随堂练答案
随堂练化学九年级试卷答案
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随堂练化学九年级试卷答案专业课原理概述部分一、选择题(每题1分,共5分)1. 下列哪种物质在空气中燃烧时会产生淡蓝色火焰?A. 硫磺B. 木炭C. 铁丝D. 氢气2. 下列哪种溶液的pH值最小?A. 醋酸B. 氢氧化钠C. 硫酸钠D. 水3. 下列哪种气体是无色无味的?A. 氧气B. 二氧化硫C. 氨气D. 氯气4. 下列哪种反应属于氧化还原反应?A. 酸碱中和反应B. 置换反应C. 分解反应D. 合成反应5. 下列哪种物质是纯净物?A. 食盐B. 空气C. 水溶液D. 碳酸氢钠二、判断题(每题1分,共5分)1. 化学变化中,元素的种类和数量保持不变。
()2. 氢氧化钠和盐酸反应氯化钠和水,这是一种氧化还原反应。
()3. 酸性溶液的pH值小于7。
()4. 碳酸钙在高温下分解成氧化钙和二氧化碳。
()5. 金属活动性顺序中,银的活动性大于铜。
()三、填空题(每题1分,共5分)1. 化学反应的基本类型有:化合反应、分解反应、置换反应和______反应。
2. 在空气中,铁丝不能燃烧,但铁的某种氧化物可以燃烧,这种氧化物是______。
3. 用______溶液可以检验二氧化碳气体。
4. 稀硫酸和锌反应硫酸锌和______。
5. 氢氧化钠溶液的______值大于7。
四、简答题(每题2分,共10分)1. 简述质量守恒定律的内容。
2. 简述实验室制取氧气的原理。
3. 简述酸碱中和反应的特点。
4. 简述水的电解实验现象及结论。
5. 简述空气中氧气的体积分数。
五、应用题(每题2分,共10分)1. 氢气在氧气中燃烧水,写出反应的化学方程式。
2. 硫酸和氢氧化钠反应硫酸钠和水,写出反应的化学方程式。
3. 铁丝在氧气中燃烧四氧化三铁,写出反应的化学方程式。
4. 氢氧化钙和碳酸钠反应碳酸钙沉淀和氢氧化钠,写出反应的化学方程式。
5. 氯化铜和氢氧化钠反应氢氧化铜沉淀和氯化钠,写出反应的化学方程式。
六、分析题(每题5分,共10分)1. 分析下列化学反应的类型:2H2 + O2 → 2H2O2. 分析下列化学反应的类型:Fe + CuSO4 → FeSO4 + Cu七、实践操作题(每题5分,共10分)1. 设计一个实验方案,验证质量守恒定律。
物理随堂练九年级答案江苏版
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物理随堂练九年级答案江苏版一、选择题:1、物体相对于平动叫做?A、相对运动B、运动C、静止D、全部答案:A、相对运动2、由接地线连接到家用电器中的一端叫什么?A、相位B、火线C、接地D、中性线答案:C、接地线3、物体所受到的向下的速度变大的原因是什么?A、重力加速度B、牛顿第三定律C、运动定律D、牛顿第二定律答案:A、重力加速度4、牛顿的运动定律的第三条是什么?A、劳动定律B、物体的受力定律C、物体的速度变化D、物体运动定律答案:B、物体的受力定律5、物体运动时所受力的作用方向是?A、由抛物线正方向而行B、由抛物线逆方向而行C、由物体运动方向而行D、由运动物体垂直方向而行答案:C、由物体运动方向而行二、填空题:6、物体的动量的大小由它的_________________和___________________确定。
A、质量B、速度答案: A、质量 B、速度7、使用燃烧物质发生反应时,反应物所释放的能量称为___________________能量。
A、化学答案:A、化学8、牛顿第二定律表明,受到__________________的物体将做_______________运动。
A、外力B、匀变答案:A、外力 B、匀变三、解答题:9、请解释下面句子的意思:假设A物体受力,B物体受力,它们受到相同的合力,A物体的动量变化量大于B物体的动量变化量,最后可以得出结论什么?答:当A物体和B物体受到相同的合力作用,但A物体动量变化量大于B物体动量变化量时,最终可以得出结论:A物体的质量大于B 物体的质量,或者A物体运动速度大于B物体运动速度。
随堂练习册及答案高中物理
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随堂练习册及答案高中物理### 高中物理随堂练习册及答案#### 第一章:力学基础##### 练习一:牛顿运动定律问题1:一个物体的质量为5kg,受到一个水平方向的力F=20N,求物体的加速度。
解答:根据牛顿第二定律,\( F = ma \),其中\( F \)是作用力,\( m \)是物体的质量,\( a \)是加速度。
代入已知数值,\( a =\frac{F}{m} = \frac{20}{5} = 4 \) m/s²。
问题2:已知一个物体在水平面上以初速度v₀=10m/s开始滑行,摩擦系数μ=0.2,求物体滑行的最大距离。
解答:首先,根据牛顿第二定律,摩擦力\( F_{摩擦} = μmg \),其中\( g \)是重力加速度,取9.8m/s²。
摩擦力\( F_{摩擦} = 0.2 \times 5 \times 9.8 = 9.8N \)。
由于摩擦力是阻力,物体最终会停止。
使用动能定理,\( \frac{1}{2}mv₀² = F_{摩擦}d \),解得\( d =\frac{v₀²}{2μg} = \frac{10²}{2 \times 0.2 \times 9.8} = 25m \)。
##### 练习二:能量守恒定律问题1:一个质量为2kg的物体从高度10m处自由落下,忽略空气阻力,求物体落地时的动能。
解答:根据能量守恒定律,物体的势能转换为动能。
势能\( E_p = mgh \),动能\( E_k = \frac{1}{2}mv² \)。
落地时,\( E_p = E_k \)。
代入数值,\( 2 \times 9.8 \times 10 = \frac{1}{2} \times 2\times v² \),解得\( v = 14.14m/s \),动能\( E_k =\frac{1}{2} \times 2 \times 14.14² = 100J \)。
随堂练习【含答案】
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模块5 随堂练习UNIT 1用动词不定式完成句子并说出其在句子中所作的成分:()1. The teacher asked us ____________________________ (努力学习). ()2. (学好英语) ________________________________ is not easy.()3. I saw him ______________________________________ (出去了). ()4. He wants ____________________________________ (成为医生). ()5. We don’t know ____________________________ (下一步怎么做). ()6. Her wish is _________________________________ (跟我交朋友). ()7. She came __________________________________ (看她的父亲). ()8. It’s good ____________________________________ (帮助别人). ()9. I have _________________________________________ (没事做). ()10. We heard her ___________________________ (在房间了唱歌). II..阅读理解:1) Read this advertisement and answer the following questions.1. On Sunday, the zoo opens at ______.A.10:00 in the morningB 8:00 in the morningC. 8:00 in the afternoon2. The zoo opens ____ days a week.A. twoB. fiveC. seven3. If(如果)you are 13 years old, how much do you pay(支付)to go to the zoo?A. 3 dollarsB. 6 dollarsC. Free4. Kate is twelve, and his little sister is 6, they have to pay ______ to go to the zoo.A. 9 dollarsB. 11 dollarsC. 3 dollars5. If you are fourteen and your brother is seven, how much do you pay for the trainride?A. 2 dollars.B. 4 dollars.C. 6 dollars.2) “You are welcome to have dinner with me on Sunday.” said John. “But I don’t know where your house is.” said Henry. “It’s easy. You get off the bus. Then you cross the road. You take the first on the left. You walk for five minutes. Then you come to a big tree. You take the second on the right after the tree. About a hundred metres down this road there is a big red house, you go past the big house, and after about five hundred metres, you’ll see a small yellow house beside a little tree. Open the door with your foot.” “With my foot?” said Henry. “Why, yes.” said John, “Well, you won’t come to my house empty handed, will you?”1. From the story we know that John asked Henry ______.A. to go to the cinema togetherB. to have supper with himC. to go to the bus stopD. to go to the big red house2. “You take the first on the left” means you ______.A. go ahead on the leftB. take the first bus on the leftC. take the first road on the leftD. must buy something first3. How far was it from the big tree to the big red house? It was ______.A. about one hundred metres awayB. five minutes’ walkC. about five hundred feetD. a hundred minutes’ ride4. Where was John’s house? It was ______.A. on the right after the big treeB. a big red houseC. a small yellow houseD. beside a little tree5. Why did John ask Henry to open the door with his foot? Because Henry ______.A. had no handsB. had nothing in his handsC. was afraid to open the door with his handsD. would carry a lot of things in both hands参考答案:I. 1.宾语补足语,to study hard 2.主语Learning English well3宾语补足语.go out 4.宾语to be a doctor 5.宾语what to do next6. (表语)make friends with me7.状语to see her father8. 主语to help others 9定语nothing to do10宾语补足语.sing a song in the roomII.1) BCACB 2) BCADDUNIT 2I.用动词不定式完成句子1. She told us _____________________________ (别在街上玩球).2. Can you tell me _________________________ (去车站怎么走).3. I need a piece of paper _________________________ (来写字).4. It’s nice ___________________________________ (在这里陪你谈话).5. It’s not a bad place ________________________________ (住).6. I am very pleased _________________________ (见到你).7. It’s easy _______________________________ (犯这样的错误).II. 阅读理解One of the things to be learnt in a foreign language is guessing all the time what kind of thing to come when listening to someone talking. People do this all the time in their own language, so it is necessary (必要的) to do this in a foreign language, too. Here are some examples.1. "What's the matter?" "I went to a party last night, so I…"2. "I feel so tired these days."" I think you'd better…"3."Of course, she never stops talking. She is one of the most…"You can see from the above three examples that the context (上下文) helps a lot in understanding what is being talked about. So "guessing "is very important in understanding English, especially (尤其)spoken English.1. This passage tells us mainly about _________.A. the importance of "guessing" in learning a foreign languageB. how to guess what one is going to talk aboutC. some examples of right guessingD. how important it is to guess all the time2. From the context, we can see maybe the finished answer in EXAMPLE I is_________.A. "… so I didn't have a good time."B. "…so I went to bed very late."C. "…. So I felt unhappy."D. "… so I got up very early."3. Maybe the finished answer in EXAMPLE 2 is ________.A. "I think you'd better have a good rest and take good care of yourself."B. "I think you'd better have something to drink."C. "I think you'd better get some help from your friends."D. "I think you'd better be more careful."4. Maybe the finished answer in EXAMPLE 3 is ______.A. "… she is one of the most famous film stars."B. "…she is one of the most beautiful women."C. "… she is one of the most famous speakers."D. " … she is one of the most talkative women."5. From the passage we can infer (推断) that guessing is _______in learning a foreign language.A. the only wayB. more important in spoken English than in written EnglishC. more important than any other wayD. more important in written English than in spoken English参考答案:I. 1. not to play in the street 2. how to get to the station3.to write on4. to talk with you5. to live6. to see you7. to make such a mistakeII.ABADBUNIT 3I.翻译练习:1. Johnson 先生去年教我们德语。
《大学语文》随堂练习参考答案
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《大学语文》随堂练习参考答案第一章《诗经》与《楚辞》1.诗经最具代表性的章法结构是()A.重章叠句,一唱三叹 B.层层递进C.首尾呼应 D.赋、比、兴参考答案:A2.周平王东迁后,一位大夫回到西周故都,只见黍苗遍野,没有了昔日的繁华,不禁悲从中来,对天呼号。
这种对《黍离》背景的解说来源于()A.论语 B.孟子C.毛诗序 D.诗经参考答案:C3.《蒹葭》三章开头都写到“蒹葭、白露”,用清秋景象引出诗人后面的抒情。
这种写作方法叫()A.起兴 B.赋C.比喻 D.象征参考答案:A4.《陌上桑》"行者见罗敷,下担捋髭须。
少年见罗敷,脱帽著帩头。
耕者忘其犁,锄者忘其锄。
"用()的手法描写了对秦罗敷的美。
A. 正写B.夸张C.侧写D.比喻参考答案:C5.《上邪》充分体现了汉乐府民歌极富艺术感染力、感情()的特色。
A.含蓄委婉B.激烈直露C.壮烈豪放D.乐观旷达参考答案:B6.《古诗十九首》从不同的侧面反映了( )在东汉末动乱的社会环境中不安的生活和苦闷的心情。
A.中下层文士B.劳动人民C.思妇游子D.女性参考答案:A7.《西北有高楼》的主题是()A.感叹知音难遇B.表达思妇游子之情C流露思乡怀亲之情 D.表现仕途失意之情参考答案:A8.“对酒当歌,人生几何?譬如朝露,去日苦多”。
这几句诗中用了( )A.疑问和比喻B.反问和夸张C.疑问和排比D.设问和比喻参考答案:D9.《饮酒》诗体现了陶渊明摈弃功名、崇尚自然的人生态度。
其全篇的纲是()A.心远B.采菊C.悠然D.饮酒参考答案:A10.诗经又叫“诗三百”,它共收有西周中叶到东周的300首歌谣。
()参考答案:×11.《黍离》在抒情上运用“赋”的手法,直抒胸臆,反复呼号亡国之痛。
()参考答案:√12.屈原开创的“楚辞”,是我国古典诗歌浪漫主义的源头和典范。
()参考答案:√13.屈原清高孤傲,《涉江》一诗集中表现了他难以排遣的孤独寂寞之情。
景区管理随堂随练答案
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一、单项选择题 (只有一个正确答案)【1】中世纪是欧洲()旅游的兴起和兴盛时期。
A: 温泉B: 观光C: 宗教D: 海滨答案宗教【2】我国的国家风景名胜区由()管理。
A: 环保部门B: 林业部门C: 建设部门D: 国土资源部门答案建设部门【3】旅游系统中,居于核心地位的是()。
A: 酒店业B: 旅行社业C: 景区系统D: 旅游主管部门答案景区系统【4】所有景区管理共同的根本性目标是()。
A: 获取利润B: 吸引更多的游客C: 深化游客体验D: 保护景区资源答案深化游客体验【5】景区的本质是()。
A: 异地休闲体验B: 旅游吸引物C: 企业D: 一种特殊的旅游场答案一种特殊的旅游场【6】九寨沟、张家界、中华五岳、美国黄石公园等按其功能属于()。
A: 历史古迹旅游景区B: 民俗风情类旅游景区C: 娱乐游憩旅游景区D: 观光型旅游景区E: 综合性旅游景区答案观光型旅游景区【7】下面各景区中,()景区与其他景区不属于同一类别。
A: 乡村公园B: 主题公园C: 古代园林D: 野生动物园答案古代园林二、多项选择题【8】按照约翰斯沃布鲁克的观点,景区分为()。
A: 自然型景区B: 特殊活动C: 并非为吸引游客而建造的景区D: 专门为吸引游客并满足其要求而建造的景区E: 度假型景区答案· 自然型景区· 特殊活动· 并非为吸引游客而建造的景区· 专门为吸引游客并满足其要求而建造的景区【9】在英文中,表示景区意思的词很多,其中较为常见的有()。
A: tourist attractionsB: places of interestC: placeD: travel industry sites答案· tourist attractions · places of interest · travel industry sites【10】17世纪后期到18世纪,人们对健康的关注促进了两种主要类型景区的开发,包括()。
法理学 随堂练习 答案
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法理学第一章导论1. 法与原始习惯的相同点是( )A、都有相同的经济基础B、都是调整人们相互关系的社会规范C、都在相同的范围内起作用D、都有保证实施的相同方式参考答案:B2. 根据法律的创制和表达的形式,可将法分为()A、成文法和不成文法B、一般法和特别法C、根本法和普通法D、自然法和实在法参考答案:A3. 下列各项中不属于法的本质的是()A、统治阶级意志性B、物质性约性C、经济以外因素对法的影响D、国家强制性参考答案:D4. 法的关系根源于()A、思想社会关系B、物质生活关系C、宗教关系D、民族关系参考答案:B5. 有选择地借鉴吸收其他国家或地区的法律的方法在法学上一般称为()A、法的全球化B、法的移植C、法的现代化D、法的国际化参考答案:B6. 下列说法中错误的是()A、权利能力即法律人格B、权利能力包含了义务能力C、享有权利能力的人必然享有行为能力D、权利能力与行为能力可以分离参考答案:C7. 法律关系的构成要素是指( )A、权利和义务B、主体、客体和内容C、主体和客体D、主体、权利和义务参考答案:B8. 下列表述中正确的有()A、任何不违法的行为,就是合法的行为B、不合法的行为就是违法的行为C、有一些行为虽不合法但也不构成违法D、不符合道德的行为一般也是不合法的行为参考答案:C9. 法律责任的减轻和免除的条件不包括()A、协议免责或意定免责B、正当防卫免责C、人道主义免责D、时效免责参考答案:B10. 下列有关法与经济关系的说法中错误的是()A、法是由经济基础决定的B、法对经济基础具有反作用C、法与生产力之间存在着作用与反作用D、法只能直接促进生产力的发展参考答案:D11. 法可以自发形成。
()参考答案:×12. 法所体现的统治阶级的意志是统治阶级内部各党派、集团及每个成员意志的相加。
()参考答案:×13. 大多数近现代法学家认为,法律是最低限度的道德。
()参考答案:√14. 法的实施的全过程需要国家强制力的介入。
华工软件工程随堂练习参考答案
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答题:A. B. C. D.(已提交)
参考答案:C
问题解析:
3. ( )是以提高软件质量为目的的技术活动。
A、技术创新B、测试C、技术改造D、技术评审
答题:A. B. C. D.(已提交)
参考答案:D
问题解析:
4.软件生命周期由软件计划、软件开发和()三个时期组成。
A.软件运行
B.软件维护
C.软件过程
13.研究软硬件资源的有效性是进行( )研究的一方面。
A.技术可行性
B.经济可行性
C.社会可行性
D.操作可行性
答题:A. B. C. D.(已提交)
参考答案:A
问题解析:
14.制定软件计划的目的在于尽早对欲开发的软件进行合理估价,软件计划的任务是()。
A.组织与管理
B.分析与估算
C.设计与测试
D.规划与调度
参考答案:A
问题解析:
47.为了提高测试的效率,应该( )。
A.随机地选取测试数据
B.取一切可能的输入数据作为测试数据
C.在完成编码后制定软件测试计划
D.选择发现错误可能性大的数据作为测试数据
答题:A. B. C. D.(已提交)
参考答案:D
问题解析:
48.使用黑盒法测试时,测试用例应根据( )。
A.程序的内部逻辑
答题:A. B. C. D.(已提交)
参考答案:B
问题解析:
34.结构化分析方法是一种预先严格定义需求的方法,它在实施时强调的是分析对象的( )。
A.程序流
B.指令流
C.数据流
D.控制流
答题:A. B. C. D.(已提交)
参考答案:D
问题解析:
2022秋四年级语文随堂练习参考答案
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四年级语文随堂练习参考答案随堂练习(一)书写工整,卷面整洁5分一、5分要求字距差不多,标点符号和字之间保持一定距离。
二、8分牵着坑坑洼洼庄稼期盼葡萄鹅卵堤岸三、15分 1.③①② 2.D 3.C 4.B 5.A四、5+5=10分1.示例:偷偷地探出了脑袋;一块柔软的绿毯2.夜空一片漆黑,忽然,“砰”地一声巨响,烟花在空中绽放,过了一会儿,随着噼里啪啦的响声,四周闪烁着几团金色的火花,一会儿功夫,火花灭了,夜空又恢复了寂静。
五、9分1.山草和野花的香味月光鹅卵石2.隆隆的响声闷雷滚动山崩地裂大地都被震得颤动起来3.返景入深林复照青苔上六、4+5+5+4=18分1.鬼斧神工生机勃勃2.鸟鸣流水雷母亲的爱在低语大地用手抚摸着自己的孩子3.示例:在一阵阵清脆的鸟鸣声中,青蛙和蚯蚓从沉睡中醒过来,一条条蚯蚓在土里扭动着身子来回松土,一只只青蛙跳上池塘的荷叶上,欢快地唱着歌,歌声把鱼儿、蟋蟀、蝴蝶都吸引过来了……4.表达了作者热爱大自然、赞美大自然的情感。
七、30分略书写工整,卷面整洁5分一、5分 9 1 2 7 4 8 3 10 5 6二、6分改善探奥联系愉快耐心舒适三、10分 1.按照即使恐怕 2.科学家唤联手研究超级工程创造四、4+3+3+3=13分1.氛纷培赔蝇绳狐狡2.B D3.C4.ACB五、5分我希望这个世界没有战争,没有贫困,没有伤痛,也没有分离。
六、8分人非生而知之者孰能无惑博学之审问之明辨之智能之士不学不成不问不知七、4+4+3+3+4=18分1.马铃薯红薯大蒜芋头2.(1)×(2)√(3)×(4)√3.大蒜素草酸钙龙葵素4.因为冬天的芋头里含有又苦又涩的草酸钙。
5.示例:马铃薯和红薯的“临时仓库”有什么不同?马铃薯的临时仓库是块茎,红薯的临时仓库则是贮藏根;马铃薯的块茎上有一个个的小芽眼,而红薯的表面却是光溜溜的。
八、30分略书写工整,卷面整洁5分一、5分 qū bǐnɡ xiánɡ zhòu sōu qīnɡ蜗慎毫幕二、11分 1.住宅邻卧客厅良好较选择2.操场瞧嫩绿均匀重叠空隙三、15分 1.C 2.B 3.C 4.D 5.C四、3+3+4=10分1.略2.略3.(1)拟人喜爱之情(2)不可以去掉。
国寿易学堂随堂一练答案
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国寿易学堂随堂一练答案•某人投保普通家庭财产保险,保险金额为0万元,其中房屋及其室内装潢的保险金额为万元。
在保险期限内发生保险事故,造成其房屋及其室内装潢部分损失万元,室内财产发生部分毁损,损失万元。
其中出险时房屋及其室内装潢的价值为万元,室内财产价值0万元。
那么,保险公司的赔偿金额是()。
正确答案是:3万元·根据我国消费者权益保护法的规定,消费者在购买使用商品和接受服务时享有的权利是()。
正确答案是:人身和财产安全不受损害的权利·与其他风险事故发生概率的波动性相比,人寿保险中被保险人的死亡率的特性是()。
正确答案是:相对稳定性·在按照风险性质划分的风险种类中,既有损失机会又有获利可能的风险被称为()。
正确答案是:纯粹风险·在保险活动中,被保险人一旦违反保证义务,保险人的正确处理方式是()。
正确答案是:部分的承担赔偿或给付保险金的责任·根据我国反不正当竞争法的规定,政府及其所属部门利用行政权利限制商品在地区之间正常流通,对其采取的惩处措施是()。
正确答案是:由上级机关责令其改正·保险营销员销售某类保险产品,应当明确告知客户此类产品的费用扣除情况,并提示购买此类产品的投资风险。
这类产品主要包括()。
正确答案是:分红保险、投资连结保险和万能保险等保险新型产品·保险人以预定死亡率和预定利率为基础所计算的保险费属于()。
正确答案是:纯保险费·保险公司承保过程的核心环节是()。
正确答案是:核保·根据我国家庭财产保险的规定,家庭财产保险的保险责任包括()等。
正确答案是:存放于室内的保险财产,因遭受外来的、有明显痕迹的盗窃、抢劫·在订有自动垫交保险费条款的长期人寿保险合同中,其保费垫交期间的保险合同效力状况是()。
正确答案是:继续有效·按照保险合同的通常规定,由于正常维修保养引起的费用及间接损失,保险人对此不承担责任,这种责任免除类型属于()。
随堂练1 2数学参考答案
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随堂练1 2数学参考答案在数学课堂上,难免会遇到一些难题,而老师给出的参考答案往往是我们解题的重要依据。
本文将为大家提供一些数学难题的参考答案,希望能够帮助大家更好地理解和掌握数学知识。
首先,我们来看一道关于代数的题目。
题目如下:已知a + b = 5,a - b = 3,求a和b的值。
我们可以通过联立方程的方法来解决这个问题。
将两个方程相加,得到2a = 8,因此a = 4。
将a的值代入其中一个方程中,可以求得b的值为1。
所以,a = 4,b = 1。
接下来,我们来看一道几何题。
题目如下:一个正方形的边长为3cm,求其对角线的长度。
我们可以利用勾股定理来解决这个问题。
对角线的长度可以表示为d = √(a² +b²),其中a和b分别表示正方形的边长。
将a和b代入公式中,得到d = √(3² + 3²) = √18 ≈ 4.24cm。
所以,对角线的长度约为4.24cm。
接下来,我们来看一道概率题。
题目如下:一个袋子里有5个红球和3个蓝球,从中随机取出一个球,求取出的球是红球的概率。
我们可以利用概率的定义来解决这个问题。
取出红球的概率可以表示为P(红球) = 红球的数量 / 总球的数量。
将红球的数量5代入公式中,总球的数量为8,所以P(红球) = 5/8 ≈ 0.625。
所以,取出的球是红球的概率约为0.625。
最后,我们来看一道关于函数的题目。
题目如下:已知函数f(x) = 2x² + 3x - 1,求f(2)的值。
我们可以将给定的x值代入函数中,计算得到f(2) = 2(2)² + 3(2) - 1 = 2(4) + 6 -1 = 8 + 6 - 1 = 13。
所以,f(2)的值为13。
通过以上几个例子,我们可以看到,数学题目的解答往往需要我们灵活运用所学的数学知识和方法。
在解题过程中,我们可以通过代数、几何、概率等不同的数学领域的知识来解决问题。
英语随堂练习册九下答案
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英语随堂练习册九下答案【练习一:词汇运用】1. The teacher asked the students to _______ (注意) the blackboard.答案:pay attention to2. He _______ (成功) in passing the driving test on his first try.答案:succeeded3. The _______ (环境) is getting worse in many parts of the world.答案:environment4. She is _______ (好奇) about everything new.答案:curious5. The _______ (英雄) of the story saved the town from danger.答案:hero【练习二:语法填空】Read the following passage and fill in the blanks with the correct form of the words given in brackets.Today, many people are concerned about the _______ of the Earth. (pollute)答案:pollutionThe air in the city is _______ than it was ten years ago.(bad)答案:worseWe should _______ our environment and reduce pollution. (act) 答案:actSome _______ animals are in danger because of the environmental changes. (live)答案:living【练习三:阅读理解】Read the passage and answer the questions.Passage:The Internet has changed the way we live. People can now shop, work, and communicate online. It has made our lives more convenient and efficient. However, it also has some negative effects. For example, some people spend too much time online and neglect their health.1. What has the Internet changed?答案:The way we live.2. Why is the Internet considered efficient?答案:Because it allows people to shop, work, and communicate online.3. What are some negative effects of the Internet mentionedin the passage?答案:Spending too much time online and neglecting health.【练习四:完形填空】Read the following passage and choose the best answer for each blank.Once there was a young man who wanted to be a great artist. He _______ a lot of time practicing his skills. (A) However, he was not very successful. (B) One day, he decided to_______ his work to a famous artist for advice. (C) The famous artist told him to _______ his practice and not to give up. (D)A. spentB. butC. showD. continue1. _______答案:A2. _______答案:B3. _______答案:C4. _______答案:D【练习五:书面表达】Write a short essay about the importance of protecting the environment. (120 words)范文:The environment is our home, and it is crucial to protect it.Pollution has become a serious problem that affects ourhealth and the planet's ecosystems. We should take actions to reduce waste, recycle more, and use renewable energy sources. By doing so, we can ensure a cleaner and healthierenvironment for ourselves and future generations. Remember, every small step counts in the fight against pollution.结束语:通过这些练习,我们不仅能够巩固英语知识,还能提高我们的英语应用能力。
大学英语二随堂练习及答案
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大学英语二随堂练习及答案《大学英语二》随堂随练返回目录交际用语1、Maria: Morley, where are the cookies. Don’t tell me you ate them all!Morley: Yes, I did. _________ .A、I couldn’t bear it.B、They were too good to eatC、I couldn’t help it.D、They were good to eat2、Secretary: Hello,_______ May I help you?Caller: Yes, this is Albert Kordell. May I speak to Elaine Strong, please.A、Ultimate Computers.B、Who are you?C、Who is speaking?D、I’m the secretary.3、Speaker A: I’m so worried about this job interview.Speaker B: Don’t worry. _______ .A、Take a breakB、Just give upC、Mind youD、Just be yourself4、Adam: Mmm….. This is the best pudding I’ve ever had!Celia: ________ I know you’d like it.A、Didn’t’t I tell you?B、Did I say it right?C、Is what I said right?D、What did I say?5、Speaker A: Sorry about all the inconvenience.Speaker B: ________ .A、Don’t worry about itB、OK. With great pleasureC、Oh, really. That’s OKD、I′ m sorry to hear that6、Speaker A: Want to come over Thursday for supper?SpeakerB: _______ .A、I re ally can’t. You’ll not mind, I thinkB、Let’s put it off till laterC、Thanks, but I have to work that eveningD、No, I don’t want to7、Speaker A: We’ve made an appointment with the students. We’ll meet at 7 in the morning. Can you come on time?Speaker B: I’m afraid, _________ . It’s too early.A、I can’t do itB、I can’t get itC、I can’t make itD、I can’t achieve it8、Receptionist: Can I help you?Customer: ______. Where do I pay my fees?A、As you pleaseB、Yes, pleaseC、Thank youD、Yes, you can9、Operator: ______, May I help you?Bill: I’d like to set up a telephone service, please.A、SpeakingB、HeyC、I’m John SmithD、Pacific Bell10、Gregory: Let's take a coffee break, shall we?Flora: _______, but I can’t.A、I wish I couldB、We shallC、Yes, let'sD、You will11、Mickey: You look a little pale. Are you OK?Nancy: _______, I feel terrible.A、T o speak outB、To begin withC、T o tell you the truthD、To sum up12、Thad: Gee, Susan. I'd love a cup of coffee.Susan: ______. Is instant OK?A、Sure thingB、No problemC、I'm sureD、No kidding13、Thomas: Hey, you look concerned.______Jack: The final exam. I'm not fully prepared yet.A、What a lovely day!B、What has attracted you?C、What's on your mind?D、What about seeing the doctor?14、Jessica: I got home very late last night. I hope I didn’t disturb you. Landlady:______,A、No. I heard a lot of noiseB、Yes, I didn’t hear any noiseC、Yes. I didn’t hear youD、No. I didn’t hear a thing15、Jackson: What’s there to do at night?Clerk: There are clubs, concerts, plays, and so on._______!A、You make itB、You name itC、You find itD、You manage it16、Ida: _______Where was I?Homer: You were talking about your trip to South Africa.A、What did I hear?B、Let’s check in.C、Let’s back up.D、What were you talking about?17、White: How are you?Harrison: I’m fine. Thank you. And you?White: _______A、Me, too.B、I, too.C、Fine.D、Thanks.18、—I’m told Jerry’s mother is ill.—________.A、I’m saB、C、I’m sorry to hear that.D、Don’t worry.E、Take it easy.19、—________?—It’s Sunday.A、What day is it todayB、What date is it todayC、What’s the dateD、What’s day20、—My watch is not working. ________?—It’s ten past eleven.A、What time is itB、What’s the timeC、What time is it by your watchD、What is time by your watch21、Marilyn: Don’t you like to eat Korean food?Robbie: ________.A、No, Korean food is not real to my tasteB、No, because Korean food is very goodC、No, I prefer to have Chinese noodlesD、No, I like very much to eat Korean food22、—It’s very kind of you to help me with my English.—________.A、Never mindB、Not at allC、That’s all rightD、You’re so welcome23、—________?—I’d like to see a pair of brown shoes.A、What do you wantB、What do you likeC、What can I do for youD、Do you want to buy something24、—Shall I use your dictionary?— ________.A、Certain, you mayB、Of course, you can.C、Surely, you can’tD、No, please get out25、A: East Bouren 54655.B: Hello. Terresa here. Can I speak to Jack, please?A: ________B: OK.A、Who’s that speaking?B、Could you take a message?C、I think she’s gone shopping.D、Hold the line, please.26、—How’s your brother these days?—He hasn’t been too well just recently.—________. What’s the matter?—I think he’s been over working.A、It’ll be pleased to hear you ask after himB、That’s not too badC、I’m sorry to hear thatD、I’ll tell him what you said27、Teacher:Where is Mike this morning?Student:He's got a cold.Teacher:______A、He is absent.B、What's the matter with him?C、Just tell him to take it easy.D、What? Where is he?28、Melba: It's late. I had to say goodbye.Mrs. Blank:______A、Hope you had a good time. See you tomorrow.B、Why do you want to go now?C、I'd like to say goodbye,too.D、That's all right.29、Steve:Can I get you a cup of coffee?Julia:______A、I don’t ta ke sugar, thank you.B、You can, please.C、Thank you for the coffee.D、That’s very nice of you.30、Salesman:______Customer:Yes. What size is that green T-shirt?A、Anything I can do for you?B、Do you want to buy anything?C、Excuse me,what are you doing?D、Are you just looking around?31、Student A:I feel sick.Student B:______Student A:I'm not sure,but I have got a bad headache.A、I'm sorry to hear that.B、How are you feeling now?C、How long have you been sick?D、Do you have a temperature?32、Richard:You’ve given us a wonderful Chinese dinner,Mrs. Liu.Mrs. Liu:______A、I’m glad you enjoyed it.B、Oh,I'm afraid I didn't cook very well.C、Come again when you are free.D、It’s not necessary for you to say so.33、A:Can I do anything for you?B:______A、No. You ca n’t do anything for me.B、No,it’s alright. I can manage myself.C、Never minD、E、It's my pleasure.34、Olivia:Do you mind if I play some music?Bill:______. I'm writing my assignment.A、Of course I doB、Not at allC、Of course notD、Certainly35、Desk Clerk:Good afternoon,Holiday Inn.Customer:Hello,I’d like to book a double room for the nights of 23rd and 24th please. Desk Clerk:______A、What’s the mat ter?B、Just a minute, please.C、What can I do for you?D、Can I help you?36、A:I’ve just heard that the tick ets for Swan Lake have been sold out!B:Oh, no!______A、I was looking forward to it.B、It doesn’t matter.C、It's not at all interesting.D、I knew it already.37、Newman: I have an appointment with Mr. Brown.Receptionist: Mr. Brown is expecting you now. ____________A、Come this way, please.B、Go this road, please.C、Follow this direction, please.D、Move here, please.38、Philip: Danny, I got fired this morning. Could you help me?Danny: How come? Last time I saw you, you told me it was agood job and you would like to take it as a career.Philip: ________________ In a word, I didn’t do a good job of it. I messed up a buA、I have many words to say.B、There is much to discuss.C、It’s a long story.D、It’s a long-time talk.39、Salina: Dear Jacky, why don’t you com e on holiday with us?Jacky: ______A、How dare you invite me? I won’t go.B、Yeah, thanks anyway.C、Whether I’ll go or no t is not your business, ok?D、That’s very kind of you. I’d love to.40、Doctor: _______Patient: I’ve caught a bad cold and got a sour throat.A、Do you have anything to declare, sir?B、What seems to be the problem?C、Good morning. May I help you?D、How have you been getting along recently?41、Nicholas: Hello. May I speak to T om?Tom: ______A、Sorry, the number is engageB、Will you hold?C、Hello. Who’re you, please?D、Hello. Thank you for calling.E、Yes, speaking.42、A: Firstly, allow me to introduce myself. My name is John Brown, manager of the company.B: ______A、You must be mistaken. I don’t know you at all.B、How do you do, Mr. Brown? Very happy to see you.C、Hello, Brown! I haven’t seen you for ages.D、Hi, John! Welcome to Chin43、Dad: Could you run over to the store right away? We need a few things.Son: _____A、Yes, I coulB、I want to play football.C、All right. What do you want me to get?D、For me, running is not a problem. I’d like to do exercises.E、Yes, storing a few things away is quite necessary, right?44、Waiter: Welcome, sir. May I help you?Customer: ______A、Thank you. I’ll have fried tofu and stir-fried cauliflower.B、Sorr y. I don’t need your help, thank you.C、If you want to help me, I’ll be glad to acce pt it.D、Yes, please. I’d like a hamburger and a chocolate shake.45、Pupil: I apologize for being late this morning. My alarm clock didn’t ring. Teacher: ______A、Would you please forgive me? I never accept any apologies at all.B、That’s all right. T hese things often happen.C、Thank you. You’re really too kind apologizing to me.D、Never minE、You don’t have to be so polite.46、Son: Mom, may I play my computer game for an hour or two? Mom: _______A、Your teacher tells me that you should study harder.B、Sorry, Dad’s using the computer now.C、I’ve said before that the game takes too long.D、Well, ah…. You’re absolutely right to ask.47、A: What a surprise! You changed your hair style.B: Yes, and another surprise. I’m going to get married nex t Saturday.A: ______A、Really? Congratulations!B、Oh, sorry, I nearly forgot that.C、How about another time? I’ll be busy then.D、That’s OK. Saturday is the most suitable day for any marriage.48、Guest: Oh, it’s ten o’clock. I’d better go now.Host: ______A、OK. Please walk slowly.B、Why do you want to go now? Don’t you want to stay?C、Yeah, it’s really late. Why not immediately?D、Won’t you stay for another cup of coffee?49、Paul: Can I help with your luggage?Lisa: ______.A、No, many thanks. I can doB、No, thanks. I can manage itC、No, not necessary. Thank you anywayD、No, you needn't. Thank you anyway50、Guest: Have you a single room for tonight and tomorrow night with a telephone and shower?Clerk: We haven’t any rooms with a shower free just now, but there’s a bathroom available on each floor.Guest: ______.A、All right. That’ll doB、Oh, sorry. Forget itC、How regretful! I give it upD、All right. It does《大学英语二》随堂随练返回目录词汇与结构1、It’s very cold outside. You______put on your overco at.A、had better toB、would better toC、had betterD、would better2、Make______use of your time in class.A、goodB、badC、carelessD、inadequate3、Review important points______in class as well as points you remain confused about.A、mentionB、mentionedC、mentioningD、to mention4、There was a house at______.A、the mountain footB、the foot of the mountainC、the feet of the mountainD、the mountain’s foot5、Tests provide grades, but they also let you know what you need to spend more time______ and they help make your new knowledge permanent.A、to studyB、studyC、studiedD、studying6、There are other techniques that might help you______your studying.A、withB、atC、intoD、over7、 A person who talks to______is not necessarily mad.A、himselfB、oneselfC、yourselfD、itself8、Can this camera______good photos?A、makeB、to makeC、takeD、take9、Who was the first person______ today?A、spoke to youB、whom you spoke toC、you spokeD、whom you spoke10、Even students of average______can be top students without additional work.A、diligentB、diligenceC、intelligentD、intelligence11、Processed food and food______contains chemicals andpreservatives should be avoided.A、whenB、whereC、whichD、who12、We expected about 20 girls but there were______people there.A、anotherB、othersC、someD、more13、Food alone is not the______of energy.A、sourceB、resourceC、forceD、grocer14、They resort______fast food which is fatty and contains high amount of cholesterol.A、withB、atC、onD、to15、This morning our water supply was______because the pipe burst.A、awayB、downC、offD、up16、Quite a lot of people watch TV only to______time.A、wasteB、spendC、killD、past17、Tom’s parents died when he was young, so he was______by his uncle.A、brought upB、brought outC、grown upD、taken out18、She hardly ever eats______potatoes.A、bread notB、bread orC、neither bread orD、neither bread nor19、The health seeking youths can following the______of natural living.A、principlesB、principalsC、principalityD、prince20、Molly doesn’t eat fish.______.A、So doesn’t John.B、Neither does John.C、John doesn’t too.D、John doesn’t either.21、______it is from Bristol to Glasgow!A、What long a wayB、What distanceC、How long wayD、How far22、______a single mom made things even more difficult.A、BeB、BeingC、IsD、Was23、The girl______the bicycle is Jane.A、riding onB、driving inC、riding inD、driving on24、Tom is waiting______the doctor.A、to seeB、to seeingD、for seeing25、I’m not sure which restaurant______.A、to eat onB、eating atC、to eat atD、for eating26、Do not express shock for what you hear______matter how shocking it might seem.A、notB、neverC、noD、none27、When you go abroad, do you ______take your passport?A、have toB、ought toC、needD、must28、Regardless______hisappearance, he is innocent.A、toB、inC、ofD、for29、It was______that he couldn’t finish it alone.A、a so difficult workB、a so difficult jobC、such a difficult jobD、such a difficult work30、As we took our seats on the bus, I noticed a woman______with a young adult close to us.A、sitB、be sitC、sittingD、sits31、Daddy was in a______for several days.A、dramaB、comaC、somaD、tome32、You must obtain______from the landowner to fish in this river.A、permissionB、omissionC、celebrationD、graduation33、Tom is going to a concert tomorrow evening. So______.B、am IC、I willD、will I34、I was surprised when the shopkeeper told me that my father had visited the shop, paid for the framing and______them wrapped.A、shouldB、wouldC、hadD、could35、Even though we had lost the______of our family, everyone came on Christmas Day—making an effort to be cheerful.A、bachelorB、masterC、doctorD、post doctor36、I can’t un derstand______at that poor child.A、you to laughB、you laughC、why laughD、your laughing37、The portraits______look like them, but I was still unsure of my painting techniques.A、didB、doesC、to doD、doing38、That’s the hotel______last year.A、which we stayedB、at which we stayed atC、where we stayed atD、where we stayed39、The good service at the hotel______the poor food to some extent..A、made up forB、made upC、made forD、made out40、His long______raised fears about his safety.A、absentB、absenteeC、absentingD、absence41、As a visitor or guest in either a Chinese home or restaurant you will find that______ manners are important to the enjoyment of your meals and keep you in high spirits!A、deskB、tableC、chairD、bench42、It seemed as if all of a______ the animal had smelt danger in the air.A、suddenB、momentC、minuteD、once43、When hosts place dishes on the table, they will arrange the main course at the center with the other dishes______placed around them.A、evenlyB、evenC、oddD、oddly44、The tradition of using chopsticks was introduced______many other countries.A、withB、ofC、fromD、to45、The invention of chopsticks______the wisdom of Chinese ancient people.A、deflectsB、reflectsC、conflictsD、relicts46、The little boy put the bird in a cage to______it from flying away.A、avoidB、preventC、hinderD、resist47、______of his wealth, John is not very happy.A、BesideB、Because ofC、In spite ofD、Besides48、I have classes______ day: Mondays, Wednesdays, and Fridays.A、each otherB、every otherC、on one way or anotherD、any other49、He sent______from Canada.A、her a cardB、to her a cardC、card to herD、to her card50、Her plane takes______at 3 p.m.A、upB、offC、onD、in51、My brother is four years older than me and someone I look______to, even though he is shorter than me.A、upB、downC、belowD、over52、My parents told me that my brother had been______witha rare disease.A、realizedB、diagnosedC、generalizedD、computerized53、I______bacon and eggs every morning.A、am used to eatB、used to eatingC、am used to eatingD、am using to eat54、His grandmother______born in France.A、hasC、isD、was55、I walked______the Seventh Avenue to catch a bus.A、untilB、as long asC、as far asD、till56、My husband lived at home before we were married, and so______.A、did IB、had IC、I hadD、I did57、We haven’t got______furniture like theirs in our home.A、aB、theC、someD、any58、People say fish and chips is typical______Britain.A、ofB、fromC、toD、with59、My mother was relieved that her son would be satisfied with his performance so he wouldn’t do another one, at least for her______.A、sakeB、lakeC、make60、His face is______to me, but I can’t remember where I’ve seen her.A、similarB、familiarC、friendlyD、alike61、The music that Americans are used to______to might sound strange to someone from another culture.A、listenB、be listenedC、listeningD、listened62、What we think of as music depends______where we live.A、onB、toC、withD、at63、Today, many cultures divide music______art music and music of the people.A、fromB、intoC、overD、beneath64、Our plane______down at 7: 00 p.m. to be exact.A、letB、visitedC、landedD、touched65、As the ocean water changes to ice, it keeps thetemperature______falling too far.A、withB、intoC、besidesD、from66、You’ll have to pay for the holiday in______, Sir.A、frontB、advanceC、aheadD、forward67、Antarctica is the most______continent on the planet.A、isolatedB、generatedC、acceleratedD、congratulated68、“Oh, I’m sorry,” he______her.A、criedB、toldC、apologizedD、said69、The cold and dry climate of Antarctica______it one of the toughest places on Earth to live.A、producesB、manufacturesC、doesD、makes70、Sea birds______penguins live on the Antarctic Peninsula, because the weather isn’t quite so terrible there.A、likeB、dislikeC、likelyD、unlikely71、Niu Lang______his lonely and poor life with an old cow, his only friend.A、residedB、inhabitedC、livedD、dwelt72、The Queen of Heaven was so angry______she had Zhi Nu brought back to heaven.A、thisB、thatC、theseD、those73、 A few of______are planning to drive to Beijing during the spring break.A、we girlsB、us girlsC、girls weD、girls74、I suggested______fishing.A、that we goingB、that we to goC、that we goD、that we went75、The seventh day of the seventh lunar month is the only Chinese festival devoted______love in the Lunar calendar.B、toC、inD、on76、I can’t remember her name. It’s on the______of my tongue.A、endB、pointC、topD、tip77、The outside of our house was ______painted blue.A、beforeB、firstlyC、originallyD、lastly78、There’s no doubt that modern people have less and less personal spacethanks______beepers,cell phones and e-mail.A、toB、intoC、offD、of79、We’re______to hand in our homework next week.A、proposedB、supposedC、opposedD、imposed80、According______travel agents, the growth trend in travel is the half-week sneak-away built around a weekend.A、atB、onC、toD、in81、When Americans take a break, they oftenhead______their favorite vacation place.A、intoB、ontoC、overD、for82、Never______, we’ll see the film next week.A、mindB、to mindC、mind youD、in mind83、After two months, he had______news of what she was doing in Tokyo.A、fewB、littleD、a84、______I tell you yesterday not to touch that dog!A、Haven’tB、Hasn’tC、Didn’tD、Aren’t85、Tom was sitting just______ Jack and Jerry.A、exceptB、amongC、besideD、off86、My I have two______instead of beans, please?A、corn’s earB、corn earsC、ear of cornsD、ears of corn87、The house______beside the lake.A、restedB、reposedC、satD、stood88、The convenience of modern freeways, railways and airplanes makes travel in America as easy as______.A、pieB、breadC、soupD、wine89、Would you______the stamps on to the envelope for me, please?A、stickB、suckC、pickD、spit90、Throughout their history, Americans have been people______the move.A、inB、onC、toD、with91、Detroit owes its rapid growth and one time prosperity______the automobile, and above all to Henry Ford.A、atB、fromC、toD、on92、Henry Ford was himself a______mechanic and couldbuild a car with his own hands.A、bearB、boreC、bornD、bearing93、Can you divide 30______6, please?A、inB、byC、withD、of94、She hasn’t seen her family______ three ye ars ago.A、sinceB、fromC、forD、before95、Jack never showed______at the cinema, although I waited over an hour.A、offB、inC、onD、up96、In the 1960s, there was a change in fashion in______of small cars.A、feverB、foveaC、favorD、fear97、I’ve never seen______deer in the park before.A、that muchB、so muchC、so manyD、as much98、He______to go to the police.A、warnedB、threatenedC、suggestedD、shouted99、She used______all her clothes there.A、buyB、to buyingC、buyingD、to buy100、If you had taken the medicine yesterday, you______much better now.A、must have feltB、might have feltC、would have felt。
2023—2024学年度下学期随堂练习九年级物理试题含答案解析
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2023—2024学年度下学期随堂练习九年级物理试题含答案解析一、单选题(共24 分)1. 我国古代科技著作《天工开物》中,对釜的铸造有“铁化如水,以泥固纯铁柄勺从嘴受注”这样的记载。
下列自然现象的形成过程与“铁化如水”描述的物态变化相同的是()A.山间的大雾 B.湖面上的寒冰 C.冰雪消融 D.草地上的白霜【答案】C【解析】“铁化如水”描述的是铁由固态变为液态的过程,属于熔化现象;A.山间的大雾,是空气中的水蒸气遇冷凝结成的小水滴,属于液化现象,故A不符合题意;B.湖面上的寒冰,是湖水凝固形成的,属于凝固现象,故B不符合题意;C.冰雪消融,是固态的冰熔化成液态的水,属于熔化现象,故C符合题意;D.草地上的白霜,是空气中的水蒸气遇冷凝华成的小冰晶,属于凝华现象,故D不符合题意。
故选C。
2. 如图所示是抚顺市美丽的月牙岛夜景,每当暮色降临,流光溢彩,美不胜收的夜景尽现眼前。
关于此情景下列说法正确的是()A.桥上闪闪发光的灯带不是光源B.水中灯带的倒影是由光的反射所形成的实像C.水中桥的倒影与“立竿见影”的“影”形成原理相同D.灯光秀时,在红色灯光照射下,桥因为反射红光所以看起来是红色的【答案】D【解析】A.桥上闪闪发光的灯带正在发光,所以是光源,故A错误;B.水中灯带的倒影属于平面镜成像,是由光的反射所形成的虚像,故B错误;C.水中桥的倒影的成像原理是光的反射,“立竿见影”的“影”的形成原理是光的直线传播,所以原理不同,故C错误;D.不透明物体的颜色是由其反射的色光决定的,所以灯光秀时,在红色灯光照射下,桥因为反射红光所以看起来是红色的,故D正确。
故选D。
3. 2023年7月,我国研制的电磁弹射微重力实验装置启动试运行,该装置采用电磁弹射系统将实验舱垂直加速到预定速度后释放,实验舱在上抛和下落阶段可为科学载荷提供持续4秒、微重力达10μg的环境,相关性能指标达到国际先进水平。
下列说法正确的是()A.实验舱加速时一定受到平衡力的作用B.在微重力环境中桌面上的物体对桌面有压力C.实验舱加速过程中,机械能不变D.在微重力环境中,物质的质量变小【答案】B【解析】A.实验舱加速时,运动状态发生改变,一定受到非平衡力的作用,故A错误;B.在微重力环境中,物体对桌面的压力远小于其重力,但物体对桌面的压力仍然存在,故B正确;C.当实验舱加速时,它的速度在增加,因此动能增加。
东财专升本财务分析随堂随练答案
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东财专升本财务分析随堂随练答案财务分析》随堂随练【知识点1】1、财务报表分析的首要主体是()答案: AA、投资者B、债权人C、经营者D、政府管理机构2、企业投资者进行财务分析的根本目的是关心企业的()答案:AA、盈利能力B、营运能力C、偿债能力D、增长能力3、从企业债权者角度看,财务分析的最直接目的是看()答案:CA、盈利能力B、营运能力C、偿债能力D、增长能力4、在财务分析中,最关心企业资本保值增值状况和盈利能力的利益主体是()答案: AA、投资者B、债权人C、经营者D、政府管理机构5、财务分析的作用在于()答案: ABCDEA、评价企业过去B、反映企业现状C、评估企业未来D、进行全面分析E、进行专题分析6、企业财务报表分析的主体包括()答案: ABCDEA、投资者B、债权人C、经营者D、政府管理部门E、企业员工7、财务分析的主要目的是分析企业的()答案: ABCDA、盈利能力B、营运能力C、偿债能力D、增长能力E、综合能力【知识点2】8、下列有关财务报表的表述中不正确的是()答案: DA、基本财务报表包括资产负债表、利润表、现金流量表和所有者权益变动表B、利润表和资产负债表是以权责发生制为基础编制的C、现金流量表是收付实现制(现金)为基础编制的动态会计报表D、资产负债表、利润表以及利润分配表均属于动态会计报表9、下列选项中,不属于资产负债表提供的财务信息是()答案:CA、资产结构B、负债水平C、经营成果D、资金来源状况10、提高企业营业利润的方式可以通过()答案: DA、增加营业外收入B、降低营业外支出C、降低所得税D、增加销售收入11、息税前利润就是利润表中未扣除利息费用和所得税之前的利润,可以用另一种方式来测算,即:利息费用和所得税加()答案:BA、利润总额B、净利润C、主营业务利润D、利润分配12、资产负债表中的资产项目排列是()答案: AA、按流动性由强到弱自上而下排列B、按流动性由弱到强自上而下排列C、依据资产的使用年限长短D、依据资产的价值大小13、资产负债表中的负债项目排列是()答案: AA、按到期日的远近自上而下排列B、按流动性自上而下排列C、依据负债金额的大小排列D、依据负债的先后顺序排列14、资产负债表中的所有者权益项目排列是()答案: BA、依据权益的流动性B、永久程度高的在前,低的在后C、依据投资顺序D、永久程度高的在后,低的在前15、我国企业的利润表一般采用的格式是()答案: CA、账户式B、报告式C、多步式D、单步式16、一般而言,对于一个健康发展的企业而言,企业现金流量的主要来源应该是()答案: AA、经营活动产生的现金流量B、投资活动产生的现金流量C、筹资活动产生的现金流量D、企业内部留存收益17、股东权益变动表是()答案: BA、月份报表B、年度报表C、季度报表D、半年度变动表18、能使经营现金流量减少的项目是()答案: CA、无形资产摊销B、出售长期资产利得C、存货增加D、应收账款减少19、现金流量表的编制基础是()答案: DA、永续盘存制B、定期盘存制C、权责发生制D、收付实现制20、货币资金包括()答案: ABEA、库存现金B、银行存款C、应收账款D、应收票据E、其他货币资金21、在资产负债表中,流动资产项目包括()答案: ABCDEA、货币资金B、交易性金融资产C、预付账款D、应收票据E、存货22、下列选项中,流动资产项目包括()答案: ABCDA、货币资金B、应收票据C、应收账款D、存货E、无形资产23、下列选项中,流动负债项目包括()答案: ABCDA、交易性金融负债B、应付票据C、应付账款D、短期借款E、应付债券24、资产负债表的作用包括()答案: ABCEA、揭示经济资源总量及其分布形态B、获取企业资产流动性水平信息C、提供分析企业偿债能力的信息D、反映企业盈利能力 E、反映企业资金来源及其构成情况25、我国企业利润表包括的利润形式有()答案: ABCA、营业利润B、利润总额C、净利润D、每股收益E、稀释每股收益26、利润表的作用包括()答案: ABCDA、有助于企业进行合理经营决策B、揭示企业经营成果C、有助于考核评价经营者经营业绩D、反映企业盈利能力E、反映企业资金来源及其构成情况27、现金流量表中现金所包括的具体内容是()答案: ABCA、库存现金B、银行存款C、短期证券D、发行债券E、发行股票28、通过现金流量分析所揭示的信息,其作用主要是()答案:ABCDA、了解现金流变动情况及其原因B、评价企业的支付能力C、评价企业的盈利质量D、预测未来现金流量E、获取企业资产流动性水平信息29、股东权益变动表所反映的信息包括()答案: ABCDEA、会计政策变更和前期差错更正的累积影响金额B、净利润C、直接计入股东权益的利得和损失项目及其总额D、股东投入资本和减少资本 E、利润分配【知识点3】30、公司对外提供的反映公司某一特定日期财务状况和某一会计期间经营成果、现金流量的文件是指()答案: BA、财务报表B、财务报告C、财务状况说明书D、资产负债表31、对企业一定会计期间内生产经营、资金周转和利润实现及分配等情况的综合性说明是指()答案: CA、财务报表B、财务报告C、财务状况说明书D、财务报表附注32、注册会计师可能对所审计的财务报告提出的意见中,属于有利意见的是()答案: AA、无保留意见B、有保留意见C、否定意见D、无法表示意见33、以上市公司为例,财务报告体系一般包括()答案: ABCEA、财务报表B、审计报告C、财务状况说明书D、财务比率E、财务报表附注34、财务情况说明书()答案: ABCDEA、是企业管理当局对企业业绩的自我评价 B有助于报表使用者对企业作出良好的判断C能衡量出企业管理当局对存在问题的认识和分析的深刻程度D有助于报表使用者有更全面、更深刻的理解E有助于报表使用者客观地评价企业经营者的业绩35、按照《企业会计准则第30 号——财务报表列报》的要求,在报表附注中至少应披露()答案: ABCDEA、企业的基本情况B、财务报表编制的基础,遵循会计准则的声明C、重要会计政策和会计估计的说明D、会计政策和会计估计变更以及差错更正的说明E、重要报表项目的说明等36、审计意见可划分的类型有()答案: ABCDEA、无保留意见B、带强调事项段的无保留意见C、保留意见D、否定意见E、无法表示意见【知识点4】37、将企业报告期的分析数据直接与基期进行对比求出增减变动量和增减变动率并加以分析的方法是()答案: A A、水平分析法 B、垂直分析法 C、趋势分析法 D、比率分析法38、某企业 2008年期初存货余额为 2000万元,期末存货余额为3000 万元,则其变动率为()答案: AA、 50%B、 150%C、 25%D、 20%39、下列分析方法中属于静态分析方法的有()答案: ABDEA、水平分析法B、垂直分析法C、趋势分析法D、比率分析法E、因素分析法【知识点5】40、()是通过计算财务报表中各项目占总体的比重或结构,反映财务报表中各项目的相对重要性以及财务报表的总体结构关系。
七年级下册数学人教版第六章随堂练(有答案)
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6.1平方根一、单选题1.化简24的结果是( ) A.4- B.4 C.4± D.22.3的平方根是( )A.9B.3C.3-D.3±3.16的平方根是( )A.4B.4-C.4±D.164.已知一个正数的两个平方根分别是3a +与215a -,那么这个数是( )A.4B.7±C.7-D.495.下列说法错误的是( )A.算术平方根是本身的数为0和1B.0.36的算术平方根为0.6C.()25=5-D.-9的算术平方根是-3二、填空题6.如果一个正方形的面积是3,那么它的边长是 .7.9的算术平方根是______________.三、解答题8.已知27a -的平方根是5±,21a b +-的算术平方根是4,求a b -+值.参考答案1.答案:B24164==.故选B.2.答案:D本题考查平方根的概念.根据题意,3的平方根是,故选D.3.答案:C16的平方根是4=±.故选C.4.答案:D由题意得()()32150a a ++-=,解得4a =,则37a +=,故这个正数为49.5.答案:D因为负数没有算术平方根,所以选项D 错误.6.7.答案:3239,=∴9的算术平方根为3.8.答案:2552725,16a a ±∴-=∴=的平方根是,1642116,15a b b ∴++=∴=-的算术平方根是, ()1541519b =-=--=-6.2 立方根一 、选择题1.下列说法正确的是( )A.如果一个数的立方根是这个数本身,那么这个数一定是0B.一个数的立方根不是正数就是负数C.负数没有立方根D.一个不为零的数的立方根和这个数同号,0的立方根是02.下列说法正确的是()A.如果一个数的立方根是这个数本身,那么这个数一定是0B.一个数的立方根不是正数就是负数C.负数没有立方根D.一个不为零的数的立方根和这个数同号,0的立方根是0==等于()328.72A. 0.2872B. 28.72C. 2.872D. 287.24.是的平方根,是64的立方根,则=()A. 3B. 7C.3,7D. 1,75.下列说法错误的是( )A. 1的平方根是±1B. −1的立方根是−1C. −3是√9的平方根D. √2是2的平方根6.若一个数的立方根是-3,则该数为()A.-33 B.-27C.±33 D.±277.一个正方体的水晶砖,体积为100 cm3,它的棱长大约在( )A.4 cm~5 cm之间B.5 cm~6 cm之间C.6 cm~7 cm之间D.7 cm~8 cm之间8.若单项式2x2y a+b与﹣x a﹣2b y5的和仍然是一个单项式,则a﹣5b的立方根为()A.﹣1 B.1 C.0 D.29.估计96的立方根的大小在( )A.2与3之间B.3与4之间C.4与5之间D.5与6之间10.正方体A的体积是正方体B的体积的27倍,那么正方体A的棱长是正方体B的棱长的() A.2倍B.3倍C.4倍D.5倍二、填空题11.若一个数的平方根是8±,则这个数的立方根是12.12.化简:38=13≈__________.(精确到百分位)14.已知x-1的立方根是1,2y+2的算术平方根是4,则x+y的平方根是.15.0+=,则a和b的关系是__________.16.若x-1是125的立方根,则x-7的立方根是__________.三、解答题17.求下列各式的值:(1)-3-0.125;(2)-3729+3512;(3)30.027-31-124125+3-0.001.18.求下列各式中x的值.(1)9x2=121(2)(x+1)3=27.19.已知x−2的算术平方根是3,2x−y+12的立方根是1,求x+y的值.20.解答下列应用题:⑴某房间的面积为17.6 m2,房间地面恰好由110块相同的正方形地砖铺成,每块地砖的边长是多少?⑵已知第一个正方体水箱的棱长是60 cm,第二个正方体水箱的体积比第一个水箱的体积的3倍还多81 000 cm3,则第二个水箱需要铁皮多少平方米?=0,求3m+6n的立方根.21.若√2m+n+|m2√3−m参考答案:一、选择题1.下列说法正确的是( D )A.如果一个数的立方根是这个数本身,那么这个数一定是0B.一个数的立方根不是正数就是负数C.负数没有立方根D.一个不为零的数的立方根和这个数同号,0的立方根是02.下列说法正确的是(D)A.如果一个数的立方根是这个数本身,那么这个数一定是0B.一个数的立方根不是正数就是负数C.负数没有立方根D.一个不为零的数的立方根和这个数同号,0的立方根是0==等于( A )328.72A. 0.2872B. 28.72C. 2.872D. 287.24.是的平方根,是64的立方根,则=( D )A. 3B. 7C.3,7D. 1,75.下列说法错误的是(C)A. 1的平方根是±1B. −1的立方根是−1C. −3是√9的平方根D. √2是2的平方根6.若一个数的立方根是-3,则该数为(B)A.-33 B.-27C.±33 D.±277.一个正方体的水晶砖,体积为100 cm3,它的棱长大约在( A )A.4 cm~5 cm之间B.5 cm~6 cm之间C.6 cm~7 cm之间D.7 cm~8 cm之间8.若单项式2x2y a+b与﹣x a﹣2b y5的和仍然是一个单项式,则a﹣5b的立方根为( A )A.﹣1 B.1 C.0 D.29.估计96的立方根的大小在( C )A.2与3之间B.3与4之间C.4与5之间D.5与6之间10.正方体A的体积是正方体B的体积的27倍,那么正方体A的棱长是正方体B的棱长的(B) A.2倍B.3倍C.4倍D.5倍三、填空题11.若一个数的平方根是8 ,则这个数的立方根是_____4_____ .12.化简:38= 213≈__________.(精确到百分位)【答案】2.9214.已知x -1的立方根是1,2y +2的算术平方根是4,则x +y 的平方根是±3 .15.0+=,则a 和b 的关系是__________.【答案】互为相反数16.若x-1是125的立方根,则x-7的立方根是__________.【答案】-1三、解答题17.求下列各式的值:(1)-3-0.125;解:原式=0.5.(2)-3729+3512;解:原式=-9+8=-1.(3)30.027-31-124125+3-0.001.解:原式=0.3-31125+(-0.1)=0.3-15-0.1=0.18.求下列各式中x 的值.(1)9x 2=121(2)(x +1)3=27.解:(1)由题意得:x 2=1219, ∴x =±113.(2)由题意可知x +1=3,解得x =2.19.已知x −2的算术平方根是3,2x −y +12的立方根是1,求x +y 的值.解:根据题意,得x −2=9,2x −y +12=1,解得x =11,y =33; ∴x +y =44.20.解答下列应用题:⑴某房间的面积为17.6 m 2,房间地面恰好由110块相同的正方形地砖铺成,每块地砖的边长是多少?⑵已知第一个正方体水箱的棱长是60 cm ,第二个正方体水箱的体积比第一个水箱的体积的3倍还多81 000 cm 3,则第二个水箱需要铁皮多少平方米?解:(1)每块地砖的面积为17.6÷110=0.16(㎡) 所以正方形地砖的边长为4.016.0 ,答:每块地砖的边长是0.4m.(2)由题意可知,第一个正方体水箱的体积为603=21600(cm 3).所以第二个正方体水箱的体积为3×21600+81000=729000(cm 3); 所以第二个正方体水箱的棱长为3729000=90cm ;所以需要铁皮90×90×6=48600cm 2=4.86m 2.21.若√2m+n+|m 2√3−m =0,求3m +6n 的立方根.解:∵√2m+n+|m 2√3−m =0, ∴√2m +n =0,|m 2−9|=0,3−m ≠0,解得m =−3,n =6,∴3m +6n 的立方根为3.6.3 实数(满分120分;时间:120分钟)一、 选择题 (本题共计 10 小题 ,每题 3 分 ,共计30分 , )1. 在下列各数中:227,√2,−π,√−273,3.1415926,√289,0.1010010001…,其中无理数的个数为( )A.3B.4C.5D.62. 下列各组数的比较中错误的是()A.−π<−2B.√5>1.7C.12>√5−12D.π>3.143. 下列各数中是正整数的是()A.−1B.2C.0.5D.√24. −√3在数轴上对应的点为()A.点EB.点FC.点GD.点H5. √7的点在数轴上表示时,应在哪两个整数之间()A.1与2B.2与3C.3与4D.4与56. 下列说法中正确的是()A.√9=±3B.√(−3)33=−3C.√2+√5=√7D.2√3−√3=17. 如图,数轴上的点A、B、C、D分别表示数−1、1、2、3,则表示2−√5的点P应在()A.线段AO上B.线段OB上C.线段BC上D.线段CD上8. 已知a为整数,且√3<a<√5,则a等于()A.1B.2C.3D.49. 下列运算中,错误的是()A.√2×√3=√6B.√(−5)2=−5C.2√2+3√2=5√2D.√2=√2210. 若实数a 、b 、c 在数轴上对应点的位置如下图所示,则|c|−|b +a|+|b −c|等于( )A.−a −2cB.−a +2bC.−aD.a −2b二、 填空题 (本题共计 10 小题 ,每题 3 分 ,共计30分 , )11. 比较大小:2√7________4√2.12. 写出一个比−3大的无理数是________.13. √5的相反数是________;√16的平方根是________.14. 计算:√48−|2√3−4|=________.15. 点A 在数轴上和表示1的点相距√6个单位长度,则点A 表示的数为________.16. 请写出一个比1大且比3小的无理数:________.17. 若|x −√3|=|−√12|,则x =________.18. 22000是一个p 位数,52000是一个q 位数,那么p +q =________.19. 比较大小:√n +1−√n ________√n −√n −1(填“>“或“<“)20. 观察一组等式的规律:1×3+1=22,2×4+1=32,3×5+1=42,4×6+1=52……,则第n 个等式为:________.三、 解答题 (本题共计 6 小题 ,共计60分 , )21. 把下列各题分别填入所属的集合中:3.14159,2.5˙,−√0.9,√−13,227,2π,0,√8,√(−8)2分数:( )无理数:( )非负整数:( ).22. 计算:(1)−√1916+√(−2)2;(2)−√6.25+√0.52−√1−18273.23. 观察下列等式:①1−12=11×2②12−13=12×3③13−14=13×4④14−15=14×5;…(1)猜想并写出第n个算式:________(2)我们规定:分子是1,分母是正整数的分数叫做单位分数,任意一个真分数都可以表示成不同的单位分数的和的形式,且有无数多种表示方法,根据上面的结论,请将真分数17表示成不同的单位分数的和的形式(写出一种即可)24. 回答下列问题.(1)在下面的数轴上作出表示√10的点A;(2)比较√10与3.2的大小,并说明理由.25.阅读下面的文字,解答问题.大家都知道√2是无理数,而无理数是无限不循环小数,因此√2的小数部分我们不可能写出来,于是小明用√2−1来表示√2的小数部分.事实上,小明的表示方法是有道理的,因为√2的整数部分是1,用这个数减去其整数部分,差就是小数部分,所以√2−1是√2的小数部分.请解答:(1)你能求出√5+2的整数部分a和小数部分b吗?并求ab的值;(2)已知10+√3=x+y,其中x是整数,且0<y<1,请求出x−y的相反数.26. 定义:如果一个数的平方等于−1,记为i2=−1,这个数i叫做虚数单位,那么和我们所学的实数对应起来就叫做复数,表示为a+bi(a,b为实数),a叫做这个复数的实部,b叫做这个复数的虚部,它的加、减、乘法运算与整式的加、减、乘法运算类似. 例如,计算:(1+2i)+(2−3i)=(1+2)+(2−3)i=3−i;(1+2i)−(2−3i)=(1−2)+[2−(−3)]i=−1+5i;(1+2i)×(2−3i)=1×2+1×(−3i)+2i×2+2i×(−3i)=2−3i+4i−6i2=8+i.(1)填空:i3=,i4= .(2)计算:(3+i)2.参考答案一、选择题(本题共计 10 小题,每题 3 分,共计30分)1.【答案】A【解答】解:无理数常见的三种类型:(1)开不尽的方根,如√7等;(2)特定结构的无限不循环小数,如2.010010001…(两个1之间依次多一个0);(3)含有π的绝大部分数,如1π.又√−273=−3,√289=17,故题中√2,−π,0.1010010001…,是无理数.故选A.2.【答案】C【解答】解:π≈3.141,√5≈2.23,A、两个负数,绝对值大的反而小,故选项正确;B、1.7=√2.89<√5,故选项正确;C、√5−12≈2.23−12≈0.61>12,故选项错误;D、π≈3.1415>3.14,故选项正确.故选C.3.【答案】B【解答】解:A、−1是负整数;故本选项错误;B、2是正整数,故本选项正确;C、0.5是小数,故本选项错误;D、√2是无理数,故本选项错误;故选B.4.【答案】B【解答】解:∵1<3<4,∴1<√3<2,∴−2<√3<−1,∴由图示知,点F符合题意.故选B.5.【答案】B【解答】解:∵√4<√7<√9,∴√7应在2与3之间.故选B.6.【答案】B【解答】解:A、√9=3,故选项错误;3=−3,故选项正确;B、√(−3)3C、√2+√5不能合并,故选项错误;D、2√3−√3=√3,故选项错误.故选B.7.【答案】A【解答】解:2<√5<2.5.由不等式的性质,得−2.5<−√5<−2,−0.5<2−√5<0.故选:A.8.【答案】B【解答】解:∵√3<a<√5,∴ 3<a2<5,∵ a为整数,a2=4,∴ a=2.故选B.9.【答案】B【解答】解:A、√2×√3=√6,故选项正确;B、∵√(−5)2=√25=5,故选项错误;C、2√2+3√2=5√2,故选项正确;D、√2=√22,故选项正确.故选B.10.【答案】A【解答】解:由图知,c<b<0<a,|b|<|c|<|a|,|c|−|b+a|+|b−c|=−c−b−a+ b−c=−a−2c.故选A.二、填空题(本题共计 10 小题,每题 3 分,共计30分)11.【答案】<【解答】解:2√7=√28,4√2=√32,∵28<32,∴√28<√32,∴2√7<4√2.故答案为:<.12.【答案】π【解答】解:写出一个比−3大的无理数是π(答案不唯一).故答案为:π.13.【答案】−√5,±2【解答】解:√5的相反数是−√5;∵√16=4,4的平方根是±2,∴√16的平方根是±2.故答案为:−√5;±2.14.【答案】6√3−4【解答】原式=4√3−(4−2√3)=6√3−4.15.【答案】1+√6或1−√6【解答】解:在数轴上和表示1的点相距√6个单位长度的点有两个,点A为1+√6或1−√6.故答案为:1+√6或1−√6.16.【答案】√2(答案不唯一)【解答】解:如:√2,√5(答案不唯一).故答案为:√2(答案不唯一).17.【答案】3√3或−√3【解答】解:由|x−√3|=|−√12|,得x−√3=2√3或x−√3=−2√3,解得x=3√3或x=−√3,故答案为:3√3或−√3.18.【答案】2001【解答】解:∵22=4,是1位数,52=25,是2位数,此时p+q=3=2+1,23=8,是1位数,53=125,是3位数,此时p+q=4=3+1,…,∴若22000是一个p位数,52000是一个q位数,那么p+q=2000+1=2001.故答案为:2001.19.【答案】<【解答】∵√n−1有意义,∴n−1≥0,∴n≥1,∴当n=1时,√n+1−√n=√2−1=0,√n−√n−1=1,0<1;当n=2时,√n+1−√n=√3−√2≈1.7−1.4=0.3,√n−√n−1=√2−1≈1.4−1=0.4,0.3<0.4;当n=3时,√n+1−√n=2−√3≈2−1.73=0.27,√n−√n−1=√3−√2≈1.73−1.41=0.32,0.27<0.32;…,综上所述,当n=k时,√k+1−√k<√k−√k−1,20.【答案】n(n+2)+1=(n+1)2【解答】解:∵1×3+1=22,2×4+1=32,3×5+1=42,4×6+1=52,……,∴第n个等式为:n(n+2)+1=(n+1)2.故答案为:n(n+2)+1=(n+1)2.三、解答题(本题共计 6 小题,每题 10 分,共计60分)21.【答案】解:分数(3.14159,2.5˙,227 )无理数(−√0.9,2π,√8)非负整数(0,√(−8)2).【解答】解:分数(3.14159,2.5˙,227 )无理数(−√0.9,2π,√8)非负整数(0,√(−8)2).22.【答案】解:(1)原式=−√2516+√4=−54+2=34.(2)原式=−2.5+0.5−√−8273=−2−(−23)=−43.【解答】解:(1)原式=−√2516+√4=−54+2=34.(2)原式=−2.5+0.5−√−8273=−2−(−23)=−43. 23.【答案】1n −1n +1=1n(n +1)(2)17=114+121+142.【解答】解:(1)观察,发现规律:①1−12=11×2,②12−13=12×3,③13−14=13×4,④14−15=14×5,…,∴ 第n 个算式为:1n −1n+1=1n(n+1).(2)17=114+121+142.24.【答案】解:(1)如图,(2)∵(√10)2=10,3.22=10.24,且10<10.24,∴√10<3.2.【解答】解:(1)如图,(2)∵(√10)2=10,3.22=10.24,且10<10.24,∴√10<3.2.25.【答案】解:(1)∵4<5<9,∴2<√5<3.∴4<√5+2<5.∴a=4,b=√5+2−4=√5−2.∴ab=4×(√5−2)=4√5−8.(2)∵1<3<4,∴1<√3<2.∴11<10+√3<12.∴x=11,y=10+√3−11=√3−1.∴x−y=11−(√3−1)=12−√3.∴x−y的相反数为√3−12.【解答】解:(1)∵4<5<9,∴2<√5<3.∴4<√5+2<5.∴a=4,b=√5+2−4=√5−2.∴ab=4×(√5−2)=4√5−8.(2)∵1<3<4,∴1<√3<2.∴11<10+√3<12.∴x=11,y=10+√3−11=√3−1.∴x−y=11−(√3−1)=12−√3.∴x−y的相反数为√3−12.26.【答案】解:(1)i3=i⋅i⋅i=i2⋅i=−i,i4=i⋅i⋅i⋅i=i2⋅i2=(−1)×(−1)=1;解:(2)(3+i)2=9+6i+i2=9+6i−1=8+6i. 【解答】解:(1)i3=i⋅i⋅i=i2⋅i=−i,i4=i⋅i⋅i⋅i=i2⋅i2=(−1)×(−1)=1;解:(2)(3+i)2=9+6i+i2=9+6i−1=8+6i.。
一年级数学随堂练习题答案
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一年级数学随堂练习题答案【题目一】数的认识1. 从1数到10,然后从10倒数到1。
2. 填空题:5后面是(),10前面是()。
3. 判断题:8比7大1,6比8小2。
()【答案一】1. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10;10, 9, 8, 7, 6, 5, 4, 3, 2, 1。
2. 6,93. √,×【题目二】加法和减法1. 计算下列各题:- 3 + 2 =- 5 - 3 =2. 应用题:小明有5个苹果,他给了小红2个,小明现在还有几个苹果?【答案二】1. 5,22. 3个苹果【题目三】图形的认识1. 判断题:正方形有4个角,都是直角。
()2. 填空题:圆形有()个角。
【答案三】1. √2. 0【题目四】时间的认识1. 填空题:一天有()小时。
2. 应用题:如果现在是上午9点,3小时后是几点?【答案四】1. 242. 中午12点【题目五】比较大小1. 比较下列数字的大小:- 7 和 9- 4 和 62. 应用题:小华有7个气球,小刚有9个气球,谁的气球多?【答案五】1. 9 > 7,6 > 42. 小刚的气球多【题目六】排序问题1. 将下列数字从小到大排列:- 3,1,5,22. 应用题:小丽、小明和小强分别有3个、5个和2个玩具,他们按照玩具数量从少到多排列。
【答案六】1. 1,2,3,52. 小强,小丽,小明【题目七】简单应用题1. 小红有10支铅笔,她给了小华3支,自己还剩多少支?2. 学校里有15个学生,如果每个学生都带一个苹果,学校需要准备多少个苹果?【答案七】1. 7支2. 15个苹果【结束语】小朋友们,通过这些练习题,我们可以更好地掌握一年级数学的基本知识和技能。
希望你们能够认真练习,不断提高自己的数学能力。
如果有任何问题,记得及时向老师或家长求助哦!。
二年级智慧随堂练下册语文全部答案
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二年级智慧随堂练下册语文全部答案1、下列词语中,加着重号字的注音正确的一项是()[单选题] *A、将进酒(qiāng)岑夫子(chén)欢谑(xuè)馔玉(zhuàn)B、虾蟆陵(há)贾人(jiǎ)钿头(diàn)荻花(dí)C、樯橹(qiáng)酹(lèi) 凝噎(yè)兰舟催发(fà)D、郯子(tán)六艺经传(zhuàn)或不焉(fǒu)句读(dòu)(正确答案)2、下列词语中,加着重号字的注音不正确的一项是()[单选题] *A、精湛(zhàn)竣工(jùn)眷属(juàn)B、书籍(jí)违背(wéi)拜谒(yè)C、喘息(quǎn)祭祀(sì)糟粕(pà)(正确答案)D、抵御(yù)阴霾(mái)束缚(fù)3、下列选项中加着重号字注音正确的一项是()[单选题] *A、气喘quǎn 包裹guóB、脱缰jiāng 监视jiān(正确答案)C、抵挡dāng 怨恨yuānD、凫水fù跳跃yào4、1“青出于蓝而胜于蓝”这句格言出自于荀子的《劝学》。
[判断题] *对(正确答案)错5、23. 下列对传统文化常识的表述不正确的一项是()[单选题] *A.冬奥会展示了我国“二十四节气”,清明是“二十四节气”之一,也是我国的传统节日。
B.《诗经》是我国最早的一部诗歌总集,也是我国诗歌浪漫主义传统的源头。
(正确答案) C.“记”是古代一种文体,通过记事、记物、记人、记景来抒发作者的感情或见解。
D.小旦、小生、小丑都是戏曲行当,分别扮演年轻女子、年轻男子、滑稽人物。
6、下列选项中加着重号字的注音或解释,有错误的一项是()[单选题] *A、跫(qióng)音春帷(帷幕)窗扉(门)B、炫(xuàn)耀慰藉(jiè)归(回家)人C、威仪(外貌仪表)相融(róng)向(对着)晚(正确答案)D、红硕(大)霹雳(lì)虹霓(ní)7、19.下列词语中加点字字音有误的一项是()[单选题] *A.附和(hè)炫耀(xuàn)哺育(bǔ)仓皇逃窜(cuàn)B.山涧(jiān)冗杂(rǒng)门框(kuàng)潜心贯注(qiǎn)(正确答案)C.粗拙(zhuō)藻饰(zǎo)狼藉(jí)春寒料峭(qiào)D.选聘(pìn)遏制(è)斟酌(zhēn)颠沛流离(pèi)8、1演讲又称演说或讲演。
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随堂练(九)答案
1. C ( 解析]原句的破折号起到对,上句补充修饰的作用。
A项,引出对事情原因的解释;B项,对上句的具体解释;C项,对上句的补充和修饰;D项,语意的跳跃。
2.①文中运用拟人的手法,将灯当作人来写,将灯赋予了人的特点与情感;(2分)②更为生动形象地体现出了夜晚的秦淮河迷蒙、柔美、光影交错的特点。
(2分)
3.①原句“凄怀”和“低唱”单独成句,起到强调、突出的作用,更能体现作者的情感;(2分)②原文句式更整齐,更有节奏感与音韵感,也与上文语体-致,语言风格更统- - -。
(2 分)
4.(1)语句②修改为:“8月中国出口继续超预期增长,同比增速升至年内最高。
”
(2)语句③修改为:“根据海关总署9月7日发布的数据”或者“海关总署9月7日发布的数据显示。
(3)语句⑥修改为:“进口同比则下降50%。
”
(4)语句①修改为:“比7月减少将近132. 5亿美元”或“比7月减少132. 5亿美元左右。
”
随堂练(十)答案
1、 C
2、C(A、感叹号应放在引号内。
B、“批评起来”后面的冒号改为逗号。
D、“荡胸生层云”后面的逗号改句号,表示完整的一句话)
3、B
4、A
5、①9月7日,②国际奥委会协调委员会主席科茨表示,③不管有没有新冠病毒,④东京
奥运会将于明年7月23日开幕,⑤具体比赛日程和比赛场地已全部确定。