作业8
2019-2020学年人教版高二英语寒假作业(8)
2019-2020学年人教版高二英语寒假作业（8）一、小题练习1 no modern telecommunications, we would have to wait for weeks to get news from around the world.A.Were thereB.Had there beenC.If there areD.If there have been2、Hardly_____got out of the court_____the reporters raised a lot of questions to him.A.had he; whenB.had he; thanC.he had; whenD.did he; than3、It was too noisy outside. Not until_____at the top of my voice_____his head.A.I shouted; did he turnB.I shouted; had he turnedC.did I shout; did he turnD.had I shouted; he turned4、_____do we go for picnics.A.CertainlyB.SometimesC.SeldomD.Once5、Not until he retired from teaching three years ago ______ having a holiday abroad.A.he had consideredB.had he consideredC.he consideredD.did he consider6、So fast__________he walk that I couldn’t catch up with him.7、Only then__________(do) they realize how much damage had been caused.8、Only when Lily walked into the office __________(do) she realize that she had left the contract at home.9、__________ when we lost what we had did we realize how much we loved it.10、Never before__________she seen anybody who can play tennis as well as Robert.11、Hardly we left the dormitory the next morning when we realized we had left our map in the room.12、Not until I had read the report I understand the true state of affairs.13、He doesn’t like classic music,nor I do.14、Hardly she finished her homework when her mum asked her to play the piano.15、Only then did we realized the importance of English.二、根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。
八大特殊作业票证八个
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作业现场出现危险品泄漏，立即停止作业，撤离人员
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作业完成后现场杂物已清理
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吊装作业人员持有法定的有效的证件
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地下通讯电 （光）缆、局域网络电 （光）缆、排水沟的盖板，承重吊装机械的负重量已确认，保护措施已落实
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起吊物的质量（）t，经确认，在吊装机械的承重范围
确认人
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断开与动火设备相连接的所有管线，加盲板（ ）块
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动火点周围的下水井、地漏、地沟、电缆沟等已清除易燃物，并已采取覆盖、铺沙、水封等手 段进行隔离
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罐区内动火点同一围堰和防火间距内的油罐不同时进行脱水作业
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高处作业已采取防火花飞溅措施
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动火点周围易燃物已清除
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电焊回路线已接在焊件上，把线未穿过下水井或其他设备搭接
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夜间作业设置警示灯
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其他安全措施：
编制人：
实施安全教育人
申请单位意见
签字： 年 月 日 时 分
作业单位意见
签字： 年 月 日 时 分
有关水、电、汽、工艺、设备、消防、安全等部门会签意见
签字： 年 月 日 时 分
审批部门意见
签字： 年 月 日 时 分
完工验收
签字： 年 月 日 时 分
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作业监护措施：消防器材（ ）、救生绳（ ）、气防装备（ ）
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其他安全措施：
编制人：
实施安全教育人
申请单位意见
签字：
年
月
日
时
分
审批单位意见
签字：
年
月
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完工验收
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【小学】四年级上册数学辅导及作业 8 四舍五入法沪教版含答案
【精品】四年级上数学教辅（同步辅导及作业）沪教版8四舍五入法辅导模块1、相邻的整万数相邻的整万数就是与某数接近的整万数。
【例题1】写出与a、b、c、d相邻的整万数，在最接近它的整万数上画“√”。
解：如图，a、b、c、d相邻的整万数依次为30000和40000，60000和70000，80000和90000，40000和50000；最接近的整万数依次为30000，60000，90000，50000【例题2】试写出与24975、325841 、78932021邻的整万数。
解：与一个数相邻的两个整万数相差10000，这个数接近哪一个整万数，与这个整万数的差就小于5000，它的千位数就大于等于5，所以对千位用四舍五入法可以确定。
所以结果依次为20210、330000 、7890000小结：确定与一个数相邻的整万数的方法就是对千位数进行四舍五入。
2、相邻的整十万数相邻的整十万数就是与某数接近的整十万数。
【例题3】872021接近哪两个整十万数？并写出相应的整十万数。
解：一个数相邻的两个整十万数相差100000，这个数接近哪一个整十万数，与这个整十万数差就小于50000，它的万位数就大于等于5，所以对万位用四舍五入法可以确定。
872021相邻的两个整十万数是800000和900000，结果为900000小结：确定与一个数相邻的整十万数的方法；对万位数进行四舍五入。
3、相邻的整百万数相邻的整百万数就是与某数接近的整百万数。
【例题4】1250672接近哪两个整百万数？并写出相应的整百万数。
解析：与1250672相邻的整百万数是1000000和2021000，所以接近1000000小结：确定与一个数相邻的整百万数的方法；对十万位数进行四舍五入。
4、四舍五入法求一个数的近似数时，看被省略的尾数最高位上的数是几，如果是4或者比4小，就把尾数舍去，如果是5或者比5大，去掉尾数后，要在它的前一位加1。
这种求近似数的方法，叫做四舍五入法。
作业 第8课 百家争鸣(带答案)
第（）次作业日期：（）月（）日得分：第8课百家争鸣一、单项选择题 (5个小题，每题4分，计20分)1.哈佛大学教授、著名历史学家费正清把春秋战国时期称为“中国哲学思想的黄金时代”，其依据是当时出现了( )A．百家争鸣的活跃局面 B．竞相改革的时代风潮C．诸侯争霸的局面 D．商业繁荣的局面2．战国时期，在思想界出现了百家争鸣的繁荣局面。
下列思想家与其主张对应错误的一项是( )A．墨子——“兼爱”“非攻” B．孟子——“仁政”C．荀子——“礼治” D．韩非——“无为而治”3．面对春秋战国时期周王室衰微、诸侯争霸、政权更迭、生灵涂炭的乱局，各流派提出了不同的治世方案。
秦统一的历史证明，哪一种方案最适合当时的社会形势( )A．儒家：为政以德，仁政治国 B．墨家：互助互爱，反对战争C．法家：提倡法治，强化集权 D．道家：顺其自然，无为而治4．《论语》是先秦语录体散文的典范，它属于哪家著作（）A．法家 B．道家 C．墨家 D．儒家5.《论语·为政第二》说：“道之以政，齐之以刑，民免而无耻。
道之以德，齐之以礼，有耻且格。
”《孟子·尽心》载：“善政不如善教之得民也。
善政，民畏之；善教，民爱之。
善政得民财，善教得民心。
”据此可知，孔子孟子都强调（）A．道德教化B．兴办教育C．克已复礼D．礼法并用二、辨析改错题（2个小题，每题5分，计10分）6.战国时期道家的代表人物是荀子，他发展了老子的思想，强调治国要顺应自然和民心。
他认为人生应追求精神自由，要保持独立的人格。
错误：更正：7.孟子提出要选贤能的人治理国家，批判贵族的的奢侈生活，提倡节俭。
错误：更正：三、材料分析题（2个小题，每题10分，计20分）8．阅读下列材料，回答问题。
材料一（他）堪称人类历史上也许最成功的哲学、道德和伦理体系的创始人。
——罗兹•墨菲《亚洲史》材料二（他）因抱改革天下之宏愿，故政治活动之外更注意于教育，开中国史上民间自由讲学之第一声。
八种危险作业安全管理制度
一、目的为了加强危险作业安全管理，保障员工生命安全和身体健康，防止事故发生，特制定本制度。
二、适用范围本制度适用于公司范围内所有涉及以下八种危险作业的项目和活动：1. 高处作业；2. 有限空间作业；3. 高温、高压作业；4. 电气作业；5. 化学品作业；6. 爆破作业；7. 金属冶炼作业；8. 液化气、氧气等易燃易爆气体作业。
三、安全管理制度1. 作业许可制度（1）作业前，必须办理作业许可手续，明确作业内容、时间、地点、人员、安全措施等。
（2）作业许可应由作业负责人、安全员、相关部门负责人共同审核，确保作业安全。
2. 作业前安全教育（1）作业前，对参与作业人员进行安全教育，使其了解作业内容、安全注意事项及应急处置措施。
（2）新员工、转岗员工及特殊作业人员必须经过专门培训，取得相应资格证书后方可上岗。
3. 作业现场安全检查（1）作业前，对作业现场进行安全检查，确保安全措施落实到位。
（2）作业过程中，安全员应随时对作业现场进行巡查，发现安全隐患及时整改。
4. 个体防护（1）作业人员必须佩戴符合国家标准的安全防护用品，如安全帽、安全带、防尘口罩、防护眼镜等。
（2）特殊作业人员还需根据作业要求，配备相应的防护用品。
5. 作业应急处置（1）制定作业应急处置预案，明确事故报告、应急响应、现场救援等流程。
（2）作业人员应熟悉应急处置预案，掌握应急处置措施。
6. 作业现场环境监测（1）对作业现场进行环境监测，确保作业环境符合国家相关标准。
（2）对监测数据进行分析，及时发现并处理安全隐患。
7. 作业记录（1）建立作业记录制度，详细记录作业时间、地点、人员、作业内容、安全措施等。
（2）对作业记录进行定期检查，确保记录真实、完整。
8. 作业总结与评估（1）作业完成后，对作业过程进行总结，分析存在的问题和不足。
（2）对作业效果进行评估，提出改进措施，不断提高作业安全管理水平。
四、责任追究1. 作业负责人对本项作业的安全负责，如因管理不善导致事故发生，将依法追究其责任。
工厂里面的8大作业
工厂里面的8大作业
此处所说的八大作业指的是吊装作业、动火作业、动土作业、断路作业、高处作业、设备检修作业、盲板抽堵作业、受限空间作业等8种。
危险性作业这个词，出自国家安监总局2012年8月7日发布的《危险化学品企业事故隐患排查治理实施导则》中。
该《导则》4.1.6(2)规定:动火作业、进入受限空间作业、破土作业、临时用电作业、高处作业、断路作业、吊装作业、设备检修作业和抽堵盲板作业等为9种作业为危险性作业。
特殊作业这个词，出自《化学品生产单位特殊作业安全规范》，该规范规定:化学品生产单位设备检修过程中可能涉及的动火、进入受限空间、盲板抽堵、高处作业、吊装、临时用电、动土、断路等，对操作者本人、他人及周围建(构)筑物、设备、设施的安全可能造成危害的作业称为特殊作业。
也就是说，所谓特殊作业许可管理，包括动火作业、进入受限空间作业、盲板抽堵作业、高处作业、吊装作业、临时用电作业、动土作业、断路作业等8种。
有限空间作业的8项安全措施
有限空间作业的8项安全措施在有限空间内进行作业时，安全意识和措施尤为重要，因为有限空间通常存在着一些潜在的危险和隐患。
以下是进行有限空间作业时的8项安全措施：1.进行适当的风险评估和计划：在进行有限空间作业之前，应对有限空间进行全面的风险评估和计划。
确定所有潜在的风险和隐患，并制定相应的控制措施和预防措施。
2.使用适当的个人防护装备：进行有限空间作业时，必须始终佩戴适当的个人防护装备，如头盔、护目镜、耳塞、呼吸器等。
这些装备可以保护工人免受可能的伤害和危险。
3.确定和测试有限空间的气体和通风状况：在进入有限空间之前，必须测试空间内的气体含量和通风情况。
如果有任何可燃气体或有害气体的存在，必须采取适当的措施来确保空间安全。
4.制定有效的通信计划：有限空间内的通信通常会受到限制，因此必须制定有效的通信计划。
这可能包括使用无线电或其他通信设备，并确保所有工人都知道如何使用这些设备。
5.培训和监督工人：在进行有限空间作业之前，必须确保所有参与工作的工人接受了适当的培训，并具备必要的技能和知识。
此外，还应有专人监督作业过程，并确保工人按照安全规定执行任务。
6.设置适当的安全警示标志和标识：在有限空间周围设置适当的安全警示标志和标识非常重要。
这可以帮助工人辨认有限空间的存在，并提醒他们采取必要的安全措施。
7.定期检查和维护设备：在有限空间作业之前，必须对所有使用的设备进行定期检查和维护。
确保设备处于良好工作状态，减少故障和意外发生的可能性。
8.建立事故应急预案：在进行有限空间作业时，必须建立和实施事故应急预案。
包括培训工人如何应对紧急情况，并配备必要的急救设备和救援工具。
总之，进行有限空间作业时必须牢记安全第一，始终遵守各项安全规定和措施。
只有做好必要的准备工作，并采取适当的预防和保护措施，才能保证工人的安全和减少事故的发生。
电子技术基础 作业题8
电子技术基础 作业题8 有答案 仅供参考一、填空题：（每空分，共20分）1、两个与非门构成的基本RS 触发器的功能有 清零 、 置1 和 保持 。
电路中不允许两个输入端同时为 为低电平 ，否则将出现逻辑混乱。
2、通常把一个CP 脉冲引起触发器多次翻转的现象称为 空翻 ，有这种现象的触发器是 钟控RS 触发器，此类触发器的工作属于 电平 触发方式。
3、为有效地抑制“空翻”，人们研制出了 边沿 触发方式的 主从型JK 触发器和 维持阻塞D 触发器。
4、JK 触发器具有 置0 、 置1 、 保持 和 翻转 四种功能。
欲使JK 触发器实现nn Q Q =+1的功能，则输入端J 应接 1 ，K 应接 1 。
5、D 触发器的输入端子有 1 个，具有 置0 和 置1 的功能。
6、触发器的逻辑功能通常可用 功能真值表 、 逻辑函数式 、 状态转换图 和 时序波形图 等多种方法进行描述。
7，时序逻辑电路的基本单元是 触发器 。
8、JK D 9Q =1，Q =0时为触发器的 “1” 状态；Q =0，Q =1时为触发器的 “0” 状态。
RS ==S R 0 ，其特征方R=S= 1 ，其特征方程为 ，约束条件为 SR =0 。
触发器 的两个输入端连在一起 就构成了T 触发器，T 触发器具有的逻辑功能是 保持 和 翻转 。
13、让 T 触发器恒输入“1”就构成了T'触发器，这种触发器仅具有 翻转 功能。
二、正误识别题（每小题1分，共10分）1、仅具有保持和翻转功能的触发器是RS 触发器。
（错）2、基本的RS 触发器具有“空翻”现象。
（错）3、钟控的RS 触发器的约束条件是：R ＋S=0。
（错）4、JK 触发器的特征方程是：n n1n KQ Q J Q +=+。
（错） 5、D 触发器的输出总是跟随其输入的变化而变化。
（对） 6、CP=0时，由于JK 触发器的导引门被封锁而触发器状态不变。
（错） 7、主从型JK 触发器的从触发器开启时刻在CP 下降沿到来时。
Homework 8光华管理学院概率统计作业
Homework8October26,20111.Suppose that X1,X2,...,X n form a random sample from a normal distribution forwhich both the mean and the variance are unknown.Find the M.L.E.of the0.95 quantile of the distribution,that is,of the pointθsuch that Pr(X<θ)=0.95.2.Let X1,X2,...,X n represent a random sample from each of the distributions havingthe following probability density functions:f(x;θ)=θxθ−1,0<x<1,0<θ<∞, zero elsewhere.Show that the m.l.e. θofθis consistent.3.Suppose that a random sample is to be taken from a normal distribution for which thevalue of the meanθis unknown and the standard deviation is2.(a)How large a random sample must be taken in order that E(|X n−θ|2)≤0.1forevery possible value ofθ?(b)How large a random sample must be taken in order that E(|X n−θ|)≤0.1forevery possible value ofθ?(c)How large a random sample must be taken in order that P r(|X n−θ|≤0.1)≥0.95for every possible value ofθ?4.(Textbook Section7.7-10,Page284)Suppose that a certain drug is to be administeredto two different types of animals A and B.It is known that the mean response of animals of type A is the same as the mean response of animals of type B,but the common valueθof this mean is unknown and must be estimated.It is also known that the variance of the response of animals of type A if four times as large as the variance of the response of animals of type B.Let X1,···,X m denote the responses ofa random sample of m animals of type A,and let Y1,···,Y n denote the responses ofan independent random sample of n animals of type B.Finally,consider the estimatorˆθ=αX+(1−α)Y n.m(a)For what values ofα,m and n isˆθan unbiased estimator ofθ?(b)Forfixed values of m and n,what value ofαyields an unbiased estimator withminimum variance?5.(Textbook Section7.4-2,Page270)Suppose that X1,···,X n form a random samplefrom a normal distribution for which the meanµand the standard deviationσare unknown,and letˆµandˆσdenote the M.L.E.’s ofµandσ.For the sample size n=17,find a value of k such that P r(ˆµ>µ+kˆσ)=0.95.6.(Textbook Section7.4-3,Page270)Suppose that thefive random variables X1,···,X5are i.i.d.,and each has a standard normal distribution.Determine a constant c suchthat the random variablec(X1+X2)(X23+X24+X25)1/2will have a t distribution.。
寒假作业(8) 2022-2023学年部编版语文八年级上册(散文阅读。有答案)
寒假作业（8）——2022-2023学年八年级语文人教部编版一、阅读下面的文字，完成下面小题。
余光中的诗和他的文学批评①余光中是汉语文学非常重要的诗人，他一生共发表过一千四五百首诗，多元的题材很难妥善分类，勉强划分为：爱情亲情，如《等你，在雨中》《母难日》；小我大我，如《乡愁》《欢呼哈雷》；文学艺术，如《白玉苦瓜》《向日葵》；山川自然，如《垦丁十九首》《问海》；政治社会，如《慰一位落选人》《石器时代》；植物动物，如《太阳点名》《火金姑》；环境保护，如《控诉一支烟囱》《贝壳砂》等等。
②余光中的诗感应时代与人生，他有信有望有爱，生命体会有哀愁有欢乐，对国家民族的感情有忧有喜，对社会世事有针砭有讽刺有鼓舞有颂扬，合起来大体上映照出积极丰盛惜福感恩的人生。
诗人的一生和国家民族分不开，《乡愁》脍炙人口自不用说，就是写每七十六年“来临”地球一次的哈雷彗星，余光中也会联想到国家，昂扬表示“民族的意志永远向前/向着热腾腾的太阳，跟你一样”，充满自信与豪气。
面对空气污染，余光中诅咒工厂的大烟囱，是“毒瘾深重的大烟客……把整个城市/当作你私有的一只烟灰碟”。
③余光中的诗婉约处如宋词，阳刚处近史诗，明朗而不浅陋，耐读而不晦涩，有篇兼且有句，推崇者多，各地的读者和批评家讲之不尽。
情诗如写莲花池畔小情人，“步雨后的红莲……从姜白石的词里，有韵地……走来”，其典雅情调迷倒了多少年轻读者。
作家流沙河也极爱他的诗，曾开课讲授，称其诗可读可解更可讲——可讲的意思是可让批评家细细讲出其精彩高妙的艺术。
④余光中熟悉中英两个文学传统，知道诗是形象的思维，写诗有章法有技艺；知道怎样继承与创新；余光中新诗的形式，有格律体，但以自由体为主。
他的自由体甚有节制，创出了一种“半自由半格律”的新诗体，有人以为其创体的成就有如唐代杜甫之确立律诗体式。
⑤梁实秋曾评价说，余光中“右手写诗，左手写文，成就之高一时无两”，其实余光中既是伟大的诗人和散文家，也是杰出的评论家。
双减分层作业 8、蝴蝶的家 四年级上语文(含答案)
双减分层作业8、蝴蝶的家四年级上语文（含答案）A类基础性必做题一、读拼音，写词语。
1、它们的身体是那样qīnɡ yínɡ（），载不动一个水点；它们身上的cǎi fěn( )是那样sù jié( )，一点儿水都不能diàn wū（）上的；它们是那样的柔弱，比一片树叶还无力，怎么禁得起这měng liè ( )的风雨呢？2、天是那样的dī chén( )，云是那样的黑，雷、电、雨、风，吼叫着，zhèn hàn( )着，雨点密集地xuān rǎng( )着，风将银色的yǔmù( )xié guà( )起来，世界几乎都被冲洗遍了，就连树林内也黑压压的、水淋淋的，到处都是湿的。
这不是nán wèi( )蝴蝶吗？二、给加点字选择正确音节。
躲避．(bì pì) 震撼．(hàn ɡǎn) 喧．嚷(xuān xuàn)屋檐．(yán zhǎn) 素．洁（sù shù）炊．烟(chīu chuī )三、给加点的多音字选择正确的读音。
1、它们的家一定美丽而香甜，不像家雀．儿（qiǎo què ）似的，一下雨就飞到人们冒着炊烟的屋檐下避雨。
2、下课了，孩子们欢呼雀．跃（qiǎo què ）起来。
3、这几．( jǐ jī )张茶几．(jǐ jī )快要散架了。
四、补充词语。
（）的雨幕（）的蝴蝶（）的身体（）的风雨（）的蝴蝶（）的家五、借助语境理解加点词语的意思。
1、天是那样的低沉，云是那样的黑，雷、电、雨、风，吼叫着，震撼．．着，雨点密集地喧嚷着。
-----------------------------------------------------------------2、它们身上的彩粉是那样斑斓．．，一点儿水都不能沾。
高中英语 限时作业(8) 牛津版选修8
高二英语限时作业（8）一、单项选择：1. All of a sudden, one of the crowds threw ________ egg and it struck the speaker in _________ face.A. a; hisB. an; aC. the; theD. an; the2. As the world changes faster than ever our greatest concern is making sure _______ of these changescauses us harm.A. anyB. someC. neitherD. none3. ---- It’s very kind of you to look after the baby all day.---- Oh, that’s all right. __________, I enjoy it.A. It wasn’t anythingB. It wasn’t somethingC. It was not a thingD. It was nothing4. ---- Henry is so naughty.---- But I think he is _________ than naughty.A. much brightB. brighterC. more brightD. far brighter5. Not only ________ complain about the food, _______ refused to pay for it.A. did he; also he didB. did he; he also didC. he did; also heD. did he; he also6. The language teachers always attach great importance to ________ their students to learn everythingby heart.A. urgeB. be urgedC. urgingD. being urged7. Passengers are always reminded ________ their belongings behind when they get off a public transport.A. to not leaveB. not to leaveC. not leavingD. not to leaving8. It is said that most of the ______ treasures were discovered by chance, but not purposefully.A. buriedB. buryingC. having buriedD. having been buried9. Which is correct?A. It was not until mid-night did he come back home.B. Until it was mid-night did he come back home.C. Not until mid-night did he come back home.D. It was until mid-night that he come back home.10. No sooner ________ begun to speak than I sensed that something was wrong.A. he hasB. he hadC. had heD. did he11. Few people ________ at the sports meet.A. I know did I seeB. do I know did I seeC. I know I seeD. do I know I see12. Prices of daily goods __________ through a computer can be lower than store prices.A. are boughtB. boughtC. been boughtD. buying13. _______ time, he’ll make a first-class tennis player.A. Having givenB. To giveC. GivingD. Given14. _______ and happy, Tony stood up and accepted the prize.A. SurprisingB. SurprisedC. Being surprisedD. To be surprising15. _______ their living standards and save money for retirement, many people are doing part-time jobsof different kinds.A. To improveB. ImprovingC. ImprovedD. Improve16. A good story does not necessarily have to have a happy ending, but the reader must not be left _________.A. unsatisfiedB. unsatisfyingC. to be unsatisfyingD. being unsatisfied 17. Five people won the “ China’s Green Figure” award, a title ________ to ordinary people for their contributions to environmental protection.A. being givenB. is givenC. givenD. was given18. My aunt came to see me from the country, ________ me a full basket of fresh fruits.A. broughtB. bringingC. to bringD. had brought19. The Chinese are proud of the World Expo __________ in Shanghai in May, .A. holdB. holdingC. heldD. to be held20. It look a long time for the connection between body temperature and illness _______.A. to makeB. to be madeC. makingD. being made21. Satellites are making _______ possible commercial use of the global positioning system (GPS) originallydeveloped for the military use.A. thatB. /C. itD. what22. ________ not long before the whole house was burnt to ashes.A. It wasB. There wasC. It had beenD. There had been23. A computer is a machine _______ to perform work mathematically and to store and select informationthat has been fed into it.A. designingB. designedC. is designedD. has designed二、完形填空：Rescue efforts are 24 in China’s Sichuan province following Monday’s devastating earthquake, which 25 7.9 on the Richter Scale. According to Xinhua news agency, nearly 15,000 people have died in the disaster, with as many as 24,000 more 26 under rubbles from collapsing buildings and another 14,000 declared missing.Prime Minister Wen Jiabao has visited the area to 27 oversee relief work (救援工作), and is flying to the epicenter (震中) of the earthquake today. Chinese troops have been mobilized (调动) to 28 rescue operations and emergency aid has been air-dropped into areas that have been 29 by the disaster. Bad weather has hampered (阻碍) relief efforts and in some 30 rescuers have had to trek into the disaster area by foot and search for trapped survivors by hand as roads have been blocked by debris.Some residents of the provincial capital Chengdu have 31 to sleep in tents and government shelters for fear of aftershocks 32 more damage. One witness in Chengdu told the BBC the city’s population is helping the relief work by 33 food and water for those 34 in the surrounding countryside.35 aid has been pouring in from all over China, with the Chinese government pledging hundreds of millions of dollars. 36 donations from other countries and humanitarian organizations have also been pledged. Although full casualty figures (伤亡数字) are not yet 37 it is clear that Monday’s earthquake is the worst to 38 China since the Tangshan earthquake of 1976.24. A. taken B. used C. underway D. proceeded25. A. is measured B. measuring C. being measured D. measures26. A. trapped B. disappeared C. wrapped D. lied27. A. urgent B. personally C. voluntarily D. hastily28. A. plan B. take on C. arouse D. carry out29. A. cut off B. cut down C. cut in D. cut out30. A. ways B. cases C. occasion D. extent31. A. left B. frightened C. chosen D. volunteer32. A. bringing B. leading C. attracting D. causing33. A. offering B. producing C. giving D. donating34. A. suffered B. lived C. affected D. fled35. A. Spiritual B. Psychological C. Constructional D. Financial36. A. Sympathetic B. Dramatic C. Continued D. Substantial37. A. sure B. certain C. obvious D. decided38. A. strike B. attach C. happen D. arrive三、阅读理解：AResearchers in London and Bristol have found that men are particularly likely to yield to depression if their partners are also depressed.The finding highlights the importance of paying attention to the partners of depressed mothers, as young children themselves are vulnerable (容易受伤的) to social problems if both parents are depressed.Researchers in London and at the University of Bristol launched their study to investigate whether family structure affects the likelihood of depression in men around the time their child is born. They looked at men from traditional families, men with children from a previous relationship, men whose partners had children by a former partner and men who were not living with their partners.All 7, 108 participants filled out a questionnaire on depression, and answered questions about their age, education level and employment status. Details about the quality of their relationships with their partners, networks of friends and previous life events were also recorded.About 3.5 percent of the men and 13 percent of their partners suffered depression around the time their child was born. While men in stepfamilies or who were not living with their partners were twice as likely to get depressed as those in traditional families, this could be explained by other factors that are more common in nontraditional families, such as poor education and relationship conflicts.Even allowing for all these factors however, the partners of women who were suffering from prenatal (围产期的) depression were significantly more likely to become depressed themselves, the researchers report in an American journal. Ten percent of women who were depressed had depressed partners. For the healthy women, the figure was only 2.6 percent.Previous research suggests that families with two depressed parents may need special attention. A researcher in Atlanta has found that primary school children with two troubled parents have difficulty relating to their peers. “It’s extremely important to look at the whole family.” She says.39. What can we conclude from the first two paragraphs of this passage?A. Men often beat their children.B. Depressed women often have depressed partners.C. All young children are vulnerable to social problems.D. Women with children often have depressed partners.40. Why did researchers in London and Bristol carry out such an investigation?A. To see what kind of family environment is ideal for children to grow up in.B. To study whether family structure affects depression in men when their child is born.C. To investigate why so many men get depressed when a child is born.D. To see whether it is true that behind every depressed man there is a depressed woman.41. What kind of men are least likely to get depressed when their child was born?A. Men in stepfamilies.B. Men who were not living with their partners.C. Men in traditional families.D. Men in nontraditional families.42. According to the passage, which of the following statements is NOT true?A. Ten percent of women who were depressed had depressed partners.B. 2.6 percent of healthy women were depressed.C. Special attention should be paid to families in which both the father and the mother were depressed.D. Primary school children whose parents were both depressed couldn’t get along well with their peers. BWeddings in the United States vary as much as the people do. There are church weddings with a great deal of fanfare; there are weddings on mountain-tops with guests barefooted; and there have been weddings on the ocean floor with oxygen tanks for the guests. But many weddings, no matter where or how they are performed, include certain traditional customs.Before a couple is married, they become engaged. And then invitations are sent to those who live nearby, their close friends and their relatives who live far away. When everything is ready, then comes the most exciting moment.The wedding itself usually lasts between 20 and 40 minutes. The wedding party enters the church while the wedding march is played. The bride carrying a bouquet enters last with her father who will “give her away”. The groom enters the church from a side door. When the wedding party is gathered by the altar, the bridge and groom exchange vows. It is traditional to use the words “To have and to hold from this day forward, for better, for worse, for richer, for poorer, in sickness and in health, to love and to cherish, till death do us part”. Following the vows, the couple exchange rings. Wearing the wedding ring on the fourth finger of the left hand is an old custom.After the ceremony there is often a party, called a “reception” which gives the wedding guests an opportunity to congratulate the newlyweds. The car in which the couple leaves the church is decorated with balloons, streamers and shaving cream. The words “Just Married” are painted on the trunk or back window. The bride and groom run to the car under a shower of rice thrown by the wedding guests. When the couple drives away from the church, friends often chase them in cars, honking and drawing attention to them. And then the couple go on their honeymoon.43. Which of the following statements is true according to the passage?A. There are usually three kinds of weddings in America: weddings in churches, weddings on mountains and weddings under water.B. People usually get engaged before they get married according to their parents’ preference.C. People can choose any form of wedding and decide where and how they will be performed in America.D. Most weddings in America now doesn’t follow the traditional customs.44. People usually invite _________ to their weddings.A. those who stay in close relationship with themB. anyone who lives quite near to their houseC. only families and relativesD. all of the above45. The phrase “give her away” in the second paragraph most probably means _________.A. giving her as a gift to the groomB. releasing the bride’s secret to the groomC. showing the groom who the bridge really isD. leading the bride to the groom and formally allow her to marry him46. The friends often chase the couple in cars because _________.A. they would like to have a race with the coupleB. they would like to congratulate the coupleC. they would like to attract the attention of the coupleD. they would like to go to the reception with the coupleCROCHESTER HILLS, Michigan ---- A little more than 10 years ago, Tricia Mack was a student as Rochester Adams High School who dreamed of becoming an astronaut.Today, Ms Mack is a 27-year-old aerospace engineer for the National Aeronautics and Space Administration and is traveling to Russia to work on an international space station. It was a quick journey from Rochester Hills to NASA but instead of being an astronaut, Ms Mack is training them. She knew she wanted to be involved with outer space, even as far back as her days at West Middle School. And although Ms Mack knew where she wanted to go, she also knew what it would take. She offers simple advice for kids who might see themselves as future NASA employees: Study your maths and science.After graduating from college, she was offered a job at NASA’s Lyndon B. Johnson Space Center, just outside Houston. There, she became a very good trainer and has spent most of her time teaching astronauts how to use their $ 8 million space suits. Ms Mack teachers everything from putting on the suits to explaining how to read the warning features. Ms Mack show astronauts how to understand information on the suit itself, as well as warning they might hear in their helmets. Later, she’ll teach astronauts how to do certain thing sin their suits.“ We have a huge pool that the astronauts are placed in. They wear weights so it feels like neutral gravity (无重力)where they’re not sinking and they’re not floating to the surface,” she said. “Underwater, astronauts have a stand-in for the conditions in outer space.”Ms. Mack will continue this role as she begins work on an international space station project. More than 40 through 2,004 will be taken to the space station. Those include trips by the American shuttles and the Russian Soyuz rockets, which hold three persons.“While Russians have left astronauts on space stations for as long as one year, American crews are not expected to be on the space station longer than 180 days at a time.” Ms Mack explained.As Tricia’s mom, Barbara points out her daughter’s success shows one thing very clearly, “ Love your work and you can live your dream.” She said.47. A an engineer, Ms Mack _________.A. makes suits for astronautsB. designs equipment for Space CenterC. prepares the astronauts to the condition on outer spaceD. trains astronauts how to the shuttles or rockets48. From the text we learn that ________.A. the suits of the astronauts must be heavyB. Ms Mack wasn’t willing to accept her jobC. with the special suit, astronauts can do every bring in the spaceD. Ms Mack will have her work changed soon49. In the near future, _________.A. 2,004 lights will be taken to the space stationB. more than 40 flights to the space station will hold peopleC. American astronauts can stay in space longer than Russian astronautsD. Russians and Americans will continue their work on the space station project50. Which of the following shows the right order?a. She went to Russian to work on an International space station.b. She wanted very much to become an astronaut.c. Ms Mack taught astronauts how to use their space suits.d. Ms Mack studied in a college and graduated from it years later.e. She continued her teaching and did a good job.f. Tricia Ms Mack studied at Rochester Adams High School.g. She found a job at NASA’s Lyndon B. Johnson Space Center.A. d, g, b, a, f, e, cB. b, f, d, a , c, eC. f, d, b, g, a, c , eD. f, b, d, g, c, e, e高二英语限时作业（8）答题纸班级____________姓名_____________得分________________一、单项选择：1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20[A] [A] [A] [A] [A] [A] [A] [A] [A] [A] [A] [A] [A] [A] [A] [A] [A] [A] [A] [A][B] [B] [B] [B] [B] [B] [B] [B] [B] [B] [B] [B] [B] [B] [B] [B] [B] [B] [B] [B][C] [C] [C] [C] [C] [C] [C] [C] [C] [C] [C] [C] [C] [C] [C] [C] [C] [C] [C] [C][D] [D] [D] [D] [D] [D] [D] [D] [D] [D] [D] [D] [D] [D] [D] [D] [D] [D] [D] [D]21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40[A] [A] [A] [A] [A] [A] [A] [A] [A] [A] [A] [A] [A] [A] [A] [A] [A] [A] [A] [A][B] [B] [B] [B] [B] [B] [B] [B] [B] [B] [B] [B] [B] [B] [B] [B] [B] [B] [B] [B][C] [C] [C] [C] [C] [C] [C] [C] [C] [C] [C] [C] [C] [C] [C] [C] [C] [C] [C] [C][D] [D] [D] [D] [D] [D] [D] [D] [D] [D] [D] [D] [D] [D] [D] [D] [D] [D] [D] [D]41 42 43 44 45 46 47 48 49 50[A] [A] [A] [A] [A] [A] [A] [A] [A] [A][B] [B] [B] [B] [B] [B] [B] [B] [B] [B][C] [C] [C] [C] [C] [C] [C] [C] [C] [C][D] [D] [D] [D] [D] [D] [D] [D] [D] [D]高二英语限时作业（8）参考答案单项选择：1——5 D D D C D 6——10 C B A C C11——15 A B D B A16——23 A C B C B B A B完形填空：C D A B DA B C D DC D D B A阅读：39——42 B BC B43——46 C A D B47——50 C A D D。
马克思主义基本原理概论- 作业答案8
单选题1、“通过批判旧世界来发现新世界”是A、空想社会主义预见未来社会的方法B、马克思主义预见未来社会的方法C、唯物主义预见未来社会的方法D、唯心主义预见未来社会的方法你的答案: B2、必然王国和自由王国是社会发展的A、两种不同的状态B、两种不同的选择C、两条不同的道路D、两种不同的理想你的答案: A3、“物的依赖性关系”是A、资本主义社会以前的人与人之间的关系B、资本主义社会之中的人与人之间的关系C、社会主义社会之中的人与人之间的关系D、共产主义社会之中的人与人之间的关系你的答案: B4、“代替那存在着阶级和阶级对立的资产阶级旧社会的，将是这样一个联合体，在那里，每个人的自由发展是一切人的自由发展的条件。
”这是A、《共产党宣言》中的一段话B、《共产主义原理》中的一段话C、《哥达纲领批判》中的一段话D、《资本论》中的一段话你的答案: A5、马克思主义认为自由是A、人们选择的主动性B、人能够随心所欲，为所欲为C、人类能够摆脱必然性D、人们在对必然认识的基础之上对客观的改造你的答案: D6、在人的发展和社会发展的关系问题上，马克思主义认为A、前者是个人的理想，后者是社会的目标B、前者体现了个人价值，后者体现了社会价值C、前者和后者是彼此独立的历史发展过程D、前者和后者互为前提和基础你的答案: D7、“各尽所能，按需分配”是A、原始社会的分配方式B、阶级社会的分配方式C、社会主义社会的分配方式D、共产主义社会的分配方式你的答案: D8、马克思主义认为，消灭“三大差别”的关键在于A、消灭工业与农业的差别B、消灭城市和乡村的差别C、消灭脑力劳动和体力劳动的差别D、消灭利益差别你的答案: D多选题9、马克思主义经典作家与其他思想家预见未来社会的方法区别在于A、前者从客观规律出发，后者从理性出发B、前者侧重于一般特征的揭示，后者侧重于详尽细节的描绘C、前者通过批判旧世界发现新世界，后者凭空猜测无法知道的事情D、前者是乐观主义的态度，后者是悲观主义的态度E、两者都带有空想的色彩你的答案: A,B,C10、共产主义的含义包括A、共产主义是一种科学的理论体系B、共产主义是一种美好的幻想C、共产主义是人类社会发展的终结D、共产主义通过无产阶级革命实践去实现E、共产主义是一种理想的社会制度你的答案: A,D,E。
人教部编版五年级语文上册课后同步作业 8.冀中的地道战 (含答案)
人教部编版五年级语文上册课后同步作业8.冀中的地道战1．看拼音，写词语。
fěn suì xiàn kēng fáng ài mí huò xiūzhù( ) ( ) ( ) ( ) ( )2．写同音字组词。
[bì] 遮( ) ( )绿和氏( ) 墙( )[lüè] 侵( ) 简( ) ( )夺掳( )3．给下列句子中加粗字选择正确的解释，在括号里填上序号。
透：①（液体、光线等）渗透，穿透；②暗地里告诉；③透彻；④达到饱满的、充分的程度；⑤显露。
(1)“孑口”上装着吊板，如果敌人放毒气，就把吊板放下来挡住，不让毒气往里透。
( )(2)敌人毒辣透顶的“扫荡”被粉碎了。
( )(3)这朵花白里透红，美极了。
( )4．下面的句子可以用成语“_______________________”来概括。
神机城建立在一个山洼位置，两边是高山，只有中间一线可以通人，易守难攻，自古就是兵家必争之地。
5．照样子，在括号里填上恰当的词。
发现（敌人）粉碎( ) 创造( ) 封锁( )6．给下面的句子填上合适的关联词。
(1)( )敌人来了，我们( )钻到地道里去，让他们扑个空。
(2)人藏在洞里，( )不气闷，( )不嫌暗。
(3)他们( )进了活道，( )过不了关口。
7．缩句。
(1)冀中人民在广阔平原的地底下挖了不计其数的地道。
__________________________________________________________(2)冀中人民创造的地道战在我国抗日战争史上留下了惊人的奇迹。
__________________________________________________________8．根据课文内容填空。
课文从________、________、________等方面对冀中地道进行了介绍和说明，并对冀中地道战作了高度评价，热情颂扬了人民群众的无穷智慧和顽强的斗志。
计算机应用基础第8次作业答案
----
不能说“所有”病毒
[ 解析 ] 略
43、 下面关于网络信息安全的一些叙述中，不正确的是
___D___。
A. 网络环境下的信息系统比单机系统复杂，信息安全问题比单机更加难以得到保障
B. 网络安全的核心是操作系统的安全性，它涉及信息在存储和处理状态下的保护问题
C.防火墙是保障单位内部网络不受外部攻击的有效措施之一
--- 不一定，病毒发作才产生
34、 下列防止电脑病毒感染的方法，错误的是 A. 不随意打开来路不明的邮电 B. 不用硬盘启动 C.不用来路不明的程序 D.使用杀毒软件 [ 解析 ] 略
___B___。
35、 当软盘感染病毒，用各种清除病毒软件都不能清除病毒时，则应该对此软盘 ___C___。
A. 丢弃不用 B. 删除所有文件 C.进行格式化 D.删除 exe、 com文件 [ 解析 ] 略
__A____。
8、 通信双方对其收、发过的信息均不可抵赖的特性指的是 A. 保密性 B. 不可抵赖性 C.可用性 D.可靠性 [ 解析 ] 参考第二题的解析。
___D___。
9、 下列情况中，破坏了数据的完整性的攻击是 ___C____。
A. 假冒他人地址发送数据
B. 不承认做过信息的递交行为 ---- 破坏了数据的不可抵赖性
检查网络传送的数据是否会对网络安全构成威胁
D.网关 [ 解析 ] 略
41、 以下关于防火墙的说法，正确的是 ___A___。 A. 防火墙只能检查外部网络访问内网的合法性 B. 只要安装了防火墙，则系统就不会受到黑客的攻击 C.防火墙虽然能够提高网络的安全性，但不能保证网络绝对安全 D.防火墙的主要功能是查杀病毒 [ 解析 ] 略
第 8章 计算机信息安全
高中化学必修课时作业(8)
水生成的 HClO 漂白。C 项是 Cl2 与 H2O 反应生成的 HCl 具有酸性，HClO
具有漂白性。D 项的反应为 Cl2＋2KI===2KCl＋I2，说明 Cl2 具有氧化性。
新教材•化学(RJ)8．必用修下•第列一两册 种方法制取氯气：
新教材·化学（RJ） 必修·第一册
①用含氯化氢 146 g 的浓盐酸与足量的二氧化锰反应；
3．(2021·银川一中期末)在氯水中存在多种分子和离子，它们在不同的反
应中表现各自的性质，下列关于氯水的说法不正确的是( C )
A．氯水放置数天后 pH 将变小
B．加入有色布条，布条褪色，说明溶液中有 HClO
C．氯水和液氯都是混合物
D．新制氯水可使蓝色石蕊试纸先变红后褪色
新教材•化学(RJ) 必修•第一册
(4)家庭中使用漂白粉时，为了增强漂白能力，可加入少量的物质是___B_____。
A．食盐
B．食醋
C．烧碱
D．纯碱
新教材•化学(RJ) 必修•第一册
新教材·化学（RJ） 必修·第一册
解析：(1)MnO2 与浓盐酸在加热条件下发生反应 MnO2＋4HCl(浓)==△===
MnCl2＋Cl2↑＋2H2O；
新教材•化学(RJ) 必修•第一册
新教材·化学（RJ） 必修·第一册
(2)漂白粉将在 U 形管中产生，其化学方程式是__2_C_l_2_＋__2_C_a_(_O__H_)_2_=_=_=_C__a_C_l_2_＋___ ___C_a_(_C__lO__)_2＋__2_H__2_O___。
(3)C 装置的作用是___吸__收__多__余___C_l_2，___防__止__空__气__污__染_____。
应，制得 Cl2 多。故产生 Cl2：②>①。
2020年新目标英语八年级上册寒假作业八 (含答案)
2020年新目标英语八年级上册寒假作业Unit 8寒假作业一、单项选择（15小题，每小题1分，共15分）1. —________ apples do we need to make fruit salad?—Let me think...We need three apples.A. How longB. How oftenC. How muchD. How many2. Pour the milk ________ the blender.A. ofB. intoC. onD. at3. How many ______ can you see in the picture?A. boxB. booksC. manD. woman4. Lucy put a lot of _____ in _____ of tea.A. sugar, the two cupB. sugars, the two cupsC. sugar, the two cupsD. sugars, the cups5. –Why not ____ some sugar ____ the coffee? - That sounds great.A. put, atB. add, toC. add, withD. add, /6. —Can I fill the box ________ my model cars?—I'm afraid not. It's full ________ my school things.A. with; withB. of; ofC. of; withD. with; of7. How beautiful the place is! I really want to stay here for ________ days.A. two anotherB. other twoC. another twoD. two other8. Add some ________ to your water and it will taste better.A. cornB. pepperC. honeyD. lettuce9.There _____ two pieces of bread on the table and there _____ some cheese on the slices.A.are; areB.are; isC.is; isD.is; are10.Tina tried many times, and _______ succeeded.A.firstB.nextC.finallyD.hardly11.Can I _________ the TV, Dad? I want to watch the sports news.A.turn offB.turn onC.turn downD.turn up12.It's 7：00 a．m.The air is fresh.It's a good time ________.A．exercise B．to exercise C．exercising D．to exercising13.For this reason,we'll have to wait for ________ three weeks for the results.A．another B．more C．other D．much14. —Sorry, I’m late.—________ tell me the bus broke down again!A. Never toB. NotC. Don’tD. No15.—Well,________！The class is over.—Bye,Miss Yang.A.that's OKB.that's itC.it's nothingD.it's all right二、完形填空（10小题，每小题1分，共10分）先通读短文，掌握其大意，然后从A、B、C、D四个选项中选出一个可以填入相应空白处的最佳答案。
受限空间作业八个必须八个严禁
受限空间作业八个必须、八个严禁
1.必须制定科学合理的安全技术措施,严格实行作业审批制度,严禁无批准措施组织作业;
2.必须开展危险源辨识和风险评估,编制完善的岗位标准作业流程,严禁无流程上岗作业;
3.必须严格执行领导干部到岗到位制度,严禁现场无领导干部跟班进行作业;
4.必须做到“先通风、再检测、后作业”,严禁通风、检测不合格作业;
5.必须配备个人防中毒窒息等防护装备,受限空间入口处设置隔离设施和安全警示标识,严禁无防护监护措施进入受限空间作业;
6.必须对作业人员进行安全培训,严禁教育培训不合格上岗作业;
7.必须对高风险作业场所安装安全视频监视系统和危险气体实时监测系统,严禁在无监视监测的情况下进行作业;
8.必须制定应急措施,现场配备应急装备,严禁盲目施救;。
8大高危作业流程
8大高危作业流程随着工业化进程的加速，各类高危作业也越来越多地出现在我们的生活中。
高危作业指的是在作业过程中存在较高风险的工作，需要特殊的安全措施和技术手段来保障作业人员的安全。
本文将介绍8大高危作业流程，以加深对这些作业的了解和认识。
1. 高处作业流程高处作业是指在离地面较高的位置进行的作业，如建筑施工中的高空作业、电线杆上的维修等。
在高处作业中，必须严格遵守安全操作规程，使用安全防护设施，如安全带、脚手架等，以防止人员从高处坠落。
2. 高温作业流程高温作业是指在高温环境下进行的作业，如冶金行业的炼铁、炼钢等。
高温作业中，作业人员需要佩戴适合的防护服装和防护用品，以防止热源对人体的伤害，并严格控制作业时间和强度，避免热中暑等事故的发生。
3. 有毒作业流程有毒作业是指在有毒环境下进行的作业，如化工行业的有毒气体处理、危险废物处理等。
有毒作业中，必须使用合适的防毒面具、防护服等防护装备，同时要进行有效的通风处理，确保作业人员的安全。
4. 爆破作业流程爆破作业是指在工程建设、矿山开采等领域中使用爆炸物进行的作业。
爆破作业必须由专业人员进行，严格按照爆破设计方案操作，确保爆破过程的安全和准确性，以防止爆炸事故的发生。
5. 垂直运输作业流程垂直运输作业是指在建筑施工、物流等领域中进行的垂直方向上的物品运输作业，如吊装、起重机操作等。
垂直运输作业必须依据作业物品的重量和尺寸选择合适的起重设备，同时要确保作业过程中的平衡和稳定，以防止物品坠落和人员伤亡。
6. 焊接作业流程焊接作业是指利用高温将金属或非金属材料连接在一起的工艺。
焊接作业需要焊工具和焊接材料，并严格遵守焊接安全规范，如佩戴焊接面罩、手套等防护装备，确保焊接过程的安全和质量。
7. 挖掘作业流程挖掘作业是指在建筑施工、矿山开采等领域中进行的土方开挖作业。
挖掘作业中，必须使用合适的挖掘机械设备，并由经过培训和持证上岗的操作人员进行操作，以确保挖掘过程的安全和效率。
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作业8：摩擦力（１）2014年月日
1、关于摩擦力，下列说法中错误
．．的是（）Ａ．滑动摩擦力的大小跟物体间的压力和接触面的粗糙程度有关
Ｂ．在相同条件下，滚动摩擦比滑动摩擦小
Ｃ．在任何情况下摩擦力总是有害的
Ｄ．轮胎上有凹凸不平的花纹，是为了增大摩擦
2、骑自行车的人，遇到紧急情况刹车时，用力捏闸，其目的是为了（）A．增大压力以增大摩擦B．使接触面粗糙以增大摩擦
C．减小摩擦D．以上说法都不对
3、关于滑动摩擦力的大小，下列说法正确的是（）
A 两木块的接触面积越大，滑动摩擦力就越大
B 在同一个接触面上滑动时，木块所受的滑动摩擦力随压力的增加而增大
C 两木块相对滑动得越快，滑动摩擦力就越大
D 只要接触面粗糙，两木块间就存在着滑动摩擦力
4、下列生活实例中，属于减小摩擦的是（）A．向车的转轴处加润滑油B．鞋底的花纹
C．在结冰的路面上撒上煤渣D．拔河时要用力抓紧绳子
5、在如图所示的方法中，属于增大摩擦的是（）
6、下列实例中，为了减小有害磨擦的是（）A．擦黑板时，用力压紧板刷B．鞋底上刻有凹凸不平的花纹
C．在拔河比赛中，用力握紧绳子D．旅行箱下装有小轮
作业9：摩擦力（２） 2014年月日
1、摩擦与我们的生活息息相关，假如没有摩擦下列现象不可能发生的是（）A．老师仍能用粉笔在黑板上写字B．人无法走路
C．火柴头难以划燃D．自行车刹车失灵
2、图中描述的是小红同学用手探究滑动摩擦力大小跟哪些因素
有关的情景。
用手分别压在玻璃板和桌面滑动（甲、乙），然后
用另一只手压在手上在桌面滑动（丙）。
下面说法中正确的是
（）
A.甲和乙是探究滑动摩擦力与接触面粗糙程度的关系
B.乙和丙是探究滑动摩擦力与压力大小的关系
C.比较甲和乙，感觉甲的阻力大
D.比较乙和丙，感觉丙的阻力大
3、下列各种摩擦中，属于有害摩擦的是，属于有益摩擦的是．
①机器运转时，各部件之间的摩擦②拔河比赛时，手与绳之间的摩擦
③汽车行驶时与空气之间的摩擦④吃饭时，筷子与食物之间的摩擦
4、如下左图所示，小芳在做“探究影响滑动摩擦力大小因素”的实验时，操作的错误是________．纠正错误后，应拉动弹簧测力计使木块作________运动．若在木块上再放一个砝码，则木块运动时受到的滑动摩擦力将________（选填：“变大”、“变小”或“不变”）。
5、如上右图所示，人在一般情况下步行前进时，若鞋底与地面没有打滑，地面对鞋底的摩擦力方向是向________（选填：“前”或“后”）．仔细观察发现鞋底的表面制成凹凸不平的花纹，这是采用________________的方法来增大摩擦的。
6、仔细观察左图，说明力的作用效果不仅跟力
的大小、方向有关，还跟力的________有关；
观察右图发现，将滑动变为
________的方式可以减小摩擦。