试纸变蓝,故B不选;C. 盐酸与KI不反应,不生成碘单质,则不能使湿润的KI淀粉试纸变蓝,故C 不选;D.氯气有强氧化性,氧化碘离子生成碘单质,能使湿润的KI淀粉试纸变蓝,故D 选;故选D。
2019-2020学年山西大同大学浑源师范分校高三生物上学期期末试题及参考答案
2019-2020学年山西大同大学浑源师范分校高三生物上学期期末试题及参考答案一、选择题:本题共15小题,每小题2分,共30分。
每小题只有一个选项符合题目要求。
1. 下图为甲状腺激素分泌的调节示意图。
下列有关叙述错误的是A.X表示下丘脑,是体温调节的中枢B.若手术切除Z,会引起激素a和b分泌减少C.幼年时甲状腺激素分泌不足,会影响脑的发育D.Y表示垂体,可分泌多种促激素和生长激素2. 使用高倍显微镜的观察顺序是①转动细准焦螺旋,直到调清物像为止①转动转换器,使高倍镜对准通光孔①在低倍镜下看清物像,再把目标移到视野中央A.①①①B.①①①C.①①①D.①①①3. 血浆中的小分子物质形成的渗透压称为晶体渗透压,下列叙述正确的是()A.晶体渗透压的大小主要取决于血浆蛋白含量的多少B.晶体渗透压下降可能不利于维持神经元的正常兴奋性C.人体维持稳态调节能力使晶体渗透压保持固定不变D.晶体渗透压升高会刺激垂体合成并分泌抗利尿激素4. 羊膜腔穿刺是产前侧的常用方法,下列不用此方法诊断的是A.某些遗传性代谢疾病B.染色体异常C.神径管缺陷D.冠心病5. 如图曲线能正确反映大豆种子萌发至幼苗过程中细胞中自由水与结合水的比值(纵轴)变化的是()A.aB.bC.cD.d6. 如图是细胞核模型图,下列有关叙述正确的是()A.细胞的遗传信息库主要与4密切相关B.人体成熟的红细胞中2很小,因此红细胞代谢较弱C.5由四层磷脂分子组成,与核质的信息交流有关D.3的存在实现了细胞核是遗传和代谢的中心7. 生长素浓度对植物不同器官的影响效应相同的一组是()A.根的向重力性和茎的背重力性B.植物的向光性和顶端优势C.茎背重力性和植物的向光性D.根的向重力性和扦插枝条生根8. “假说演绎法”是现代科学研究中常用的一种科学方法,下列属于孟德尔在发现基因分离定律时的“演绎推理”过程的是()A. 生物的性状是由遗传因子决定的,生物体细胞中遗传因子成对存在B. 若F1产生配子时成对遗传因子分离,则测交后代会出现两种性状比例接近1:1C. 由F2出现了3:1推测生物体产生配子时,成对遗传因子彼此分离D. 若F1产生配子时成对遗传因子分离,则F2中三种基因型个体比例接近1:2:19. 下列相关表述正确的是()A.端粒受损可能会导致细胞衰老B.衰老的生物体中,细胞都处于衰老状态C.细胞凋亡使细胞自主有序地死亡,对生物体是有害的D.细胞死亡是细胞凋亡的同义词10. 在自然界,种群数量的增长既是有规律的,又是复杂多样的。
山西省大同市第十六中学2019-2020学年高二数学文期末试题含解析
山西省大同市第十六中学2019-2020学年高二数学文期末试题含解析一、选择题:本大题共10小题,每小题5分,共50分。
在每小题给出的四个选项中,只有是一个符合题目要求的1. 参数方程(为参数)化为普通方程是()A BC D参考答案:D2. 下列说法中错误的是()A.先把高二年级的2000名学生编号为1到2000,再从编号为1到50的50名学生中随机抽取1名学生,其编号为,然后抽取编号为,,的学生,这样的抽样方法是系统抽样法B.线性回归直线一定过样本中心点C.若两个随机变量的线性相关性越强,则相关系数的值越接近于1D.若一组数据1、a、3的平均数是2,则该组数据的方差是参考答案:C对于A,根据抽样方法特征是数据多,抽样间隔相等,是系统抽样,A正确;对于B,线性回归直线一定过样本中心点,B正确;对于C,两个随机变量的线性相关性越强,则相关系数|r|的值越接近于1,C错误;对于D, 一组数据1、a、3的平均数是2,∴a=2;∴该组数据的方差是s2=×[(1﹣2)2+(2﹣2)2+(3﹣2)2]= ,D正确.故选:C3. 在-1和8之间插入两个数a,b,使这四个数成等差数列,则()A. a=2,b=5 B. a=-2,b=5 C. a=2,b=-5 D. a=-2,b=-5参考答案:A4. 某几何体是由一个三棱柱和一个三棱锥构成的,其三视图如图所示,则该几何体的体积为( )A. B. C.D.参考答案:A三视图还原为如图几何体,长方体削下去等高的四棱锥,剩下一个三棱锥和一个三棱柱,,故选A.5. 甲、乙、丙3位同学选修课程,从4门课程中,甲选修2门,乙、丙各选修3门,则不同的选修方案共有()A. 36种B. 48种C. 96种D. 192种参考答案:C试题分析:设4门课程分别为1,2,3,4,甲选修2门,可有1,2;1,3;1,4;2,3;2,4;3,4共6种情况,同理乙,丙均可有1,2,3;1,2,4;2,3,4;1,3,4共4种情况,∴不同的选修方案共有6×4×4=96种,故选C.6. 袋中共有6个除了颜色外完全相同的球,其中有1个红球,2个白球和3个黑球,从袋中任取两球,两球颜色为一白一黑的概率等于()A. B. C.D.参考答案:B7. “”是“函数在区间[1,+∞)上为增函数”的( )A.充分不必要条件B.必要不充分条件C.充要条件D.既不充分也不必要条件参考答案:A8. 函数的定义域为集合,函数的定义域为集合,则A. B.C.D.参考答案:A9. 已知函数的最小值是,则的最小值等于()A. B.C.2 D.3参考答案:B略10. 双曲线中,已知,则双曲线的离心率为()A.B.C.D.参考答案:A【知识点】双曲线【试题解析】因为由渐近线方程得得所以,离心率为故答案为:A二、填空题:本大题共7小题,每小题4分,共28分11. 若的三顶点是A(a,a+1), B(a-1,2a),C (1,3)且的内部及边界所有点均在表示的区域内,则a的取值范围为_______▲_____.参考答案:12. 设偶函数满足:当时,,则=________.参考答案:略13. 已知f(x)=x2+2x·f′(1),则f′(0)=_______.参考答案:-4略14. 设是定义在上的奇函数,则.参考答案:15. 两圆x2+y2﹣4x+6y=0和x2+y2﹣6x=0的连心线方程为.参考答案:3x﹣y﹣9=0【考点】圆与圆的位置关系及其判定.【专题】计算题;直线与圆.【分析】求出圆心坐标,利用点斜式,可得方程.【解答】解:两圆x2+y2﹣4x+6y=0和x2+y2﹣6x=0的圆心坐标分别为(2,﹣3),(3,0),∴连心线方程为y﹣0=(x﹣3),即3x﹣y﹣9=0.故答案为:3x﹣y﹣9=0.【点评】本题考查圆与圆的位置关系及其判定,考查直线方程,比较基础.16. 已知一个平面与正方体的12条棱的夹角均为,那么为 .参考答案:17. 某单位为了预测本单位用电量y度气温x℃之间的关系,经过调查收集某4天的数据,得到了回归方程形如=﹣2x+,且其中的=10,=40,预测当地气温为5℃时,该单位的用电量的度数为.参考答案:50【考点】BK:线性回归方程.【专题】34 :方程思想;43 :待定系数法;5I :概率与统计.【分析】根据回归方程过样本中心点求出的值,写出回归方程,利用方程计算x=5时的值.【解答】解:根据回归方程=﹣2x+过样本中心点,且=10,=40,∴=40﹣(﹣2)×10=60,∴回归方程为=﹣2x+60,当x=5时,=﹣2×5+60=50,预测当地气温为5℃时,该单位的用电量度数为50.故答案为:50.【点评】本题考查了回归方程过样本中心点的应用问题,是基础题.三、解答题:本大题共5小题,共72分。
山西省大同市十六中学2021年高二物理上学期期末试题含解析
山西省大同市十六中学2021年高二物理上学期期末试题含解析一、选择题:本题共5小题,每小题3分,共计15分.每小题只有一个选项符合题意1. (单选)在日常生活的下列操作中,符合安全用电原则的做法是:A.用湿抹布擦电灯泡B.有金属外壳的家用电器,金属外壳不接地C.发生火灾时,首先切断电源D.保险丝烧断后,可用铜丝代替保险丝接上参考答案:C2. 如图所示,ABC为等腰棱镜,两束频率不同的单色光和,分别垂直AB边射向棱镜,棱镜的对称轴OC为两束光的分界线,则下列说法正确的是()A.由玻璃射向真空发生全反射时玻璃对光的临界角比对光的小B.在玻璃中光的光速比光的小C.光的频率比光的大D.用同一装置做双缝干涉实验时,光干涉条纹间距比光的大参考答案:D3. (单选)如图所示,有一质量为m、带电量为q的油滴,被置于竖直放置的两平行金属板间的匀强电场中,设油滴是从两板中间位置,并以初速度为零进入电场的,可以判定A.油滴在电场中做抛物线运动B.油滴在电场中自由落体运动C.油滴打在极板上的运动时间只决定于电场强度和两板间距离D.油滴打在极板上的运动时间不仅决定于电场强度和两板间距离,还决定于油滴的荷质比参考答案:D4. 下列说法中正确的是()A、在参考系中,物理规律都是相同的,这就是广义相对性原理B、在不同参考系中,物理规律都是不同的,例如牛顿定律仅适用于惯性参考系C、一个均匀的引力场与一个做匀速运动的参考系等价,这就是著名的等效原理D、一个均匀的引力场与一个做匀加速运动的参考系等价,这就是著名的等效原理参考答案:AD5. 如图所示为一块手机电池的背面印有的一些符号,下列说法正确的是( )A.该电池的容量为500 mA·hB.该电池的电动势为3.6 VC.该电池工作1小时后达到的电流为500 mAD.若电池以10 mA的电流工作,可用50小时参考答案:ABD二、填空题:本题共8小题,每小题2分,共计16分6. 如图甲所示电路中,已知电源电动势E=3V,内阻r=1 ,滑动变阻器的最大阻值为20Ω,小灯泡L 的U-I图线如图乙所示,则可知小灯泡的电阻随电压增大而(填“增大”、“减小”或“不变”)。
山西省大同市第十六中学2020-2021学年高一数学文上学期期末试题含解析
山西省大同市第十六中学2020-2021学年高一数学文上学期期末试题含解析一、选择题:本大题共10小题,每小题5分,共50分。
在每小题给出的四个选项中,只有是一个符合题目要求的1. 点P(x,y)在直线x+y-4=0上,O是坐标原点,则│OP│的最小值是()A. B. C.2 D.参考答案:C略2. 设A={}, B={}, 下列各图中能表示集合A到集合B的映射是参考答案:D略3. 已知a与b均为单位向量,它们的夹角为60°,那么|a+3b|等于()A. B. C.D. 4参考答案:C4. 公差不为零的等差数列的前项和为.若是与的等比中项,,则等于()A.18 B.24 C.60 D.90参考答案:C5. 在平面四边形ABCD中,,则AB的取值范围是:A. B.C. D. (0,+∞)参考答案:A由题意得AC>AB,AC>2,因为,所以因此,选A.6. 设集合,,那么“”是“”的()A.充分而不必要条件 B.必要而不充分条件C.充分必要条件 D.既不充分也条件参考答案:B7. 方程有实根的概率为()A. B. C. D.参考答案:C8. 函数的定义域是()A.[﹣1,+∞)B.(0,+∞)C.(﹣1,+∞)D.[﹣1,0)∪(0,+∞)参考答案:D【考点】函数的定义域及其求法.【分析】根据函数成立的条件,求函数的定义域即可.【解答】解:要使函数有意义,则,即,解得x≥﹣1且x≠0,∴函数的定义域为{x|x≥﹣1且x≠0}.9. 设实数x,y满足约束条件,则的取值范围是()A.B.[0,4] C.D.[0,1] 参考答案:A作出实数x,y满足约束条件表示的平面区域,得到△ABC及其内部,其中A(﹣1,﹣2),B(0,),O(0,0).设z=F(x,y)=|x|﹣y,将直线l:z=|x|﹣y进行平移,观察直线在y轴上的截距变化,当x≥0时,直线为图形中的红色线,可得当l经过B与O点时,取得最值z∈[0,],当x<0时,直线是图形中的蓝色直线,经过A或B时取得最值,z∈[﹣,3]综上所述,z+1∈[﹣,4].故选:A.10. 如图所示框图,当n=5时,输出的值为()A.2 B.3 C.5 D.8参考答案:C第一次运行,,第二次运行,,第三次运行,,第四次运行,退出循环,输出故选C.二、 填空题:本大题共7小题,每小题4分,共28分11. 圆心是A (2,–3),半径长等于5的圆的标准方程是 ; 参考答案:略12. 若,则=▲ .参考答案:13. 已知向量,且与的夹角为锐角,则实数λ的取值范围是 .参考答案:(﹣∞,﹣4)∪(﹣4,1)【考点】平面向量数量积的性质及其运算律;数量积表示两个向量的夹角.【分析】由与的夹角为锐角,则>0,根据向量,我们要以构造一个关于λ的不等式,解不等式即可得到λ的取值范围,但要特别注意>0还包括与同向(与的夹角为0)的情况,讨论后要去掉使与同向(与的夹角为0)的λ的取值.【解答】解:∵与的夹角为锐角∴>0即2﹣2λ>0 解得λ<1当λ=﹣4时,与同向∴实数λ的取值范围是(﹣∞,﹣4)∪(﹣4,1)故答案为:(﹣∞,﹣4)∪(﹣4,1)【点评】本题考查的知识点是向量数量积的性质及运算律,由两个向量夹角为锐角,两个向量数量积大于0,我们可以寻求解答的思路,但本题才忽略>0还包括与同向(与的夹角为0)的情况,导致实数λ的取值范围扩大.14. 若三条线段的长分别为3,4,5;则用这三条线段组成 三角形(填锐角或直角或钝角) 参考答案: 直角略15. 设函数(是常数,).若在区间上具有单调性,且,则的最小正周期为_________.参考答案:π【详解】由在区间上具有单调性,且知,函数的对称中心为,由知函数的对称轴为直线,设函数的最小正周期为,所以,,即,所以,解得,故答案为.考点:函数的对称性、周期性,属于中档题.16. 若函数f (x )同时满足:①对于定义域上的任意x ,恒有②对于定义域上的任意,当时,恒有,则称函数f (x )为“理想函数”。
2019-2020学年山西大同大学浑源师范分校高三生物下学期期末试题及答案
2019-2020学年山西大同大学浑源师范分校高三生物下学期期末试题及答案一、选择题:本题共15小题,每小题2分,共30分。
每小题只有一个选项符合题目要求。
1. 某研究小组用5种植物材料进行质壁分离实验。
在相同的放大倍数下,记录视野中的细胞数目,然后滴加相同浓度的蔗糖溶液,记录从滴加蔗糖溶液到发生初始质壁分离的平均时间,绘制成下图。
下列说法正确的是()A.据图分析可知,5种植物材料中山茶细胞最小B.该实验在观察质壁分离现象时,没有设计对照实验C.5种材料发生质壁分离的时间不同,滴加清水后,质壁分离后复原时间也都不同D.据图推测,5种材料中,红花檀木细胞液的浓度最小2. 放在0.3g/ml蔗糖溶液中,会发生质壁分离的细胞是()A.人的口腔上皮细胞B.蓝藻C.洋葱表皮细胞D.植物根尖分生区细胞3. 如图为某同学在其他条件最适宜的情况下,研究pH对两种不同酶的活性影响。
下列叙述错误的是()A.据图可知这两种酶的适宜pH范围不同B.在A1、A3、A4、A6这四点,酶发生变性,完全失去活性C.若改变温度,则B1和B2点值变小,但对应的pH不变D.若将横坐标改为温度,则曲线与上图完全相同4. 原发性胆汁性胆管炎的发病机制是患者血清中的抗线粒体抗体(AMA)能与胆管上皮细胞(BEC)表面的受体结合,通过胞吞转移至细胞内,干扰了线粒体的功能,最终引起BEC凋亡。
以下推测不合理的是()A.BEC的线粒体上可能存在AMA抗原B.该病在免疫学上属于过敏反应C.患者临床可能表现乏力和肌肉酸痛D.该过程与细胞膜的信息交流功能有关5. 生物界在基本组成上的高度一致性表现在()①组成生物体的化学元素基本一致①各种生物体的蛋白质都相同①构成核酸的碱基都相同①各种生物体的核酸都相同①构成蛋白质的氨基酸都相同.A. ①①①B. ①①①C. ①①①D. ①①①6. 吃过山楂的人再次看到山楂时唾液分泌大量增加。
对该反射的叙述,错误的是()A. 唾液腺是效应器的一部分B. 感受器是眼睛C. 属于条件反射D. 不需要大脑皮层的参与7. 红细胞中的血红蛋白可以与O2结合,随血液循环将O2运输至人体各处的细胞,供细胞生命活动利用。
山西省大同市第十六中学高二数学文上学期期末试题含解析
山西省大同市第十六中学高二数学文上学期期末试题含解析一、选择题:本大题共10小题,每小题5分,共50分。
在每小题给出的四个选项中,只有是一个符合题目要求的1. 学校为了了解高二年级教学情况,对全省班、实验班、普通班、中加班的学生做分层抽样调查.假设我校高二年级总人数为N,其中全省班有学生96人.若在全省班、实验班、普通班、中加班抽取的人数分别为12,21,25,43,则总人数N为()A.801;B.808;C.853;D.912.参考答案:B2. 函数y=3x-x3的单调增区间是 ()A.(0,+∞)B.(-∞,-1)C.(-1,1)D.(1,+∞)参考答案:C3. 若曲线与直线+3有两个不同的公共点,则实数 k 的取值范围是A B C D参考答案:C易错原因:将曲线转化为时不考虑纵坐标的范围;另外没有看清过点(2,-3)且与渐近线平行的直线与双曲线的位置关系。
4. 已知集合M={(x,y)|y=f(x)},若对于任意(x1,y1)∈M,存在(x2,y2)∈M,使得x1x2+y1y2=0成立,则称集合M是“垂直对点集”.给出下列四个集合:①M={};②M={(x,y)|y=sinx+1};③M={(x,y)|y=log2x};④M={(x,y)|y=e x﹣2}.其中是“垂直对点集”的序号是()A.①②B.②③C.①④D.②④参考答案:D【分析】对于①利用渐近线互相垂直,判断其正误即可.对于②、③、④通过函数的定义域与函数的值域的范围,画出函数的图象,利用“垂直对点集”的定义,即可判断正误;【解答】解:对于①y=是以x,y轴为渐近线的双曲线,渐近线的夹角是90°,所以在同一支上,任意(x1,y1)∈M,不存在(x2,y2)∈M,满足好集合的定义;在另一支上对任意(x1,y1)∈M,不存在(x2,y2)∈M,使得x1x2+y1y2=0成立,所以不满足“垂直对点集”的定义,不是“垂直对点集”.对于②M={(x,y)|y=sinx+1},对于任意(x1,y1)∈M,存在(x2,y2)∈M,使得x1x2+y1y2=0成立,例如(0,1)、(π,0),满足“垂直对点集”的定义,所以M是“垂直对点集”;正确.对于③M={(x,y)|y=log2x},取点(1,0),曲线上不存在另外的点,使得两点与原点的连线互相垂直,所以不是“垂直对点集”.对于④M={(x,y)|y=e x﹣2},如下图红线的直角始终存在,对于任意(x1,y1)∈M,存在(x2,y2)∈M,使得x1x2+y1y2=0成立,例如取M(0,﹣1),则N(ln2,0),满足“垂直对点集”的定义,所以是“垂直对点集”;正确.所以②④正确.故选D.【点评】本题考查“垂直对点集”的定义,利用对于任意(x1,y1)∈M,存在(x2,y2)∈M,使得x1x2+y1y2=0成立,是本题解答的关键,函数的基本性质的考查,注意存在与任意的区别.5. 某考察团对全国10大城市进行职工人均工资水平x(千元)与居民人均消费水平y(千元)统计调查发现,y与x具有相关关系,回归方程为=0.66x+1.562.若某城市居民人均消费水平为7.675(千元),估计该城市人均消费额占人均工资收入的百分比约为()A.83% B.72% C.67% D.66%参考答案:A【考点】线性回归方程.【分析】把y=7.675代入回归直线方程求得x,再求的值.【解答】解:当居民人均消费水平为7.675时,则7.675=0.66x+1.562,即职工人均工资水平x≈9.262,∴人均消费额占人均工资收入的百分比为×100%≈83%.故选:A.6. 抛物线y=4x2的准线方程为()A.x=﹣1 B.x=1 C.y=﹣D.y=参考答案:C【考点】K8:抛物线的简单性质.【分析】根据题意,将抛物线的方程变形为标准方程,分析可得其焦点位置以及p的值,进而可得其准线方程,即可得答案.【解答】解:根据题意,抛物线y=4x2的标准方程为x2=,其焦点在y轴正半轴上,且p=,则其准线方程为y=﹣;故选:C.7. 下列命题中,真命题是()A. ?x0∈R,B. ?x∈R,2x>x2C. a>1,b>1是ab>1的充分不必要条件D.a+b=0的充要条件是参考答案:C指数函数恒成立,则选项A错误,当时,,选项B错误;a>1,b>1是ab>1的充分不必要条件,选项C正确;当时,由a+b=0无法得到,选项D错误;8. 设为等差数列的前项和,,则= ()A.B.C.D.2参考答案:A略9. 设曲线y=ax﹣ln(x+1)在点(0,0)处的切线方程为y=2x,则a=()A.0 B.1 C.2 D.3参考答案:D【考点】利用导数研究曲线上某点切线方程.【分析】根据导数的几何意义,即f′(x0)表示曲线f(x)在x=x0处的切线斜率,再代入计算.【解答】解:,∴y′(0)=a﹣1=2,∴a=3.故答案选D.10. 若如图所示的程序框图输出的S的值为126,则条件①为( )A .n≤5?B .n≤6?C .n≤7?D .n≤8? 参考答案:B二、 填空题:本大题共7小题,每小题4分,共28分11. 已知函数,对任意的,存在实数,使得成立,则实数a的最大值为.参考答案:12. 函数上的最大值是 ,最小值是 。
山西省大同市综合技术学校高三数学理期末试卷含解析
山西省大同市综合技术学校高三数学理期末试卷含解析一、选择题:本大题共10小题,每小题5分,共50分。
在每小题给出的四个选项中,只有是一个符合题目要求的1. 某三棱锥的三视图如所示,该三棱锥的体积为A.20 B.C.56 D.60参考答案:B略2. (改编)已知双曲线的左、右焦点分别为,过作双曲线的一条渐近线的垂线,垂足为,若的中点在双曲线上,则双曲线的离心率为()A. B. C.2 D.3参考答案:A3. 曲线在点处的切线与坐标轴围成的三角形的面积为()A B CD 参考答案:A4. 下列有关命题的说法正确的是A.命题“若,则”的否命题为:“若,则”B.“若,则,互为相反数”的逆命题为真命题C.命题“,使得”的否定是:“,均有”D.命题“若,则”的逆否命题为真命题参考答案:B“若,则”的否命题为:“若,则”,所以A错误。
若,则,互为相反数”的逆命题为若,互为相反数,则”,正确。
“,使得”的否定是:“,均有”,所以C错误。
“若,则或”,所以D错误,综上选B.5. 在等差数列中,首项公差,若,则( )A.B.C.D.参考答案:A略6. 将函数的图象向右移动个单位长度,所得的部分图象如右图所示,则的值为()A. B. C. D.参考答案:A考点:三角函数求角【思路点睛】在求角的某个三角函数值时,应注意根据条件选择恰当的函数,尽量做到所选函数在确定角的范围内为一对一函数。
①已知正切函数值,选正切函数;②已知正、余弦函数值,选正弦或余弦函数;若角的范围是,选正、余弦函数皆可;若角的范围是(0,π),选余弦函数较好;若角的范围为,选正弦函数较好7. 已知复数满足,那么复数的虚部为()A.2 B.-2 C. D.参考答案:A略8. 秦九韶是我国南宋时期著名的数学家,普州(现四川省安岳县)人,他在所著的《数书九章》中提出的多项式求值的秦九韶算法,至今仍是比较先进的算法.如图所示的程序框图给出了利用秦九韶算法求某多项式值的一个实例,若输入x的值为3,每次输入a的值均为4,输出s的值为484,则输入n的值为()A.6 B.5 C.4 D.3参考答案:C【考点】程序框图.【分析】模拟程序的运行过程,依次写出每次循环得到的s,k的值,由题意可得5>n≥4,即可得解输入n的值.【解答】解:模拟程序的运行,可得x=3,k=0,s=0,a=4s=4,k=1不满足条件k>n,执行循环体,a=4,s=16,k=2不满足条件k>n,执行循环体,a=4,s=52,k=3不满足条件k>n,执行循环体,a=4,s=160,k=4不满足条件k>n,执行循环体,a=4,s=484,k=5由题意,此时应该满足条件k>n,退出循环,输出s的值为484,可得:5>n≥4,所以输入n的值为4.故选:C.9. 设函数f(x)是定义在R上的周期为2的函数,且对任意的实数x,恒有f(x)﹣f(﹣x)=0,当x∈[﹣1,0]时,f(x)=x2,若g(x)=f(x)﹣log a x在x∈(0,+∞)上有且仅有三个零点,则a 的取值范围为()A.[3,5] B.[4,6] C.(3,5)D.(4,6)参考答案:C【考点】函数的周期性.【专题】函数思想;数形结合法;函数的性质及应用.【分析】根据函数的周期和奇偶性作出f(x)和y=log a x在(0,+∞)上的图象,根据交点个数列出不等式解出a.【解答】解:∵f(x))﹣f(﹣x)=0,∴f(x)=f(﹣x),∴f(x)是偶函数,根据函数的周期和奇偶性作出f(x)的图象如图所示:∵g(x)=f(x)﹣log a x在x∈(0,+∞)上有且仅有三个零点,∴y=f(x)和y=log a x的图象在(0,+∞)上只有三个交点,∴,解得3<a<5.故选C.【点评】本题考查了零点个数的判断,作出f(x)的函数图象是解题关键.10. 已知实数满足关系:,记满足上述关系的的集合为,则函数的最小值为()A. B. C. D.参考答案:考点:1.导数的应用;2.基本不等式的应用.【方法点睛】本题主要考察了导数与基本不等式的综合应用,属于中档题型,第一个要解决的是函数的定义域,所以根据基本不等式,得到函数的定义域,根据导数求函数的最值,涉及了二次求导的问题,一次求导后,不易得到函数的单调性,所以需要二次求导,得到一次导的最小值,再判断函数的单调性,最后求最值.二、填空题:本大题共7小题,每小题4分,共28分11. .某校选修篮球课程的学生中,高一学生有名,高二学生有名,现用分层抽样的方法在这名学生中抽取一个样本,已知在高一学生中抽取了人,则在高二学生中应抽取__________人.参考答案:812. 执行如图所示的程序框图,输出的S值为_______。