《信号检测与估计理论》期末试题
注：试题必须和答题纸一起交。一、二、三、六题必答。是学位课的同学第四题必答，
五、七题中任选1题作答；非学位课的同学四、五、七题中任选1题作答。
姓名 学号 是否学位课 得分
一、 名词解释（每题3分，任选8题作答，共24分）
1、Bayes 估计
2、似然比
3、后验概率
4、检测概率
5、信号统计检测
6、平稳过程
7、充分统计量
8、有效估计
9、接收机工作特性 10、线性最小均方误差估计
二、填空题（每空2分，共16分）
1、在信号检测理论模型中，概率转移机构是将信源输出的假设按一定的概率关系映射到 。
2、信号统计检测的贝叶斯准则就是在假设的 已知，各种代价因子赋定的情况下，使 最小的准则。
3、对于一种假设检验，它的性能主要与 有关。
4、两个联合平稳随机过程()X t 、()Y t 如果相互正交，则它们的互相关函数12(,)XY C t t 为 。
5、序列检测的基本思想是 ，最大优点是 。
6、如果随机量θ的估计值θ∧满足[][]E E θθ∧=，则称θ∧
是θ的 估计。 三、简答题（任选4题作答，每题5分， 共20分）
1、 设()X n 是实平稳随机序列，其均值为m x ，均方值为2[()]E X n ，方差为2x σ，()
X n 的自相关序列为()x R m 。试证明： (0)x R =2
[()]E X n
2、写出课本中相关器与匹配滤波器的输入输出关系表达式，说明两者输出的关系。
3、说明对接收信号x(t)=s(t)+n(t)进行波形检测的基本思路。
4、简述含随机参量的信号的统计检测方法。
5、说明参量的线性最小均方误差估计量的特性。
6、说明参量的最小二乘估计方法的基本思路。
四（10分）、在二元数字通信系统中，假设H 1时，信源输出为常值电压A ，假设H 0时，信源输出为0；信号在通信信道传输过程中叠加了高斯噪声n （t ）；在接收端对接收信号x （t ）进行N 次独立采样，样本为x k ，k=1，2，…，N ；如果噪声样本n k 是均
值为0、方差为σn 2的高斯随机变量。试确定似然比检验的判决规则；建立信号检测系
统的模型。
五（15分）、考虑发送周期为T=2π/ω0秒的移频键控（FSK ）通信系统。在假设H 1和假设H 0下发送的信号分别为：
S 0（t ）=Asin ω0 t 0≤t ≤T
S 1（t ）=Asin2ω0 t 0≤t ≤T
已知A、ω0，假设H1和假设H0是等概出现的。信号在信道传输中叠加了均值为0、功率谱密度为G n(ω)=N0/2的高斯白噪声n(t)。采用最小总错误概率准则，试求：（1）设计该通信系统的一种信号波形检测系统；（8分）
（2）说明该检测系统的总错误概率计算步骤。（7分）
六（15分）、在加性噪声中对单个随机参量θ进行估计，观测方程为：x k=εθ+ n k，k=1，2，…，N
ε为常数，n K是均值为0、方差为σn2的独立同分布高斯噪声，θ也是均值为0、方差为σθ2的高斯随机参量。试求：
(1)求θ的最小均方误差估计；（8分）
(2)能否求θ的最大似然估计？如果不能，说明理由。如果能，求θ的最大似然估计，比较两种估计结果的性能。（7分）
七（15分）、二元数字通信系统中，假设H1时，信源输出为常值电压1v，假设H0时，信源输出为电压0；信号在通信信道传输过程中叠加了均值为0、方差为0. 1的高斯噪声n（t）；如果假设H1和假设H0等概出现，Bayes检测时H0判为H0、H1判为H1的代价因子为0，H1判为H0、H0判为H1的代价因子为1。试求：
（1）Bayes检测的检测门限；（8分）
（2）总错误概率。（7分）
笔试部分（100分） Ⅰ. 单项选择。(15分) ( )1. Lucy and Lily _____ China next week. A. is visit B. are visiting C. visit D. visits ( )2. —How do you go to work? —I usually go to work _____. A. by a car B. in a car C. on a car D. by cars ( )3. —Must I finish my homework now? —No, you _____. A. may not B. mustn’t C. can’t D. needn’t ( )4. They each _____ a CD in their bags. A. have B. has C. is D. are ( )5. It is a good time _____. A. sing B. to sing C. singing D. sang ( )6. Find the answer _____ the question, please. A. of B. with C. to D. for ( )7. —_____ do you go for a picnic? —Once a month. A. How long B. How many times C. How often D. How many time ( )8. —_____ will you stay in America? —About two months. A. How many B. How often C. How long D. How ( )9. She’s good at _____. A. read B. reading C. to read D. reads ( )10. —Mum, I’ m going to Ann’ s party this evening. —_____. A. Why not B. Have a good time C. Come back early D. Good idea ( )11. —I’m going to Hawaii with my aunt this month for my holiday. —_____! A. Have a good time B. Best wishes to them C. Thand you very much D. It’s OK ( )12. —Excuse me, which is the way to the post office? —Sorry. I’m new here. —_____. A. Not at all B. Bad luck C. Thank you all the same D. Thank you ( )13. —Would you like to go for a picnic with us? —_____, but I’m too busy. A. No, I can’t B. I’d like C. Yes, I’d love to D. Why not ( )14. Leo likes _____, but he doesn’t like _____ now. A. hike; hiking B. hikes; hiking C. hiking; to hike D. hiking; hiking ( )15. The flowers smell _____. A. well B. badly C. good D. much well Ⅱ. 完形填空。（15分） One day there was an argument (争论) between the wind and the sun. “ I’m much 1 than you, ”said the wind.“No, I don’t agree with you!”said the sun. While they were arguing, they saw a man 2 along the road. He is wearing a heavy coat. The sun said to the wind, “Now, let 3 see who can make the man take 4 his coat. Then we will know who is stronger.” First the wind tried. It began to blow very hard. It blew 5 hard that the man pulled (拉)his coat around him. The wind was 6 with the man. Then it said to the sun，“Now, it’s your 7 . ” The sun started to 8 on the man. Soon it got very 9 ! The man took off his coat. The argument was over. We know the 10 was stronger now. （）1.A. strong? B. strongly C. stronger
三级安全教育考试试题 工程名称：枚皋路居住区施工单位：江苏祺顺建设发展有限公司 工种：______________ 姓名：__________________ 成绩：___________ 一、单项选择题（每题2分，共20分） 1、安全文化建设的主要任务是（C ） A、提高设备仪器的安全性能 B 、创造良好的工作环境 C、提高人们的安全修养 D 、完善安全法律法规 2、建筑施工企业应当在施工现场采取维护安全、防范危险、预防火灾等措施；并应对施工现场实行（D ）管理。 A、开放 B、沿街围墙 C、四处留门 D、封闭。 3、安全色的颜色“红、蓝、黄、绿”四种颜色分别代表（C ）。 A、警告、指令、禁止、提示B 、指令、提示、禁止、警告 C、禁止、警告、指令、提示D 、禁止、指令、警告、提示 4、安全事故中受伤人员除了本单位紧急抢救外，应迅速拨打急救中心电话（B ）进行急救。 A、119 B 、120 C、110 D、122 5、手持电动工具使用要按规定穿戴个人绝缘防护品。手持电动工具（A ） A不得随意接长电源，更换插座 B 不得随意接长电源，但可以更换插座C不得更换插座，但可以随意接长电源 D 可以随意接长电源，可以更换插座 6按照GB3805-83《安全电压》的规定，安全电压的工频有效值不超过（C ）v 。 A、20 B 、36 C 、50 D 、220 7、生产性毒物进入人体的主要途径是（C ）。 A、皮肤 B、消化道 C、呼吸道 D、眼睛 8、用人单位强令劳动者违章冒险作业，发生重大伤亡事故，造成严重后果的，对责任人员依法追究（B ）责任。 A、行政B 、刑事C 、民事D 、经济。 9、根据发生事故的原因分析，由企业的生产、设备、动力等有关职能科室，应共同研究制定预防事故（D）的措施，并落实负责人和完成时限。 A、落实责任 B、安全责任制 C、进步扩人 D、重复发生
期期末测试题 Ⅰ、Translate The Following Terms Into Chinese 、 1、entity concept 主题概念 2、depreciation折旧 3、double entry system 4、inventories 5、stable monetary unit 6、opening balance 7、current asset 8、financial report 9、prepaid expense 10、internal control 11、cash flow statement 12、cash basis 13、tangible fixed asset 14、managerial accounting 15、current liability 16、internal control 17、sales return and allowance 18、financial position 19、balance sheet 20、direct write-off method Ⅱ、Translate The Following Sentences Into Chinese 、 1、Accounting is often described as an information system、It is the system that measures business activities, processes into reports and communicates these findings to decision makers、 2、The primary users of financial information are investors and creditors、Secondary users include the public, government regulatory agencies, employees, customers, suppliers, industry groups, labor unions, other companies, and academic researchers、 3、There are two sources of assets、One is liabilities and the other is owner’s equity、Liabilities are obligations of an entity arising from past transactions or events, the settlement of which may result in the transfer or use of assets or services in the future、 资产有两个来源，一个就是负债，另一个就是所有者权益。负债就是由过去得交易或事件产生得实体得义务，其结算可能导致未来资产或服务得转让或使用。 4、Accounting elements are basic classification of accounting practices、They are essential units to present the financial position and operating result of an entity、In China, we have six groups of accounting elements、They are assets, liabilities, owner’s equity, revenue, expense and profit (income)、会计要素就是会计实践得基础分类。它们就是保护财务状况与实体经营
初一英语期末考试试题 姓名：得分： 一、选择填空.(25) 1．____is the first day of the week． A．Monday B．Tuesday C．Saturday D．Sunday 2．—What day is it today ？—It's ____ ． A．seven B．February C．Friday D．a nice day 3．—Can I have a cake？—Yes，________． A．here is it B．give you C．here you are D．I can 4．How many ____ are there？ A．bread B．rices C．dumplings D．milks 5．—Could you help me，please？—____． A．Thanks B．Certainly C．No D．You're welcome 6．Who is ____ duty today ？ A．in B．with C．on D．at 7．Let's ____ the lost books． A．to go and find B．to go and to find C．go and find D．go and go find 8．He has______ English story-book. He likes _____it very much. A. a , reading B. an , reading C. an , looking D. a , looking 9．____ Sunday morning, we have no classes. A. On B. At C. In D. For 10．They have ___ useful dictionary. We want to borrow it ____them. A. an, for B. a, from C. an, to D. a, to 11. There is________“t”and________“s”in ________ word “thanks”. A. a; an;× B. a; a; × C. a; an; the D. a; an; a 12. Listen ________ the tape and answer the questions ________ page 100. A. to; of B. of; from C. to; on D. at; in 13 .________a bird. ________ name's Polly. A. Its; It's B. It's; It's C. Its; Its D. It's; Its 14 Do you want________? A. to go to school B. speak English C. go home D. to the tree 15. ________is this blouse? ________ knows? A. Who's; Who B. Whose; Who's C. Who; Who's D. Whose; Who 16 —Is that boy twelve? —No,________. He's only eleven. A. isn't B. isn't he C. he isn't D. he not 17. We get up ___ half past six ___the morning.
二、单项选择（15分） 1. Where’s Simon from? __A____. A. Australia B. French C. English D. Chinese 2. ——__C__ do they think ____ the books? ——They love them. A. How, for B. What, for C. What, of D. How, of 3. ——How were the people there? ——__B__ unfriendly. A. They are B. They were C. He is D. She was 4. ——Do you want to watch this video? ——No, I think it’s _A___. Let’s go to the movies. A. boring B. interesting C. exciting D. funny 5. We like koalas because they’re _C___ cute. A. kinds of B. a kind of C. kind of D. a kind 6. There’re three _____ in the office. A. polices B. policeman C. policemen D. policewoman 7. ____ the park you can see an old hotel. A. Cross from B. Across from C. Turn left D. Next 8. —— Who ____ the supper yesterday? —— My father______. A. did cook, did B. cooked, did C. did, cooked D. cooked, cooked 9. Don’t ____ late for school. —— Sorry, sir. A. arrived B. arrives C.arriving D.arrive 10. ——How’s it going with you?——____. A. Sunny and cool B. Not bad C. Thin and short D. Tall 11.Where are the boys? —— Look! They _______ the flowers. A. are water B. are watering C. is watering D. are watered 12. ——____? ——I’d like a dessert. A. What do you like B. Can I help you C. Would you like a dessert D. What you would like 13. ——Who’s the woman ____ blonde hair?——Oh. It’s Cathy’s mother. A. has B. with C. wear D. of 14. --- How is the weather? ---It’s ______. A. suny B. rains C. cloudy D. wind 15. ——Welcome to China! ——____.
新工人入场三级安全教育考试试卷及答案姓名：分数： 一、判断题(对的打“√”错的打×每题2分共60分) 1、劳动保护就是为了保护劳动者在生产过程中的安全和健康。(√) ２、安全生产检查中的“三定”是定钱、定物、定人。（×） ３、能自动消除危险因素，避免事故发生的装置叫保险装置。（√) 4、使用手持电动工具时,必须戴好绝缘手套。（√) ５、操作木工机械，必须熟悉其机械性能、操作方法及操作规程。(√) 6、焊工在作业区周围有易燃、易爆物品未清除干净时可以先焊割。（×) 7、钢丝绳当其表面被磨损腐蚀超过原直径的40%时应报废更换。(×） 8、触电急救首先就地进行抢救，并送医院急救。(√） 9、建筑施工的“四口”是指楼梯口、预留洞口、电梯口、通道口。（√） 10、泡沫灭火器可用于电气设备火灾的灭火。(×） １１、施工现场危险地区夜间可不设红灯警示。（×) 12、保护劳动者在生产过程中的安全和健康是我们党和国家的一项重要政策。（√）1３、上下交叉作业有危险的出入口不必设防护棚。(×） 14、进入施工现场必须戴好安全帽,扣好帽带，禁止穿拖鞋、高跟鞋、或光脚上班。（√) １５、建筑业所指“三宝”是安全帽、安全带、安全网。(√) 16、起重机械在工作中任何人都可以从起重臂或吊物下通过。(×) １7、安全思想教育目的是增强职工安全意识，提高职工搞好安全生产的自觉性,变“要我安全”为“我要安全”。(√） 18、生产经营单位可以使用国家明令淘汰、禁止使用的危及生产安全的工艺、设备。(×) １9、建筑工程安全生产管理，必须坚持“安全第一，预防为主的方针”建立健全安全生产责任制度和群防群治制度。(√） 20、建筑施工企业应当在施工现场积极采取维护安全，防范危险，预防火灾等措施，有条件的应对施工现场实行封闭管理。（√） 21、建筑施工企业和作业人员在施工过程中，应当遵守有关安全生产的法律、法规和建筑行业安全规章、规程，不得违章指挥或违章作业。（√) 22、防护棚搭设与拆除时，应设警戒区，并应派专人监护。（√） 23、各种垂直运输接料平台,除两侧设防护栏杆外,平台口还应设置安全门或活动栏杆。 (√) 24、绑扎立柱和墙体钢筋时，不得站在钢筋骨架上或攀登骨架上下。(√)
人教版初一英语期末考试试题以及答案
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笔试部分（100分） Ⅰ. 单项选择。(15分) ( )1. Lucy and Lily _____ China next week. A. is visit B. are visiting C. visit D. visits ( )2. —How do you go to work? —I usually go to work _____. A. by a car B. in a car C. on a car D. by cars ( )3. —Must I finish my homework now? —No, you _____. A. may not B. mustn’t C. can’t D. needn’t ( )4. They each _____ a CD in their bags. A. have B. has C. is D. are ( )5. It is a good time _____. A. sing B. to sing C. singing D. sang ( )6. Find the answer _____ the question, please. A. of B. with C. to D. for ( )7. —_____ do you go for a picnic? —Once a month. A. How long B. How many times C. How often D. How many time ( )8. —_____ will you stay in America? —About two months. A. How many B. How often C. How long D. How ( )9. She’s good at _____. A. read B. reading C. to read D. reads ( )10. —Mum, I’ m going to Ann’ s party this evening. —_____. A. Why not B. Have a good time C. Come back early D. Good idea ( )11. —I’m going to Hawaii with my aunt this month for my holiday. —_____! A. Have a good time B. Best wishes to them C. Thand you very much D. It’s OK ( )12. —Excuse me, which is the way to the post office? —Sorry. I’m new here. —_____. A. Not at all B. Bad luck C. Thank you all the same D. Thank you ( )13. —Would you like to go for a picnic with us? —_____, but I’m too busy. A. No, I can’t B. I’d like C. Yes, I’d love to D. Why not ( )14. Leo likes _____, but he doesn’t like _____ now. A. hike; hiking B. hikes; hiking C. hiking; to hike D. hiking; hiking ( )15. The flowers smell _____.
三级安全教育考试试题（公司级） 姓名：单位：成绩： 一、填空题：（每题1分，共25分） 1、三级安全教育制度是企业安全教育的基础制度，三级教育是指（）、（）、（） 2、食品安全标准的性质是（） 3、当今世界各国政府采取强制手段对本国公民实施的三大安全主题是（）、（）、（） 4、我国的消防工作方针是（）、（） 5、《中华人民共和国食品安全法》从（）开始施行。 6、《中华人民共和国职业病防治法》通过的时间为（） 7、“三不伤害”活动指的是（）、（）、（） 8、危险识别和评价考虑的因素有（）、（）、（） 9、生产过程中的“三违”现象是指（）、（）、（） 10、职业病防治工作坚持（）（）的方针，实行（）（） 二、选择题（每题2分，共10分） 1、国家标准（GB2893－82）中规定的四种安全色是（） A、红、蓝、黄、绿 B、红、蓝、黑、绿 C、红、青、黄、绿 D、白、蓝、黄、绿 5、工作时，女同志手上的装饰物，如：戒子、手链等（A ） A、一律不能戴 B、可以戴 C、随便 3、漏电保护装置主要用于（） A、减小设备及线路的漏电 B、防止供电中断 C、减少线路损耗 D、防止人身触电事故及漏电火灾事故 4、在密闭场所作业（O2浓度为18％，有毒气体超标并空气不流通）时，应选用的个体防护用品为（） A、防毒口罩 B、有相应滤毒的防毒口罩 C、供应空气的呼吸保护器 D、防尘口罩 5、在下列绝缘安全工具中，属于辅助安全工具的是（）
A、绝缘棒 B、绝缘档板 C、绝缘靴 D、绝缘夹钳 三、判断题 1．食品生产者发现其生产的食品不符合食品安全标准，应当立即停止生产，召回已经上市销售的食品，通知相关生产经营者和消费者，并记录召回和通知情况。（√） 2．食品生产经营人员每年应当进行健康检查，取得健康证明后方可参加工作。（√）3、食品生产企业应当建立食品原料、食品添加剂、食品相关产品进货查验记录制度。（√）4．食品加工过程中成品与半成品可以混合存放。（×） 5、原辅料的运输不得与有毒、有害物品一同运输。（√） 6、食品生产工作人员应当保持个人卫生，可以不洗净手，必须穿戴清洁的工作衣、帽。（×） 7、食品生产使用的洗涤剂、消毒剂应当对人体安全、无害。（√） 三、简答题（每题10分，共30分） 1、操作现场违章表现范围有哪些？ 2、哪些行为为设备操作违章行为？
ACCOUNTING ENGLISH Middle-of-term Test Papers PartⅠ.Translating the following terms 1、Notes to financial statements 2、Accounting elements 3、Variable costs 4、Economic entity 5、Depreciation expense 6、Deferred income taxes 7、Nominal accounts 8、ROA 9、LIFO 10、Work in process 11、现金收支 12、原材料 13、制造费用 14、相关性 15、持续经营 16、复式记账 17、优先股 18、预付费用 19、购货退回与折让 20、永续盘存制
PartⅡ.True or False 1、 The accounting process generates financial reports for both “internal ”and “external”users. 2、The balance sheet reflects the basic accounting equation and the means of financing the organization's assets. 3、The existence of Accounts Receivable on the Balance Sheet indicates that the company has one or more creditors. 4、Liabilities are classified and presented in increasing order of liquidity. 5、Working capital equals current assets less current liabilities. 6、Declaration of dividends reduces the retained earnings portion of the owners' equity of the corporation and creates a liabilities called Dividends Payable. 7、A chart of accounts is a listing of the titles of all accounts. 8、The cash basis of accounting often violates the matching rule. 9、Closing entries convert real and nominal accounts to zero balance. 10、The work sheet is published with the balance sheet and income statement, as a supplementary statement. 11、A company's sustainable growth rate is the highest growth rate in sales it can attain without issuing new stock. 12、Only rapidly growing firms have growth management problems.
初一英语期末考试模拟试卷及答案详解（五） 七年级英语试题 注意事项： 1. 本试题分第Ⅰ卷和第Ⅱ卷两部分。第Ⅰ卷为选择题70分；第Ⅱ卷为非选择题，80分，共150分;时间120分钟。 2. 考生将第Ⅰ卷各小题的答案标号填入答题表内。 第Ⅰ卷（选择题 70分） 一、听力选择（20小题，计20分） （一）录音中有五个句子，每个句子听一遍，然后从每小题A、B、C三个选项中选出每个句子的正确应答语。 1. A. Boring. B. Relaxing. C. Awful. 2. A. Yes, we were. B. Yes, they were. C. Yes, they did. 3. A. Do some reading. B. Did her homework. C. Watched TV. 4. A. Thank you. B. I think so. C. Yes, I have. 5. A. But I like singing. B. No, I don’t. C. Sorry, Miss Green. （二）录音中有五组对话和五个问题，每组对话和问题听两遍后，从每小题A、B、C三个选项中选出能回答每个问题的正 确答案。 6. A. Tom. B. Leo. C. Tom’s mother. 7. A. Every day. B. Twice a week. C. Once a week. 8. A. Eight minutes. B. Twenty minutes. C. Twenty-five minutes. 9. A. Not bad. B. Great. C. Terrible. 10. A. In the classroom. B. In the hallways. C. In the music room. （三）录音中有一段对话和五个问题，短文和问题听两遍后，从每小题A、B、C三个选项中选出能回答每个问题的正确答 案。 11. A. She relaxes in the house. B. She relaxes in her swimming pool. C. She relaxes at home. 12. A. She went to Shanghai. B. She went to Shanghai and went to the swimming pool. C. She went to the swimming pool. 13. A. It was great. B. It was beautiful. C. It was humid. 14. A. She can’t stand it. B. She loves it. C. She doesn’t mind it. 15. A. They wear warm clothes. B. They wear cool clothes. C. They don’t bring any clothes. （四）录音中有一篇短文，听短文两遍，然后从每小题A、B、C三个选项中选出能回答每个问题的正确答案。 16. What time did Kate get up yesterday? A. At 6:30. B. At 7:30. C. At 6:00. 17. What did she do after a quick breakfast? A. Cleaned the room. B. Did some washing. C. Both A and B. 18. She had for lunch. A. rice and meat B. rice, meat and vegetables C. rice, meat and noodles 19. In the afternoon, she went to the park with her . A. friends B. cousins C. parents 20. She watched TV for after she finished her homework. A. one hour B. half an hour C. one and a half hour. 注意：请同学们翻到第Ⅱ卷，继续做第五大题——听力填表 二、单项填空(20小题，计20分) 从每小题A、B、C、D中选出能填入句中空白处的最佳答案。 21. It’s time dinner. A. for B. on C. to D. at 22. He a letter to his parents last night. A. will write B. writes C. wrote D. write
初一英语期末试题 (Unit 1~16) 第一卷（听力部分） 一、听句子，选择与图片一致的选项。（4分） 二、听句子，选择适当的答语。（6分） ( )5.A. How are you? B. How do you do? C.Fine , think you. And you? ( )6.A. Nice to meet you. B. I am very well. C. Thanks a lot. ( )7.A. It is Monday. B. It is eight thirty. C. It is my watch. ( )8.A. They are cats. B. Oh, it is theirs. C. Oh, it is new. ( )9.A. They are English books. B.I think they are our English teacher's. C. They are my good friends. ( )10.A. It's big. B. It's blue. C. It's old. 三、听对话和对话后提出的问题选择正确的答语（5分） ( ) 11. A. Kat'e B. Jim's C. LiLei's ( ) 12. A. 11: 00 B. 10: 55 C.11:05 ( ) 13. A. 11 B. 13 C.12 ( ) 14. A. On Jim's chair. B. On Jim's desk. C. On the bed. ( ) 15. A. It's 34. B. 1t's 43. C. It's 33. 四、根据短文内容，选择正确的答语。（5分） ( )16.I have ________. A. A friend B. two watches C. two friends ( )17. Jim and John are _______. A. teachers B. students C. sisters ( )18._____________ don't have a clock. A. Jim B. John C.A and B ( )19. They ___________ at about ten.
三级安全教育考试试题 工程名称： 施工单位： 姓名：成绩： 一、单项选择题（每题2分，共20分） 1、安全文化建设的主要任务是( ) A、提高设备仪器的安全性能 B、创造良好的工作环境 C、提高人们的安全修养 D、完善安全法律法规 2、建筑施工企业应当在施工现场采取维护安全、防范危险、预防火灾等措施；并应对施工现场实行（）管理。 A、开放 B、沿街围墙 C、四处留门 D、封闭。 3、安全色的颜色“红、蓝、黄、绿”四种颜色分别代表( )。 A、警告、指令、禁止、提示 B、指令、提示、禁止、警告 C、禁止、警告、指令、提示 D、禁止、指令、警告、提示 4、安全事故中受伤人员除了本单位紧急抢救外，应迅速拨打急救中心电话( )进行急救。 A、119 B、120 C、110 D、122 5、手持电动工具使用要按规定穿戴个人绝缘防护品。手持电动工具( ) A 不得随意接长电源，更换插座 B 不得随意接长电源，但可以更换插座 C 不得更换插座，但可以随意接长电源 D 可以随意接长电源，可以更换插座 6、按照GB3805—83《安全电压》的规定，安全电压的工频有效值不超过( )v。 A、20 B、36 C、50 D、220 7、生产性毒物进入人体的主要途径是( )。 A、皮肤 B、消化道 C、呼吸道 D、眼睛 8、用人单位强令劳动者违章冒险作业，发生重大伤亡事故，造成严重后果的，对责任人员依法追究（）责任。 A、行政 B、刑事 C、民事 D、经济。 9、根据发生事故的原因分析，由企业的生产、设备、动力等有关职能科室，应共同研究制定预防事故( )的措施，并落实负责人和完成时限。 A、落实责任 B、安全责任制 C、进步扩人 D、重复发生 10、我国安全生产工作的基本方针是( ) A、安全生产重于泰山 B、安全第一、以人为本
一、选择题 1、The four-stroke cycle operates in which order __C__. A. intake, exhaust, power, compression B. intake, power, compression, exhaust C. intake, compression, power, exhaust 2、With the piston at the bottom of the cylinder, the ___C____ valve ___________ to allow the burned exhaust gas to be expelled to the exhaust system. A.intake, closes B. exhaust, closes C. exhaust, opens 3、A car engine's job is to ___B__ A. Convert fuel into heat B. Convert fuel into motion C. Convert fuel into exhaust 4、When the crankshaft completes four revolutions for a four-cycle engine, each cylinder will have gone through ____B____intake stroke(s). A.one B. two C. Three 5、___C___ is the life-blood of the engine. A. gas B. water C. Oil 6、What is the core of a car's engine___C___ A.The spark plug B. exhaust C. The cylinder 7、What determines the size and the placement of the engine block____C____ A. The number of spark plugs B. The number of pistons C. The number of cylinders 8、In the standard engine, each cylinder has ___A___. A.four valves B. two valves C. one valve 9、A crankshaft's job in an engine is to ___C___ A. Deliver fuel to the cylinders B. Keep cylinder heads in place C. Change linear motion into rotational motion 10、The _____C___ system on an internal combustion engine provides the spark that ignites the combustible air/fuel mixture in the combustion chamber. A.starting B. fuel C. igniting 二、填空题 1.Today’s average car contains more than 15000 separate, individual parts that must work together. These parts can be grouped into four major categories: body，engine，chassis and electrical system . 2.The direction motion of vehicle is controlled by a steering system. A basic steering system has 3 main parts: steering control mechanism ，steering gear and steering linkage mechanism which connecting wheels and steering gear . 3.The location of the driving axle determines whether the vehicle is classified as rear-wheel?drive ，front-wheel?drive ，four-wheel?drive and all-wheel drive. 4.The modern clutch9 is a single plate, dry disc . It consists of five major parts: flywheel, clutch disc , pressure plate assembly, throw-out bearing , and clutch linkage.