限时作业8
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
25
起吊物的质量（）t，经确认，在吊装机械的承重范围
确认人
2
断开与动火设备相连接的所有管线，加盲板（ ）块
3
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
4
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
3
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
10
作业监护措施：消防器材（ ）、救生绳（ ）、气防装备（ ）
11
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
日
时
分
完工验收
签字：
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。
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。
语文园地八(分层作业)-【上好课】 五年级语文上册同步高效课堂系列 (统编版)
语文园地八分层作业（1）这是_____代书法家______的书法作品。
（2）他的书法作品的特点是( )A．用笔横轻竖重，结构方中呈圆，气概宏大，圆润浑厚。
B．他的楷书用笔方整，笔力刚劲，点画的起、收及转折处一丝不苟。
6．沟通平台。
我们应怎样选择适合自己读的课外书？( )A．读与所学课文有关的书籍。
B．读与所学课文类别相同的书籍。
C．读所学课文的作者写的其他的书籍。
D．读课文中提到的书籍。
E．遇到什么读什么。
F．别人推举什么就读什么。
7．依据课文内容填空，并按要求完成练习。
（1）半亩方塘一鉴开，________________。
________________，此日中流拘束行。
敏而好学，________________。
默而识之，________________，________________。
写两句课外积累的关于读书诗句：________________，________________。
（2）关于书籍，历来被文人墨客所津津乐道，我知道的有：书被人们称为________________；莎士比亚说“________________________________。
”鲁迅说：“________________________________。
”高尔基说：“________________________________。
”________________说：“________________________________。
”8．仿按例句，写比方句。
（1）例句：一本你宠爱的书就是一位伴侣，也是一处你随时想去就去的故地。
书是________________，也是_______________________________。
书是________________，也是_______________________________。
【参考答案】积累与运用1．C【详解】本题考查字音。
A．斩．断（zǎn）——zhǎn。
萧红中学八年级下学期四月份语文线上限时作业带答案解析
萧红中学八年级下学期四月份语文线上限时作业一、选择题(共24 分)1.下列词语中加点字注音完全正确的一项是（）A.屹．立（qǐ）偏僻．（pì）挑拨离间．（jiàn）B.登．时（dēng）龟．裂（jūn）强．词夺理（qiǎng）C.蛮横．（hèng）卑劣．（liè）阴奉阳违．（wěi）D.瞭．望（liào）束．缚（sù）戛．然而止（jiá）【答案】B【解析】【详解】本题考查易误读常见字。
A．屹．立（qǐ）——yì；C．阴奉阳违．（wěi）——wéi；D．束．缚（sù）——shù；故选B。
2.下列词语中没有错别字的一项是（）A.家眷震憾天衣无缝B.次第抉择格物至知C.缅怀仿徨不知所措D.凋零襁褓平易近人【答案】D【解析】【详解】本题考查常见易错字。
A．震憾——震撼；B．格物至知——格物致知；C．仿徨——彷徨；故选D。
3.对下面病句的修改不正确的一项是（）A.人与人之间最大的差距，不是努力的深度，而是思维的程度。
（将“深度”与“程度”调换位置）B.4月21日，教育部召集新闻发布公，介绍义务教育课程方案和课程标准修订情况。
（将“召集”改为“召开”）C.神舟十三号载人飞船，完成全部既定任务，结束了约180余天的太空旅行，成功返回地球。
（将“约”删去）D.《小城三月》讲述了一个美丽善良的姑娘对自由、幸福的向往与追求，以及最终被传统的宗法制度所吞噬、香消玉殒。
（在“向往追求”后面加“的故事”）【答案】D【解析】【详解】本题考查病句辨析及修改。
D.成分残缺，应在“香消玉殒”后加“的故事”；故选D。
4.下列信息叙述不正确的一项是（）A.阿西莫夫，美国科普作家、科幻小说家。
代表作有《基地》《新疆域》等。
B.傅雷是一位杰出的翻译家。
他一生翻译法国文学作品和学术著作30余种，其中最具代表性的有巴尔扎克的《欧也妮·葛朗台》、罗曼·罗兰的《约翰·克里斯朵夫》等。
高中语文第6课辛弃疾词两首课时作业8(含解析)新人教版必修4
Ⅰ必备知识巩固训练阅读下面的文字，完成1～3题。
“薜荔”是古诗文中________的意象。
古代文人仕途困惑，怀才不遇，身处逆境，常借薜荔抒情，以解心愁。
中唐诗人柳宗元被贬柳州时写道“惊风乱飐芙蓉水，密雨斜侵薜荔墙”，晚唐诗人沈彬亦有诗云“薜荔惹烟笼蟋蟀，芰荷翻雨泼鸳鸯”，诗中因薜荔而生出凄楚的意味。
有趣的是，薜荔也有另外一面。
薜荔不随波逐流，在________中生长，延伸着碧绿的藤蔓，任密雨斜侵，依然绿意盎然，活出自己的精彩。
屈原《离骚》中就有“揽木根以结茝兮，贯薜荔之落蕊”的诗句，借薜荔这种芳草来表达清高芳洁之意。
夏天来了，薜荔更显出一片生机，藤条扶摇直上，________地攀缘吸附于墙壁，构成一扇天然的绿壁，任凭风雨雷电袭击，也不能撕扯分离它们。
( )。
待到挂果时，薜荔藤叶丛里挂满了青果，煞是可爱。
初唐宋之问“薜荔摇青气，桄榔翳碧苔”，描写了蔓生浓绿的薜荔、亭亭玉立的桄榔与碧苔相映成趣的景致，令人________。
1．依次填入文中横线上的词语，全都恰当的一项是( )A．司空见惯寂静坚强心驰神往B．层出不穷寂寞坚强爽心悦目C．司空见惯寂寞坚韧心驰神往D．层出不穷寂静坚韧爽心悦目答案 C解析司空见惯：看惯了就不觉得奇怪。
层出不穷：接连不断地出现，没有穷尽。
文中说“薜荔”这一意象在古诗文中常见，用“司空见惯”更恰当。
寂寞：孤单冷清；清静，寂静。
寂静：没有声音，很静。
此处强调薜荔生长的一种环境，用“寂寞”更恰当。
坚韧：坚固有韧性。
坚强：强固有力，不可动摇或摧毁。
此处强调藤条的某种品质，用“坚韧”更恰当。
心驰神往：心神飞到(向往的地方)，形容非常向往。
爽心悦目：因欣赏美好的情景而心情舒畅。
文中是指诗歌描写生动，不是指眼前景色美好，故用“心驰神往”更恰当。
2．文中画横线的句子有语病，下列修改最恰当的一项是( )A．古代一些文人仕途不顺，他们怀才不遇，身处逆境，常借薜荔抒情，以解心愁。
B．古代文人仕途多困惑或怀才不遇，或身处逆境，常借薜荔抒情，以解心愁。
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。
Unit 8课时作业 人教版八年级上册英语
Unit 8How do you make a banana milk shake?Section A一.根据句意用所给词的适当形式填空。
1.These(tomato) are red.2.Let her(peel) the apples.3.How much (bread) does he need?4.Can you give me two bottles of (orange),please?5.(not eat) it.It’s too salty.6.(open) the door,please!7.(not make) any noise in class!8.How much(water ) is there in the bottle?9.The(child) are playing games on the playground now.10.How many beef(noodle) would you like?二.单项选择。
( )11.Could you please put some in my cup?I’d like sweet coffee.A.sugarB.saltC.iceD.yogurt( )12.Would you please the light?I can’t sleep we ll with it on.A.turn onB.turn offC.turn toD.turn around ( )13.They walked for an hour,and arrived at the small village.A.clearlyB.quicklyC.finallyD.loudly( )14.If you give me ten minut es,I’m sure I will do better.A.someB.anotherC.otherD.any( )15.—Jenny,pass me some milk. —OK, Mom.do you need?A.How muchB.How manyC.How oftenD.How long ( )16.—cups of orange juice are there on the table? —Five.A.How oftenB.How muchC.How manyD.How long ( )17.him the bad news.He will be sad if he knows it.A.Not to tellB.Don’t tellC.Not tellingD.Not tell ( )18.My father bought two when he came back from the supermarket.kB.breadC.watchD.watermelons ( )19.Please here earlier!We don’t want to miss the last bus to the library.A.arriveB.to arriveC.arrivingD.arrives( )20.to turn off all the lights when you go out.A.RememberB.To rememberC.RememberingD.Remembers ( )21.—The noodles are so long.Why don’t you? —Oh,they are a symbol of long life.A.cut them downB.cut them outC.cut them upD.cut across them ( )22.—Would you like to have apples? —No,thank you.I’m full.A.other twoB.two otherC.more twoD.another two( )23.—bananas do you need? —Three.A.How oftenB.How muchC.How manyD.How soon ( )24.Don’t forget to the blender after the shake is ready.A.turn onB.turn offC.turn downD.turn up( )25.—Don’t be late for class next time. —.A.Sorry,I won’tB.Sorry,I willC.Of course,I willD.Sorry,I do三.完形填空。
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。
「青岛版小学数学四年级上册限时作业」
四年级数学上册限时作业第一单元信息窗１《万以上数的读法》一、填空1、1０个一千是( ），10个一万是（），( ）个一千万是一亿。
2、从个位起,第5位是( ），第九位是（）。
3、和千万位相邻的数位是( ）和（）。
4、每相邻两个计数单位间的进率都是（）。
５、９0６7３40０0这个数中的３在( )位上,表示3个( ）,亿位上是( ）,表示( ）个（)。
二、读一读9372684读作：１７０654200读作：88５1800读作:13400０00000读作：三、判断1、从右边起，每一个数位是一级。
( ）2、79３００40中的“９”表示９个十万。
（）3、1０3005８读作一百万零三万零五十八。
（)4、一个数由3个亿,6个十万组成,这个数是3006000０0。
（）５、30７０００8０读作三百零七万零八十。
（）四、连一连四百二十八万三千七百五十６00６4000十四万零三十五4283750九千八百四十三万四千 984340００六千零六万四千 140０35四年级数学上册限时作业第一单元信息窗2《万以上数的写法》一、选择１、写含有三级的数时,先写( )。
Ａ.个级 B.万级 C.亿级2、写一千零五万三百一十时,需写出( ）个0。
A.2B.3 Ｃ.43、读作九千零一十万零八十的数是（)。
A.901０0８0 Ｂ．901００0８0 C.９０1008004、300０0+５00+９＝( ）。
A.350009 B.3０05009 C.3０5０9５、一个数由４个亿,７个百万,3个万和2个百组成，这个数写作( )。
A．４070３0２00 B．40７003200 C.4０703０0２0０二、写一写二百万写作:七千三百零五万零四十写作：二千零七万八千六百写作：九亿零四十二万八千写作:三、写出由下面各数组成的数。
1.七十万和三千( )2.八千万、四十万和五百（）3．九百万、六万和二十( )4.两千万、二万和二（）5.七千万、五十万、三千( ）第一单元信息窗３《万以上数的比较大小》一、在○里填上“>”、“<”或“=”。
领跑作业本周末限时练语文八年级电子版
领跑作业本周末限时练语文八年级电子版1、21. 下列句子中没有语病的一项是（）[单选题] *A．临近期末，同学们的学习态度和学习成绩都有很大的提高。
B．中餐的推广使豆腐日益受到各国的欢迎是可以预期的。
C．我们一定要跳出惯性思维，提高思想认识，着力保护生态环境，促进经济转型。
(正确答案)D．通过哈桑的誓言“为你，千千万万遍”，使我懂得了朋友间友谊的珍贵。
2、1“说”是古代的一种议论文体。
[判断题] *对错(正确答案)3、1“令尊”“令堂”是对自己父母的谦称。
[判断题] *对(正确答案)错4、1老刘庆祝生日，对好友说：“明天是我的生日，特邀请你来贵府一叙，你不会拒绝吧？”他这样表述是得体的。
[判断题] *对(正确答案)错5、袅娜中的娜读作（）[单选题] *nānǎnuó(正确答案)nuò6、1“爱而不见”的下一句是“俟我于城隅。
”[判断题] *对(正确答案)错7、下列中括号内字注音无误的一项是（）[单选题] *A.杏[仁]（rén）火[炽]（chì）[暂]时（zàn）(正确答案)B.机[杼]（zhù）一[钹]（bá）[犬]牙（quǎn）C.[叛]乱（pàn）褴[褛]（lǚ）坚[劲]（jìn）D.[溶]解（róng) [燕]山（yàn）惆[怅]（chàng）8、1《致橡树》作者舒婷，是中国著名女诗人，朦胧诗派的代表人物之一。
[判断题] *对(正确答案)错9、“秩序”的读音是“chìxù”。
[判断题] *对错(正确答案)10、1“锲而舍之，朽木不折；锲而不舍，金石可镂”一句与原文不一致。
[判断题] *对(正确答案)错11、下列词语中，加着重号字的注音不正确的一项是（）[单选题] *A、济南（jì）丧事（sāng）刮痧（shā）游目骋怀（chěng）(正确答案)B、私塾（shú）秩序（zhì）徘徊（pái）拥挤不堪（kān）C、旖旎（yǐ）淤泥（yū）吮吸（shǔn）面面相觑（qù）D、租赁（lìn）誊写（téng）打盹（dǔn）自惭形秽（huì）12、下列词语中，加着重号字的读音完全相同的一项是（）[单选题] *A、笑靥厌烦梦魇恹恹B、惊诧岔路刹那差劲(正确答案)C、元宵云霄销赃肖像D、蕴涵熨斗氤氲头晕13、1“看万山红遍，层林尽染，漫江碧透，百舸争流。
为什么特级、一级动火作业票的有效期规定为8h？？
为什么特级、一级动火作业票的有效期规定为8h？从哪个时间点开始算起作业期间中断的时间是否计算在8h 之内？
通常危险化学品企业多为连续化或间歇式生产工艺装置，采用倒班制进行生产作业，一个生产班次通常为 8h。
为减少因交接班等不稳定因素导致的作业环境和人员变化带来的作业风险，尽量将一次动火作业控制在一个生产班次范围中，因此规定特级、一级动火作业票的有效期为 8h，对有效期内未完成作业的应重新办理审批手续。
本标准提供的动火作业票样票中列出了“作业申请时间”“气体取样分析时间”和“动火作业实施时间”“审批时间”四个时间点，动火作业票的有效期应从动火作业实施时间（正式动火开始时间）开始算起。
作业期间可能存在的中断时间（如就餐时间等）应计算在8h 之内，因作业期间中断时间很难在作业票中准确记录。
创优作业八下英语
创优作业八下英语以下为您生成 20 个关于英语释义、短语、单词、用法和双语例句的内容，希望对您有所帮助：---1. **单词**：Accomplish- **释义**：完成；实现；达到- **用法**：accomplish sth. 完成某事- **短语**：accomplish a task 完成任务- **双语例句**：He accomplished his goal of becoming a doctor. 他实现了成为医生的目标。
2. **单词**：Beneficial- **释义**：有益的；有利的- **用法**：be beneficial to sb./sth. 对某人/某事有益- **短语**：beneficial effect 有益的效果- **双语例句**：Regular exercise is beneficial to your health. 经常锻炼对你的健康有益。
3. **单词**：Challenge- **释义**：挑战；艰巨任务- **用法**：face a challenge 面对挑战- **短语**：take up a challenge 接受挑战- **双语例句**：This job presents a big challenge for me. 这份工作对我来说是一个巨大的挑战。
4. **单词**：Convenient- **释义**：方便的；便利的- **用法**：It is convenient for sb. to do sth. 对某人来说做某事方便- **短语**：convenient location 便利的位置- **双语例句**：It's very convenient to go shopping by subway. 乘地铁去购物很方便。
5. **单词**：Demonstrate- **释义**：证明；展示；示威- **用法**：demonstrate sth. to sb. 向某人展示某物- **短语**：demonstrate one's ability 展示某人的能力- **双语例句**：The experiment demonstrated the theory. 实验证明了这个理论。
北京市朝阳区人大附中朝阳分校2021-2022学年八年级下学期限时作业数学试卷
2021-2022学年北京人大附中朝阳分校八年级（下）限时作业数学试卷（7）注意事项：1．答题前，考生务必在试题卷、答题卡规定位置填写本人准考证号、姓名等信息．考生要认真核对答题卡上粘贴的条形码的“准考证号、姓名”与考生本人准考证号、姓名是否一致．2．选择题每小题选出答案后，用2B 铅笔把答题卡上对应题目的答案标号涂黑，如需改动，用橡皮擦干净后，再选涂其他答案标号．非选择题答案用0.5 毫米黑色墨水签字笔在答题卡上相应位置书写作答，在试题卷上答题无效．3．作图可先使用2B 铅笔画出，确定后必须用0.5 毫米黑色墨水签字笔描黑．一、选择题（每题2分，共20分）1．已知一次函数y＝kx+b随着x的增大而减小，且kb＜0，则在直角坐标系内它的大致图象是（）A．B．C．D．2．点P（a，b）在函数y＝3x+2的图象上，则代数式6a﹣2b+1的值等于（）A．5B．3C．﹣3D．﹣13．一次函数y1＝kx+b与y2＝x+a的图象如图，则下列结论：①k＜0；②a＜0；③当x＜3时，y1＜y2正确的个数是（）A．0B．1C．2D．34．用图象法解方程组时，如图中正确的是（）A．B．C．D．5．对于一次函数y＝kx+k﹣1（k≠0），下列叙述正确的是（）A．当0＜k＜1时，图象经过第一、二、三象限B．图象一定经过点（﹣1，﹣2）C．当k＞0时，y随x的增大而减小D．当k＜1时，图象一定交于y轴的负半轴6．无论m为何实数，直线y＝x+2m与y＝﹣x+4的交点不可能在（）A．第一象限B．第二象限C．第三象限D．第四象限7．如图，两直线y1＝kx+b和y2＝bx+k在同一坐标系内图象的位置可能是（）A．B．C．D．8．如图，动点P在边长为2的等边ABC的边上．它从点A出发，沿A→C→B→A的方向以每秒1个单位长度的速度运动，如果点P的运动时间为t秒，点P与点C之间的距离记为y，那么y与t之间的函数关系用图象表示大致是（）A．B．C．D．9．如图，平面直角坐标系xOy中，点A的坐标为（9，6），AB⊥y轴，垂足为B，点P从原点O出发向x轴正方向运动，同时，点Q从点A出发向点B运动，当点Q到达点B 时，点P，Q同时停止运动，若点P与点Q的速度之比为1：2，则下列说法正确的是（）A．线段PQ始终经过点（2，3）B．线段PQ始终经过点（3，2）C．线段PQ始终经过点（2，2）D．线段PQ不可能始终经过某一个定点10．为了缅怀先烈，继承遗志，某中学初二年级同学于4月初进行“清明雁栖，忆先烈功垂不朽”的定向越野活动．每个小组需要在点A出发，跑步到点B打卡（每小组打卡时间为1分钟），然后跑步到C点，……最后到达终点（假设点A，点B，点C在一条直线上，且在行进过程中，每个小组跑步速度是不变的）．“文艺组”最先出发，过一段时间后，“方程组”开始出发，两个小组恰好同时到达点C．若“方程组”出发时间为x （单位：分钟），在点A与点C之间的行进过程中，“文艺组”和“方程组”之间的距离为y（单位：米），它们的函数图象如图：则下面判断不正确的是（）A．当x＝2时，“文艺组”恰好到达B点B．“文艺组”的速度为150米/分钟，“方程组”的速度为200米/分钟他们从A点出发的时间间隔为2分钟C．图中M点表示“方程组”在B点打卡结束，开始向C点出发D．出发点A到打卡点B的距离是600米，打卡点B到点C的距离是800米二、填空题：（每空3分，共54分）11．已知函数y＝（k+1）x+k2﹣1，若它是一次函数，则k；若它是正比例函数，则k．12．已知直线l1：y＝2x+4，将l1向下平移2个单位得到的函数解析式为，将l1向左平移3个单位得到的函数解析式为；l1关于x轴对称的函数解析式为．13．如图，若直线y＝k1x+b1与直线y＝k2x+b2相交于点A，则方程组解是．14．已知一次函数y＝mx+n中，函数值y与自变量x的部分对应值如表：x……﹣2﹣1012……y……108642……则关于x的不等式mx+n＞0的解集是．15．点A为直线y＝﹣2x+2上一点，点A到两坐标轴距离相等，则点A的坐标为．16．在平面直角坐标系中，已知A（﹣2，3），B（4，3）；直线y＝kx﹣k（k≠0）与线段AB有交点，则k的取值范围为．17．已知一次函数y＝kx﹣6k+3，无论k取何值，图象总过一定点，此定点坐标为．18．如果一次函数y＝（m+1）x+（m﹣2）的图象不经过第二象限，则m取值范围是．19．如图，在平面直角坐标系xOy中，矩形ABCD的边AD＝3，A（0.5，0），B（2，0）．（1）若直线y＝kx+b经过B，D两点．则直线y＝kx+b的解析式，若将直线y ＝kx+b平移，使它与矩形有公共点，则b的取值范围为；（2）若一次函数y＝kx+b经过（0，1），且与矩形有两个交点，则k的取值范围为．20．已知一次函数的图象过点（0，3），且与两坐标轴围成的三角形的面积为3，则一次函数的表达式为．21．如图，直线y＝﹣x与y＝ax+3a（a≠0）的交点的横坐标为﹣1.5，则关于x的不等式﹣x＞ax+3a＞0的整数解为．22．已知y＝y1+y2，其中与x成正比例，y2与x﹣2成正比例，且当x＝﹣1时，y＝2；当x ＝2时，y＝5，则y与x的函数关系式为．23．在平面直角坐标系xOy中，一次函数y＝kx+b（k≠0）的图象由y＝x的图象平移得到，且经过点（0，﹣1）．当x＞1时，对于x的每一个值，函数y＝﹣x+m的值小于一次函数y ＝kx +b 的值，则m 的取值范围 ．三、解答题：24．如图，一次函数y ＝﹣x +5的图象l 1分别与x 轴，y 轴交于A ，B 两点，正比例函数的图象l 2与l 1交于点C （m ，）．（1）求l 2的解析式；（2）S △AOC ﹣S △BOC 的值为 ；（3）一次函数y ＝kx +1的图象为l 3且l 1，l 2，l 3可以围成三角形，直接写出k 的取值范围 ．25．探究活动：探究函数y ＝x 的图象与性质．下面是小左的探究过程，请补充完整；（1）函数y ＝x 的自变量x 的取值范围是 ．（2）如表是y 与x 的几组对应值．x﹣4 ﹣ ﹣3 ﹣2 ﹣1 0 1 2 … y 0 m ﹣3﹣2﹣ 0 2 …直接写出m 的值是 ；（3）如图，在平面直角坐标系xOy 中，描出了以上表中各对对应值为坐标的点，请你对照表格补全图中的点，然后画出该函数的图象；并写出该函数的一条性质：解决问题：（4）若关于x的不等式kx+b＞x的解集是﹣3＜x＜1，则k﹣b的值为．26．现代互联网技术的广泛应用，催生了快递行业的高速发展，小明计划给朋友快递一部分物品，经了解甲、乙两家快递公司比较合适，甲公司表示：快递物品不超过1千克的，收费12元；超过1千克，超过的部分按单价每千克2元收费．乙公司表示：快递物品不超过1千克的，收费10元；超过1千克，超过的部分按单价每千克4元收费．例如：小明要快递1.4千克的物品，选甲公司需付费12.8元，选乙公司需付费11.6元．设小明快递物品x千克．（1）请分别直接写出甲、乙两家快递公司快递该物品的费用y（元）与x（千克）之间的函数关系式；（2）如果只考虑价格，不考虑其它因素，小明选择哪家快递公司更省钱？27．已知一次函数y＝kx+b（k，b为常数，且k≠0）的图象过点（3，2）和（0，﹣4）．交x轴于A，交y轴于B．（1）这个函数的解析式为；（2）若点（a﹣5，3a）在函数图象上，则a＝；（3）规定横、纵坐标都为整数的点为整点，若此一次函数图象与y＝x的图象及y轴围成的区域（不含边界）称为区域W，则：①区域W中整点的个数为；②把这个一次函数图象至少向上平移个单位，则使得区域W中的整点个数为0．四、附加题：（20分）28．一次函数y＝﹣x+2的图象分别与x、y轴交于点A、B．（1）直接写出△AOB的面积为；（2）点P（x，y）是坐标平面内的点，且满足△APB的面积是△AOB的面积的3倍，直接写出y与x的函数关系式；（3）若点C是线段AB的中点，点P在正比例函数y＝﹣x的图象上，设以点A、C、O、P为顶点的四边形的面积为S，当8≤S≤10时，求点P的纵坐标的取值范围．29．在平面直角坐标系xOy中，对于任意P（a，b）和直线y＝ax+b，我们称直线y＝ax+b 为点P（a，b）的伴随直线，反之称点P（a，b）为直线y＝ax+b的伴随点．特别的直线y＝b（b为常数）的伴随点为（0，b）．如图，已知△ABC三个顶点的坐标分别为（﹣2，﹣1），（1，5），（3，﹣1）．（1）点A（﹣2，﹣1）的伴随直线的解析式为；（请直接写出答案）（2）若直线AB的伴随点是点D，直线BC的伴随点是点E，点F为x轴上的动点，当△DEF的周长最小时，求点F的坐标；（3）点P是折线A﹣B﹣C上的动点（包括端点A，C），若直线l是点P的伴随直线，当直线l与△ABC有且仅有两个公共点时，请直接写出点P的横坐标的取值范围．。
2019-2020新人教版物理必修1 课时分层作业8 重力与弹力
课时分层作业(八)重力与弹力[合格基础练](时间：15分钟分值：50分)一、选择题(本题共6小题，每小题6分，共36分)1．(多选)关于弹力，下列说法正确的是()A．静止在水平面上的物体所受的重力就是它对水平面的压力B．压力、支持力、绳的拉力都属于弹力C．弹力的大小与物体的形变程度有关，在弹性限度内形变程度越大，弹力越大D．弹力的方向总是与施力物体恢复形变的方向相同BCD[静止在水平面上的物体受到的重力是地球的吸引产生的，而压力是由于形变引起的，二力不是同一种力，选项A错误；压力、支持力、绳子中的拉力均是由于形变而引起的，都属于弹力，选项B正确；弹力的大小与物体的形变程度有关，在弹性限度内形变程度越大，弹力越大，选项C正确；弹力的方向总是与施力物体恢复形变的方向相同，选项D正确．]2．下列各图中A、B两球之间不存在弹力的是(所有接触面均光滑)()A BC DB[A图中若两球间无弹力则小球将向凹面的底部运动，A、B间有弹力，选项A错误；B图中两球间若有弹力则小球将向两边运动，A、B间无弹力，选项B正确；C图中两球间若无弹力则小球A将向右下运动，A、B间有弹力，选项C错误；D图中两球间若无弹力则小球A将向下运动，A、B间有弹力，选项D错误．]3．如图所示，“马踏飞燕”是汉代艺术家高超的艺术技巧的结晶，是我国古代青铜艺术的稀世之宝，骏马之所以能用一只蹄稳稳地踏在飞燕上，是因为()A．马是空心的B．马蹄大C．马的重心在飞燕上D．马的重心位置和飞燕在一条竖直线上D[骏马之所以能用一只蹄稳稳地踏在飞燕上，是因为飞燕对马的支持力和马的重力在一条竖直线上，选项A、B、C错误，D正确．]4．如图所示，一个空心均匀球壳里面注满水，空心球壳的正下方有一小孔，在水由小孔慢慢流出的过程中，空心球壳和水的总重心将会()A．一直下降B．一直上升C．先升高后降低D．先降低后升高D[当注满水时，球壳和水的重心均在球心，故它们的总重心在球心，随着水的流出，球壳的重心虽然仍在球心，但水的重心逐渐下降．开始一段时间内，球壳内剩余的水较多，随着水的重心下降，球壳和水的总重心也下降；后一段时间内，球壳内剩余的水较少，随着水的重心下降，球壳和水的总重心升高，剩余的水越少，总重心越靠近球心，最后水流完时，重心又回到球心．故球壳和水的总重心先降低后升高，选项D正确．]5．如图所示，轻弹簧的劲度系数为k，小球的质量为m，平衡时小球在A 位置．今用力F将小球向下压缩x至新的平衡位置B，则此时弹簧的弹力大小为()A．kx B．mg＋kxC ．FD ．mg －kxB [当弹簧处于平衡位置A 时：设弹簧的形变量为x 1，由胡克定律得：mg＝kx 1，解得x 1＝mg k .将小球向下压缩x 至B 位置时，弹簧的形变量x 2＝mg k ＋x .由胡克定律得：F 弹＝kx 2，即：F 弹＝k ×⎝ ⎛⎭⎪⎫mg k ＋x ＝mg ＋kx ，故选B.] 6．如图所示的装置中，小球的质量均相同，弹簧和细线的质量均不计，一切摩擦忽略不计，平衡时各弹簧的弹力分别为F 1、F 2、F 3，其大小关系是( )A ．F 1＝F 2＝F 3B ．F 1＝F 2<F 3C ．F 1＝F 3>F 2D ．F 3>F 1>F 2A [对小球受力分析，左边装置中下面小球受到重力mg 和弹簧的弹力F 1作用，根据平衡条件可知，F 1＝mg ；其他两个装置中弹簧弹力等于细线上拉力，对小球受力分析，根据平衡条件可知细线上拉力等于小球重力，则有F 2＝F 3＝mg .因此，F 1＝F 2＝F 3＝mg ，故选项A 正确．]二、非选择题(14分)7．由实验测得某弹簧的长度L 和弹力F 的关系如图所示，求：(1)该弹簧的原长为多少？(2)该弹簧的劲度系数为多少？[解析] (1)弹簧不产生弹力时的长度等于原长，由图可知该弹簧的原长为L 0＝15 cm.(2)据F ＝kx 得劲度系数k ＝F x ＝ΔF ΔL，由图线可知，该弹簧伸长ΔL ＝25 cm －15 cm ＝10 cm 时，弹力ΔF ＝50 N ．所以，k ＝ΔF ΔL ＝5010×10－2N/m ＝500 N/m. [答案] (1)15 cm (2)500 N/m[等级过关练](时间：25分钟分值：50分)一、选择题(本题共4小题，每小题6分，共24分)1．一个实验小组在“探究弹力和弹簧伸长的关系”的实验中，使用两条不同的轻质弹簧a和b，得到弹力与弹簧长度的图像如图所示，下列表述正确的是()A．a的原长比b的长B．a的劲度系数比b的大C．a的劲度系数比b的小D．测得的弹力与弹簧的长度成正比B[在题图中图线在横轴上的截距表示弹簧的原长，故b的原长比a的长，A错误．图像的斜率表示弹簧的劲度系数k，故a的劲度系数比b的大，B正确，C错误．弹簧的弹力满足胡克定律，弹力与弹簧的形变量成正比，故D错误．] 2．(多选)如图所示，小球C置于光滑的半球形凹槽B内，B放在长木板A 上，整个装置处于静止状态．现缓慢减小A的倾角θ，下列说法正确的是()A．C受到的支持力逐渐变大B．C受到的支持力大小不变C．C对B的压力逐渐变大D．C对B的压力大小不变BD[小球C受支持力和自身重力两个力的作用处于平衡状态，重力与支持力二力平衡，所以小球所受的支持力大小始终等于重力的大小，小球对B的压力等于小球所受的支持力也保持不变，选项B、D正确．]3．(多选)如图所示，两辆车在以相同的速度做匀速运动，根据图中所给信息和所学知识你可以得出的结论是()A．物体各部分都受重力作用，但可以认为物体各部分所受重力集中于一点B．重力的方向总是垂直向下的C．物体重心的位置与物体形状和质量分布有关D．力是使物体运动的原因AC[物体各部分都受重力作用，但可以认为物体各部分所受重力集中于一点，这个点就是物体的重心，重力的方向总是和水平面垂直，是竖直向下而不是垂直向下，所以A正确，B错误；从题图中可以看出，汽车(包括货物)的形状和质量分布发生变化，重心的位置就发生变化，故C正确；力不是使物体运动的原因而是改变物体运动状态的原因，所以D错误．]4．缓冲装置可抽象成如图所示的简单模型，图中A、B为原长相等、劲度系数分别为k1、k2(k1≠k2)的两个不同的轻质弹簧．下列表述正确的是()A．装置的缓冲效果与两弹簧的劲度系数无关B．垫片向右移动稳定后，两弹簧产生的弹力之比F1∶F2＝k1∶k2C．垫片向右移动稳定后，两弹簧的长度之比l1∶l2＝k2∶k1D．垫片向右移动稳定后，两弹簧的压缩量之比x1∶x2＝k2∶k1D[装置的缓冲效果与两弹簧的劲度系数有关，劲度系数大的缓冲效果好，故A错误；当垫片向右移动稳定后，两弹簧均被压缩，两弹簧串联，弹力大小相等，故B错误；弹力大小相等，根据胡克定律知，压缩量之比为x1∶x2＝k2∶k1，而此时弹簧的长度为原长减去压缩量，所以两弹簧的长度之比l1∶l2≠k2∶k1，故C错误，D正确．]二、非选择题(本题共2小题，共26分)5．(12分)一根竖直悬挂的轻质弹簧，下端挂上2 N的物体时，其伸长量为2 cm.一研究小组用它探究弹簧弹力和伸长量的关系，在弹簧弹性限度内，测出悬挂不同重物时，弹簧弹力和弹簧伸长量的关系，画出了如图所示的图像．该图像纵轴表示弹力F，单位为牛顿，图线为反比例关系的双曲线，因绘图同学的疏忽，忘记在横轴标出关于弹簧伸长量x的表达形式，请你帮助他写出横轴所表示的弹簧伸长量x的表达形式________．图像中采用国际单位制，对应纵坐标为 4 N的横坐标的坐标值应为________．[解析]弹簧下端挂2 N的物体时，弹簧的伸长量为2 cm，则由胡克定律F ＝kx得k＝100 N/m，即F＝100x(N)①设图像中的横坐标为a，则图线表达式为F＝k′a(k′为反比例函数的比例系数)，由图像可知，当a＝5时，F＝20，所以k′＝100即F＝100a(N)②由①②可得a＝1x，故横轴表示的是1x，单位是m－1.由F＝100a知，当F＝4 N时，a＝25(m－1)．[答案]1x256.(14分)如图所示，两木块的质量分别为m1和m2，两轻质弹簧的劲度系数分别为k1和k2.上面的木块压在上面的弹簧上(但不拴接)，整个系统处于平衡状态．现缓慢向上提上面的木块，直到它刚离开上面的弹簧．求上述过程中下面的木块移动的距离．[解析] 未提木块之前，下面弹簧上的弹力F 1＝(m 1＋m 2)g ，根据胡克定律得下面弹簧的压缩量x 2＝(m 1＋m 2)g k 2，当上面的木块被提离弹簧时，下面弹簧上的弹力F 2＝m 2g ，下面弹簧的压缩量x 2′＝m 2g k 2，所以下面木块向上移动的距离Δx ＝x 2－x 2′＝m 1g k 2. [答案]m 1g k 2。
八年级语文限时作业苏教版
河失镇中心初中初二语文限时作业姓名一、选择题1.下列标点符号使用正确的一项是 ( )A.这一夜，只觉泉鸣不绝于耳，不知是梦，是醒？B.在黄山，你可以结识许多“天国仙友”，又可参观一个奇特的“动物世界。
”C.“吓！”声音很严厉，左手的食指强硬地指出：“这是中央银行的，你们不要，可是要想吃官司？”D.什么叫成功？顺手拿过来一本“现代汉语词典”，上面写道：“成功，获得预期的结果。
”2．下列标点符号使用有错误的一项是()A．漫天飞雪的冬天，才会思念春天的绿意盈盈；七月流火的夏日，才会思念冬天的白雪皑皑。
B．春天到了，桃花啊，梨花啊，杏花啊，都赶趟儿似的，开得漫山遍野。
C．要在城东修建立交桥的消息传出后，许多人非常关心这座桥怎么建，那里的树怎么办？D、远离了车流、霓虹灯和高楼的我们，竟情不自禁地趴在地上，大声喊着：“我回来了！”3.下列各句中加点的成语使用恰当．．的一项是（）A.这两位进城打工的农民遭到保安人员的非法拘押和刑讯逼供，他们在被毒打后忍无可忍．．．．，不得不承认偷了商场的物品。
B.对于房价在全国略胜一筹．．．．的上海来说，经济适用房的低价无疑对工薪阶层具有巨大的吸引力。
C.这个派出所的干警们措施定得扎实，工作做得踏实，几年来没有发生过一起大案，连小偷小摸的事也凤毛麟角．．．．，当地群众十分满意。
D.随着经济的发展，这座沉寂了许多年的边陲小城，一到夜晚也会灯红酒绿．．．．，热闹非凡，呈现一派繁华景象。
4．下列各句中，加点的成语使用恰当的一项是()A．我国西部地区如能用好政策，更新观念，大胆创新，那么迅速赶上沿海发达地区，甚至青出于蓝，是完全可能的。
B．五一期间，通往望海楼公园的南山寺路上人流如潮，接踵而至，形成一道亮丽的风景线。
C．上海姑娘金晶在法国奋勇保护火炬的事迹传到家乡后，受到家乡人民的交口称赞，弄得满城风雨。
D．十九世纪俄国批判现实主义作家契诃夫的短篇小说《变色龙》，构思新颖，匠心独运，值得一读。
限时训练8 跨膜运输方式
任丘一中北校区生物限时作业（8）物质跨膜运输的方式命题人：张志静审题人：张莉限时：30分钟使用日期：11.10一．选择题（每题2分共24分）1．属于主动运输的是A．葡萄糖进入红细胞B．CO2由静脉血进入肺泡内C．原尿中的葡萄糖进入肾小管上皮细胞D．水分子进出细胞2．下列物质中以相同方式通过细胞膜的是A．甘油和二氧化碳B．NH4+和水C．氨基酸和水D．葡萄糖和糖原3．下列物质进出细胞的过程与线粒体密切相关的是①酒精被胃黏膜吸收②细胞与内环境进行气体交换③神经细胞吸收K＋④小肠绒毛上皮细胞吸收氨基酸⑤红细胞吸收葡萄糖A．①②⑤B．③④⑤C．③④D．①③④4．如图所示小肠绒毛上皮细胞中的细胞膜对不同物质的转运(每种转运的方向由箭头表明，黑点的数量代表每种物质的浓度)，下列叙述正确的是A．a物质可能是氧气，b物质可能是葡萄糖B．a物质可能是水，b物质可能是甘油C．a物质可能是胆固醇，b物质可能是氧气D．a物质可能是葡萄糖，b物质可能是氨基酸5．甲(0)乙(●)两种物质在细胞膜两侧的分布情况如图(颗粒的多少表示浓度的高低)，在进行跨膜运输时，下列说法正确的是A．甲进入细胞一定需要能量B．甲运出细胞一定不需要能量C．乙进入细胞一定有载体蛋白的参与D．乙运出细胞一定有载体蛋白的参与6．神经细胞间可以通过一种特殊的介质来传递信息，含有传递分子的囊泡与神经细胞内的质膜融合之后再打开，将传递分子释放到神经细胞之外，这属于A．主动运输B．协助扩散C．胞吐D．胞吞7．甲、乙两种物质分别依赖自由扩散和协助扩散进入细胞，如果以人工合成的无蛋白质磷脂双分子膜代替细胞膜，并维持其他条件不变，则A ．甲运输被促进B ．乙运输被促进C ．甲运输被抑制D ．乙运输被抑制8．实验发现，葡萄糖进入红细胞时，如果使用药物限制蛋白质的活性，则葡萄糖的运输速率迅速下降，如果减少能量的供应，却对运输没有影响。
由此推断葡萄糖进入红细胞的方式是A ．自由扩散B ．主动运输C ．协助扩散D ．逆浓度梯度运输9．如图不能够表达的生理过程是A ．肾小管细胞排出K ＋B ．胰岛细胞分泌胰岛素C ．浆细胞分泌抗体D ．肠腺细胞分泌肠液10．能够反映细胞膜具有选择透过性功能特点的实例有（ ）①白细胞吞噬病菌 ②细胞膜外K ＋的浓度远低于膜内 ③变形虫的变形运动④唾液腺细胞分泌唾液淀粉酶⑤海带细胞内的I －浓度远远高于海水中的I －浓度A ．①③④B ．②④⑤C ．①③D ．②⑤ 11．将两种海绵动物的细胞分散成单个的细胞，再进行混合培养，发现只有同种的细胞才能结合，其原因是两种海绵细胞A ．表面糖蛋白的成分不同B ．脂质成分不同C ．细胞膜的流动性不一样D ．细胞膜的选择透过性不同12．已知某种物质通过细胞膜的方式如右图所示，则下列哪种物质的运输方式与图示不同A ．Na ＋B ．KC ．氨基酸D ．氧气二、非选择题（每空2分共30分）11．右图为物质出入细胞膜的示意图，请据图回答：（1）A代表分子；B代表；D代表。
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限时作业8 (必修2 Unit 3)Ⅰ.完成句子1.他沿着公路徘徊, 不知道该干什么, 也不知道该去哪里。
He the road, not knowing what to do and where to go. 2.大家都知道, 随时可能出现事故。
Accidents , which is known to us all.3.他是一个能恰当处理各种局面的人。
He is a person who can all situations.4.我不知道你为什么这么关注, 这毕竟不是你的问题。
I don’t know why you’re ;it isn’t your problem .5.从现在起, 你可以独自工作了。
, you can work .Ⅱ.语法和词汇知识1.Cellphones are now widely used, possible for us to talk to anyone from almost anywhere.A.make itB.to make itC.malingD.making it2.As is known to us all, failure usually laziness while diligence cansuccess.A.results from;lie inB.results in;result fromC.leads to;lie inD.results from;result in3.Despite the fact that her father did not like the young businessman, she married him .A.somewhatB.anyhowC.anywhereD.instead4.—You’re quite free now, I think.—, I have tons of things to do.A.In other wordsB.On the contraryC.As a resultD.What’s more5.The policeman the children to cross the road when the traffic lights turned green.A.letB.madeC.signaledD.called6.Months ago we sailed ten thousand miles across this open sea, which the Pacific, and we met no storms.A.was calledB.is calledC.had better calledD.has been called7.Once new difficulties in your new work, it’s always important to use your brains.A.riseB.causeC.raiseD.arise8.The new American president’s winning speech is a that major changes will be on the way.A.warningB.goalC.signalD.suggestion9. “Do you know when Obama ?” he asked me.A.came into officeB.came into forceC.came into beingD.came into service10.So severe was the earthquake the central government had to start the first degree emergency plan.A.andB.thereforeC.thatD.asst summer I took a course on poisonous gases.A.how to deal withB.what to deal withC.how to handle withD.what to cope with12.In some countries poisonous snakes can be used to the jewels in shops at night.A.watch overB.watch outC.look outD.take over13.—Since you like the fur coat so much, why not buy it?—Well, I can’t afford coat.A.that expensive aB.that an expensiveC.so expensiveD.such expensive14.The problem facing us is so serious that we have to it first.A.take interestB.deal withC.make withD.work out15.—Do you mind if I borrow your bicycle?—A.How come?B.Take your time.C.Yes, go on.D.No, help yourself.Ⅲ.完形填空1.Four days ago, I was taking a taxi.On the way, I just had the 1 stop at a store to buy something.A woman 2 me to let her hitchhike.I 3 and picked this woman up.I thought she was too fat;she 4 about 120 kg.But she was very sweet and kind-hearted, so I didn’t 5 .She was talking to me 6 while going back to her place about how she got everything for her 7 .So I thought to myself she must have a happy family.But nothing special 8 yet.I went to her apartment 9 she needed help getting all the things she got to her place.I just helped her out and while I was 10 the stuff inside her house, I 11 that her husband walked in from the back of the apartment.So she was talking to him in her 12 voice, “Honey, I got you this;Honey, I got you that.” But what I came to notice was that her husband was 13 .And then I looked close to how they were together and I knew for that moment I was seeing “TRUE 14 ”.They cared for each other so 15 and what they looked like was not 16 at all.I was just deeply 17 by the true love between them.Sometimes I think about going back to the apartment and tell them what I 18 in them and to thank them for sharing their 19 with me, even it is for a few 20 .I like this couple care about each other;it is a very happy and romantic thing.1.A.stranger B.waiter C.passenger D.driver2.A.reminded B.allowed C.asked D.helped3.A.nodded B.promised C.hesitated D.explained4.A.carried B.weighedC.supportedD.lifted5.A.remember B.mindC.worryD.leave6.A.gladly B.nervously C.slowly D.calmly7.A.friend B.husbandC.daughterD.neighbour8.A.stayed B.continuedC.stoppedD.happened9.A.unless B.if C.because D.although10.A.moving B.searchingC.arrangingD.observing11.A.imaged B.noticedC.believedD.expected12.A.polite B.tired C.high D.sweet13.A.painful B.foolish C.blind D.ill14.A.LOVE B.FRIENDSHIPC.JUDGEMENTD.STORY15.A.frequently B.deeplyC.thankfullyD.quietlyeful B.clearC.secretD.important17.A.encouraged B.surprisedC.touchedD.shocked18.A.hid B.built C.put D.saw19.A.lives B.troubles C.food D.memory20.A.days B.hoursC.minutesD.secondsⅣ.七选五阅读理解1.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。
选项中有两项为多余选项。
1 Being angry doesn’t really solve much, but what people do when they feel angry is important.The goal is to calm down and try to solve what is bothering you.This is hard for some kids and adults, too.Instead of calming down, some kids might keep getting more and more upset until they explode like a volcano!2 Their anger might be so strong that they lose control of their temper.They may act in ways unacceptable and hurtful.People may say that someone has trouble controlling their temper. 3Some kids might get so angry that they scream at their parents, break something, or even worse, hit their brothers or sisters. 4 However, it’s not OK for a kid to do any of those things.Kids don’t want to act in this way, but sometimes angry feelings can be hard to manage.So what to do?Well, the good news is that kids don’t just have to keep making the same mistakes over and over again. 5 Imagine your temper as a puppy inside you that needs some training.The puppy is not bad—it will probably turn out to be a great dog.It just needs to learn some rules because, right now, that puppy is causing some problems for you.A.You can train you temper.B.You don’t want to cause trouble.C.Kids should be allowed to express their feelings, even angry ones.D.Everybody gets angry sometimes.E.In fact, they usually mean that a kid behaves badly when feeling angry.F.Instead of thinking of the person you’re angry with, think of something else.G.Some kids get angry more often or more easily than some other kids.Ⅴ.短文改错1.One day I left my school and walked to home through the zoo.I was walking along while I saw a lot of people running about me.“Run for your life!”they shouted for me.I didn’t know what was happening and waiting for a minute.Suddenly I saw a tiger that has escaped from the cage.I stood still,so I was too frightening to move.I could do nothing but cry,“Help!Help!”“What the matter with you?”my mother asked.I woke up and realized that I had had a dream.“How a funny dream!”I thought.##答案：Ⅰ.完成句子1.was wandering up and down2.arise at any time3.deal properly with4.so concerned;after all5.From now on;on your ownⅡ.语法和词汇知识1.D making ...为分词短语作状语, 表结果;it作形式宾语, 代指后面的不定式to talk to ...。