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。