精讲通关40

1H414052电梯工程安装要求一、《电梯工程施工质量验收规范》GB50310～2002的要求及适用范围1．该规范强化电梯安装工程质量验收要求，明确验收检验项目，把涉及电梯安装工程质量、安全及环境保护等方面的内容，作为主控项目要求；3．《电梯工程施工质量验收规范》的适用范围。

1)该规范适用于曳力驱动的曳引式或强制式电梯、液压电梯、自动扶梯和自动人行道安装工程质量的验收；不适用于杂物电梯安装工程质量的验收。

3)该规范是对电梯安装工程质量的最低要求，所规定的项目都必须达到合格。

二、电梯安装工程分部、子分部、分项工程的划分电梯安装工程分部、子分部、分项工程的划分表1H414052三、电力驱动的曳引式或强制式电梯安装要求1．设备进场验收电梯进场验收时，验收人员发现没有限速器的型式试验证书复印件，应在设备验收记录上记录清楚，并要求电梯供应商提供。

2．土建交接检验的验收要求土建施工单位、安装单位、建设（监理）单位共同对土建工程进行交接验收。

(2)机房（如果有）内应设有固定的电气照明，机房的电源零线和接地线应分开，机房内接地装置的接地电阻值不应大于4Ω。

(5)电梯安装之前，所有厅门预留孔必须设有高度不小于1200mm的安全保护围封（安全防护门），并应保证有足够的强度，保护围封下部应有高度不小于l00mm的踢脚板，并应采用左右开肩方式，不能上下开启。

(6)当相邻两层门地坎间的距离大于llm时，其间必须设置井道安全门。

(7)井道内应设置永久性电气照明，井道照明电压宜采用36V安全电压，井道内照度不得小于5m，井道最高点和最低点0.5m内应各装一盏灯，中间灯间距不超过7m，并分别在机房和底坑设置控制开关。

10．电气装置安装要求(1)所有电气设备及导管、线槽的外露可以导电部分应当与保护线(PE)连接，接地支线应分别直接接至接地干线的接线柱上，不得互相连接后再接地。

(2)导体之间和导体对地之间的绝缘电阻必须大于1000Ω，且其值不得小于：①动力电路和电气安全装置电路：0.5Ω；②其他电路（控制、照明、信号等）：0.25Ω。

苇航教育2020年二建市政课程2K312022 桩基础施工方法与设备选择城市桥梁工程常用的桩基础通常可分为沉入桩基础和灌注桩基础，按成桩施工方法又可分为：沉入桩、钻孔灌注桩、人工挖孔桩一、沉入桩基础常用的沉入桩有钢筋混凝土桩、预应力混凝土管桩和钢管桩。

（一）沉桩方式及设备选择(1)锤击沉桩宜用于砂类土、黏性土。

桩锤的选用应根据地质条件、桩型、桩的密集程度、单桩竖向承载力及现有施工条件等因素确定。

(2)振动沉桩宜用于锤击沉桩效果较差的密实的黏性土、砾石、风化岩。

(3)在密实的砂土、碎石土、砂砾的土层中用锤击法、振动沉桩法有困难时，可采用射水作为辅助手段进行沉桩施工。

在黏性土中应慎用射水沉桩；在重要建筑物附近不宜采用射水沉桩。

(4)静力压桩宜用于软黏土（标准贯入度N<20）、淤泥质土。

(5)钻孔埋桩宜用于黏土、砂土、碎石土，且河床覆土较厚的情况。

（二）准备工作(2)沉桩前必须处理地上（下）障碍物，平整场地，且应满足沉桩所需的地面承载力。

(3)应根据现场环境状况采取降噪声措施；城区、居民区等人员密集的场所不应进行沉桩施工。

(4)对地质复杂的大桥、特大桥，为检验桩的承载能力和确定沉桩工艺应进行试桩。

(5)贯入度应通过试桩或做沉桩试验后会同监理及设计单位研究确定。

（二）施工技术要点(1)预制桩的接桩可采用焊接、法兰连接或机械连接，接桩材料工艺应符合规范要求。

(2)沉桩时，桩帽或送桩帽与桩周围间隙应为5~10mm；桩锤、桩帽或送桩帽应和桩身在同一中心线上；桩身垂直度偏差不得超过0.5%。

(3)沉桩顺序：对于密集桩群，自中间向两个方向或四周对称施打；根据基础的设计高程，宜先深后浅；根据桩的规格，宜先大后小，先长后短。

(4)施工中若锤击有困难时，可在管内助沉。

(5)终止锤击的控制应以控制桩端设计高程为主，贯入度为辅。

(6)沉桩过程中应加强邻近建筑物、地下管线等的观测、监护。

【导语】新概念英语作为家喻户晓的经典之作，它有着全新的教学理念，有趣的课⽂内容及其全⾯的技能训练，为⼴⼤的英语学习者提供帮助！如果你也想学好英语，⼜怎能错过新概念英语？下⾯为您提供了相关内容，希望对您有所帮助！新概念英语第三册课⽂重点精讲解析Lesson40 1.It has never been explained why university students seem to enjoy practical jokes more than anyone else. 背诵句型 It为形式主语. 2.Inviting the fire brigade to put out a nonexistent fire is a crude form of deception which no self-respecting student would ever indulge in. 背诵句型 put out 扑灭,熄灭. indulge in 沉迷于 Ex：Many old people indulge in reminiscences of their youth. 3. As soon as he had hung up, he went over to the workmen and told them that if a policeman ordered them to go away, they were not to take him seriously. As soon as ⼀...就... hung up 挂上电话 go away ⾛开 take him seriously 严肃对待 be to do 结构含义： （1）should Eg: Such a private thing should be avoided. Such a private thing is to be avoided （2）must Eg: No students must leave school without the permission of the police. No students are to leave school without the permission of the police. （3）intend 意图，打算 Eg: We intend to start work next week. We are to start work next week. 4.Both the police and the workmen were grateful to the student for this piece of advance information. 背诵句型 were grateful to sb for sth 因...⽽感激/感谢 Ex：His parents were very grateful to us for informing them of his safe return. 5.When he received a very rude reply from one of the workmen, he threatened to remove them by force. 背诵句型 threatened to 恐吓要做某事 by force 以武⼒ 6.The workmen told him to do as he pleased and the policeman telephoned for help. 背诵句型 as he pleased 此句为⽅式状从,省略了 to do 7. Shortly afterwards, four more policemen arrived and remonstrated with the workmen. remonstrated with + 表⽰⼈的名词规劝... remonstrated with sb. about/ regarding/ upon/ on sth. 因...⽽规劝某⼈ Ex：His parents remonstrated with him about his bad habits. 8.At this, the police pointed out ironically that this would hardly be necessary as the men were already under arrest. 背诵句型 as this 听到 at 是介词,表⽰"⼀...(就)..." 此意思为"⼀听到这话". this 指代其中⼀个⼯⼈威胁要去叫警察这件事. Ex： At the words,he got angry. With the words, he left the room angrily. pointed out ironically 讽刺地指出 hardly be necessary ⼤可不必 under 与名词搭配表⽰⼀种被动的概念 under discussion / arrest / repair 9.Pretending to speak seriously, one of the workmen asked if he might make a telephone call before being taken to the station. 背诵句型 Pretending to 假装做... make a telephone call 打个电话 10. Permission was granted and a policeman accompanied him to a pay phone. 背诵句型 11.Only when he saw that the man was actually telephoning the police did he realize that they had all been the victims of a hoax. Only when 直到...才... Only 为副词,起强调作⽤. 只有当Only +状语这样的结构在句⾸时,句⼦(或主句) 的谓语部分才需要使⽤倒装的语序. Ex： Only if you've been through such agony will you believe it. From a scientific point of view, work is done only when the applied force produces motion.新概念英语第三册课⽂重点精讲解析Lesson41 1.City born and city bred. I have always regarded the country as something you look at through a train window, or something you occasional visit during the weekend. City born and city bred 是两个由"名词+过去分词"构成的合成词, 做形容词使⽤. 此作原因状语. regards...as 把...视为. 相当: think of ...as / refer to ...as you look at... & you occasionally visit... 为定语从句,分别修饰前⾯的 something. 在something与两个定语从句间分别省略了关系连词 that. 2.Most of my friends live in the city, yet they always go into raptures at the mere mention of the country. 背诵句型 go into raptures 变得欣喜若狂. at the mere mention of ⼀提到 at the sight of ⼀看到 at the touch of ⼀触及到 at the news of ⼀听到 at the sound of ⼀听到 Ex：They went to reptures at the good news. 3. Even he still lives under the illusion that country life is somehow superior to town life. 背诵句型 be under the illusion 有这样的错觉,其后 that引导⼀个同位语从句. Ex： He is under the illusion that he is always right. be superior to ⽐...优越. 含⽐较之意,⽤与两⼈或两个事物之间的⽐较. be superior to 还可引伸为"不为...影响"、"拒绝"等意, ⽤于此意时,介词可⽤above 替换. Ex： He's superior to bribery. be superior to 表⽰"在...⽅⾯胜过..."时,通常使⽤be superior in... to" OR "be superior to...in ..."这结构. Ex： He felt superior in maths to John. 4.He is forever talking about the friendly people... 这⾥的副词 forever 与正在进⾏时的⼀同使⽤,表⽰作者的不满这样的感情⾊彩. always, forever, constantly, continually 等副词同进⾏时态共⽤, 除表⽰某事常发⽣外, 往往表⽰说话⼈对发⽣的此类事情的不满. 5.Nothing can be compared, he maintains, with the first cockcrow, the twittering of birds at dawn, the sight of the rising sun glinting on the trees and pastures. compared with 将...同...相⽐.⽤于两者间⽐较 cockcrow n. 鸡叫 twitter v. (鸟)吱吱叫，喊喊喳喳叫 glint v. 闪烁 glinting on the trees and pastures 为现在分词短语,在句中作宾语补⾜语. he maintains 他坚持认为. 在句中作插⼊语 6.This idyllic pastoral scene is only part of the picture. 背诵句型 idyllic adj. ⽥园诗的 Ex：He is leading an idyllic life. 7. My friend fails to mention the long and friendless winter evenings in front of the TV -- virtually the only form of entertainment. fails to mention = says nothing about 没有提到...... virtually adv. ⼏乎,差不多 friendless 此处使⽤了暗喻的修辞⼿法,⽤修饰⼈的形容词来修饰事物(winter evenings). 感觉⽣动简洁. 8. Why people are prepared to tolerate a four-hour journey each day for the dubious privilege of living in the country is beyond me. They could be saved so much misery and expense if they chose to live in the city where they rightly belong. 背诵句型 dubious adj. 可疑的;怀疑的 be dubious about/of 对...怀疑,对...不肯定，主要表⽰不肯定的，不确定的 privilege n. 特权 misery n. 苦难 beyond me = be beyond my understanding 我⽆法理解的 are prepared to 愿意做. 其后为名词时, 通常构成为be prepared for... Why 为连接副词,在本句中引导⼀个主语从句. They could be... 此句使⽤了虚拟语⽓. 可翻译为"如果他们选择...他们本可省掉..." 将此句改为主动语态后为: To live in the city could save them so much misery and expense. 句中间接宾语them作主语,⽽直接宾语misery and expense 作为宾语保留在句中. 9. If you can do without the few pastoral pleasures of the country, you will find the city can provide you with the best that life can offer. 背诵句型 do without = go without 没有...也⾏ 10. There is so much variety that you never have to make do with second best. 背诵句型 never have to =need not =don't have to make do with 凑合者⽤ 11. Some of my acquaintances in the country come up to town once or twice a year to visit the theatre as a special treat. come up : up ⽤于:由乡下到城镇,由南到北 12. As the play draws to its close draw to its close = near its end 临近结束/尾声 13. The cit dweller never experiences anxieties of this sort. 背诵句型 We can keep ourselves free from the anxieties of this sort which afflict the country dweller. 14. Country people run wild when they go shopping in the city and stagger home loaded with as many of the exotic items as they can carry. 背诵句型 run wild 发疯 15. Nor is the city without its moments of beauty. nor ... without 双重否定 The city has got its own beauty.新概念英语第三册课⽂重点精讲解析Lesson42 1.Perhaps it is the desire for solitude or the chance of making an unexpected discovery that lures people down to the depths of the earth. 背诵句型 结构分析: it is the desir e ......or the chance ......that......运⽤了强调了句式，被强调的部分是句⼦的主语:it is the desire ......or the chance eg: It is the desir for knowledge that lures her into the book world. 是她对知识的渴求吸引她⾛进书的海洋。

40种笔画精讲教程在我们日常生活中，笔画是不可或缺的一部分。

无论是书法、绘画还是文字书写，都需要熟练掌握各种不同的笔画。

今天，我们就来精讲40种常见的笔画，希望能够帮助大家更好地理解和运用它们。

1. 横：横线是最基本的笔画之一，代表着平稳和稳重。

2. 竖：竖线代表着挺拔和直立。

3. 撇：撇是向左下方倾斜的线条，笔画流畅。

4. 捺：捺则是向右下方倾斜的线条，刚劲有力。

5. 提：提是向上方延伸的线条，常见于书法中。

6. 点：点是最简单的笔画，但也是至关重要的一种。

7. 捺提：捺提是捺和提的结合，常见于书法和篆刻中。

8. 竖弯钩：竖弯钩是竖线和弯曲线的结合，形态多变。

9. 横撇钩：横撇钩是横线、撇和钩的结合，书写时需要注意笔画顺序。

10. 横折：横折是横线中加入一个折角，形象逼真。

11. 横撇提：横撇提是横撇和提的组合，常见于篆刻艺术中。

12. 撇折：撇折是撇和折的结合，线条简洁明快。

13. 撇点：撇点是撇线加上一个点，点睛之笔。

14. 撇捺：撇捺是撇和捺的组合，书写时要注意笔画顺序。

15. 撇折弯：撇折弯是撇、折和弯曲线的复合笔画，书写难度较大。

16. 提撇：提撇是提和撇的结合，形态优美。

17. 撇竖弯：撇竖弯是撇、竖和弯曲线的组合，线条流畅。

18. 弯钩：弯钩是弯曲线和钩的结合，常见于汉字中。

19. 竖弯：竖弯是竖线和弯曲线的结合，书写时要注意笔画的协调。

20. 竖钩：竖钩是竖线和钩的组合，形态独特。

21. 横弯：横弯是横线和弯曲线的结合，书写中要注意力度的掌握。

22. 横折折：横折折是横线中出现两个折角，形象生动。

23. 横折钩：横折钩是横线、折和钩的组合，书写时要有节奏感。

24. 横折弯：横折弯是横线、折和弯曲线的结合，形态独特。

25. 横撇捺：横撇捺是横线、撇和捺的组合，书写要点要清晰。

26. 横撇折：横撇折是横线、撇和折的结合，线条流畅。

27. 横撇弯：横撇弯是横线、撇和弯曲线的复合笔画，书写难度较大。

英语四级阅读模拟训练附答案和精讲第40篇:梦Of all the components of a good night's sleep, dreams seem to be least within our control. In dreams, a window opens into a world where logic is suspended and dead people speak. A century ago, Freud formulated his revolutionary theory that dreams were the disguised shadows of our unconscious desires and fears; by thelate 1970s, neurologists had switched to thinking of them as just "mental noise"-the random byproducts of the neural repair work that goes on during sleep. Now researchers suspect that dreams are part of the mind's emotional thermostat, regulating moods while the brain is "off line." And one leading authority says that these intensely powerful mental events can be not only harnessed but actually brought under conscious control, to help us sleep and feel better. "It's your dream," says Rosalind Cartwright, chair of psychologyat Chicago's Medical Center, "if you don't like it, change it."he link between dreams and emotions shows up among the patients in Cartwright's clinic. Most people seem to have more bad dreams early in the night, progressing toward happier onesbefore awakening, suggesting that they are working through negative feelings generated during the day. Because our conscious mind is occupied with daily life we don't always think about the emotional significance of the day's events-until, it appears, we begin to dream.And this process need not be left to the unconscious. Cartwright believes one can exercise conscious control over recurring bad dreams. As soon as you awaken, identify what is upsetting about the dream. Visualizehow you would like it to end instead; the next time it occurs, try to wake up just enough to control its course. With much practice people can learn to, literally, do it in their sleep.At the end of the day, there's probably little reason to pay attention to our dreams at all unless they keep us from sleeping or "we wake up in panic," Cartwright says. Terrorism, economic uncertainties and general feelings of insecurity have increased people's anxiety. Those suffering from persistent nightmares should seek help from a therapist. For the rest of us, the brain has its ways of working through bad feelings.Sleep-or rather dream-on it and you'll feel better in the morning.练习题：Choose correct answers to the question:1.By saying that “dreams are part of the mind's emotional thermostat," (Lines 4-5, Para. 1) the researchers mean that _______.A.we can think logically in the dreams tooB.dreams can be brought under conscious controlC.dreams represent our unconscious desires and fearsD.dreams can help us keep our mood comparatively stable2.What did Cartwright find in her clinic?A.Most bad dreams were followed by happier ones.B.Divorced couples usually have more bad dreams.C.One’s dreaming process is related to his emotion.D.People having negative feelings dream more often.3.Cartwright believed with much practice，we can learn to _____.A.control what dreams to dreamB.sleep well without any dreamsC.wake up in time to stop the bad dreamsD.identify what is upsetting about the dreams4.The author points out that a person who has constant bad dreams should ______A.learn to control his dreamsB.consult a doctorC.sleep and dream on itD.get rid of anxiety first5.The author most probably thinks that controlling dreams is ______.A.a good practiceB.a new discoveryC.helpful for everyoneD.not essential for everyone1.[D] 词义理解题。

发明的40个原理精讲1.达芬奇原理：运用多角度思考，寻找更多的解决方案。

2.墨菲定律：事情有可能出错时，总会出错。

3.帕金森法则：工作会膨胀到填满所有可用的时间。

4.巴顿原则：集中优势兵力，以优势力量解决问题。

5.波斯顿矩阵原则：通过将项目划分为四个象限，进行任务优先级排序。

6.蝴蝶效应：微小变化可能会导致巨大影响。

7.奥卡姆剃刀：对于一个问题，应选择最简单的解决方案。

8.哥哥尔顿准则：深入了解问题的根源，提出持久有效的解决方案。

9.韦伯法则：组织的权力必须与其责任相匹配。

10.布鲁姆法则：学习目标应该是可观察和可测量的。

11.斯特鲁普效应：人们在相冲突的信息之间做出选择时，可能会发生困惑。

12.多默法则：越简单的解决方案越有可能是正确的。

13.门诺定律：事物的质量与其数量成反比。

14.梅特卡夫法则：正确的决策需要准确和完整的信息。

15.赫兹斯博格定律：创新通常会遭到各种形式的抵制。

16.平衡原则：在不同的要素之间达到平衡，实现最佳效果。

17.佩特森法则：您的效率取决于您的能力和意愿。

18.拉扎孔尼定律：在任何系统中，由少数重要因素的贡献决定结果。

19.奥马计划原则：在制定计划时要考虑可能的失败。

20.霍夫施塔德定律：在问题解决过程中要充分利用已经获得的资源。

21.默克尔原理：将问题分解成较小的部分，然后逐个解决。

22.马奎尔法则：为了更好地了解问题，就要将其表达出来。

23.形势实际原则：在获得更多信息之前，暂时推迟决策。

24.弗雷泽法则：细分和灵活的组织在变革中更具竞争力。

25.洛斯定律：在决策过程中，尽可能考虑所有相关因素。

26.马克思法则：人们的行为受到其目标和动机的驱使。

27.罗森塔尔效应：预期的结果可能会影响人们的行为。

28.斯卡拉伊定律：强制执行不能单纯依赖手段，还需要威胁和奖励。

29.达什伯恩定律：无论计划多么完美，总会有问题出现。

30.莫尔定律：技术的性能每18至24个月就会翻倍。

第40 讲一题多解一、专题简析：一题多解是指从不同角度，运用不同的思维方式来解答同一道题的思考方法，经常进行一题多解的训练，可以锻炼我们的思维，使头脑更灵活。

在进行一题多解的练习时，要根据题目的具体情况，首先确定思维的起点，然后沿着不同的思考方向，就能找到不同的解题方法。

在寻求一题多解时，还应该特别选择解决问题的简便方法和最佳途径。

二、精讲精练例1：有一个正方形池塘，四周种树，每边种8 棵，每个顶点种一棵，每两棵树之间距离都相等。

四周一共种了多少棵树？练习一1、在一个正方形的菜地四周围篱笆，每个顶点插一根，每两根篱笆之间的距离相等，每边有12 根篱笆，四周一共围了多少根篱笆？2、有一个三角形花圃周围种松树，每个顶点种一棵，每边种10 棵，每两棵之间距离相等，周围一共种了多少棵？例2：一瓶花生油连瓶一共重800 克，吃掉一半油，连瓶一起称，还剩550 克。

瓶里原有多少克油？空瓶重多少克？练习二1、一袋大米，连袋共重50 千克。

吃掉一半后，连袋剩下26 千克。

大米重多少千克？袋重多少千克？2、一筐苹果连筐共重85 千克，倒去一半后，连筐共重45 千克。

苹果和筐各重多少千克？例3：甲班有42人，乙班有35人，开学时来了25 位新同学，怎样分才能使两班学生人数相等？练习三1、小明有18 枝铅笔，小红有15枝铅笔，妈妈又买来13枝铅笔，怎样分，才能使两人铅笔一样多？2、甲仓库有粮食420 吨，乙仓库有粮食370 吨，又运来粮食180 吨，怎样分，才能使两仓库粮食一样多？例4：从小青家经小红和小强家到学校有450 米，从小青家到小强家有390 米，从学校到小红家有320 米。

从小红家到小强家有多少米？练习四1、亮亮经过小明、小丹家到电影院共500 米，从亮亮家到小丹家是270米，从小明家到电影院是410 米。

从小明家到小丹家多少米？2、小敏外出旅游乘车回家，从汽车站经医院、商店到家共1000 米，从汽车站到商店是620米，从医院到家是690 米。

奥数专题
第11讲错中求解
一、知识要点
在加、减、乘、除式的计算中，如果粗心大意将算式中的一些运算数或符号抄错，就会导致计算结果发生错误。

这一周，我们就来讨论怎样利用错误的答案求出正确的结论。

二、精讲精练
【例题1】小玲在计算除法时，把除数65写成56，结果得到的商是13.还余52。

正确的商是多少？
练习1：
1.小星在计算除法时，把除数87错写成78，结果得到的商是5，余数是45。

正确的商应该是多少？
2.甜甜和蜜蜜在用同一个数做被除数。

甜甜用12去除，蜜蜜用15去除，甜甜得到的商是32还余6，蜜蜜计算的结果应该是多少？。

学而思思维创新大通关精讲一、这是啥玩意儿？简单来说，这就像是一个思维训练的宝藏秘籍。

你知道吧，咱们平时学知识，就像在平地上走路，但是做思维创新大通关里的题，那就像是突然闯进了一个神秘的思维迷宫。

而这个精讲呢，就是你在迷宫里的超级导航。

二、它为啥重要？1. 提升思维能力。

这里面的题目那可是相当有挑战性。

就好比你平时做数学题是数苹果，这个就是让你种苹果树然后算怎么能收获最多苹果的那种难度。

每一道题都像是一把小钥匙，能打开你大脑里那些还没被开发的小角落。

比如说，一道逻辑推理题，可能一开始你看着就懵圈，但是通过精讲的讲解，你就像福尔摩斯一样，学会了怎么从蛛丝马迹里找到答案。

这种思维能力可不是只在考试的时候有用，在生活中，你遇到啥复杂的事儿，都能像解数学题一样有条理地去分析。

2. 应对竞赛和挑战。

三、它的内容咋样？1. 知识点覆盖全面。

不管是数学的代数、几何，还是其他学科相关的思维知识点，它都一网打尽。

就像一个超级大的知识超市，你想要的思维训练“商品”这里都有。

比如说在数学部分，从简单的四则运算拓展到复杂的函数、方程思维，从平面几何的图形认知到立体几何的空间想象，没有它讲不到的。

2. 讲解细致入微。

这精讲可不像那种干巴巴的教科书。

它就像是一个贴心的老师在你耳边絮絮叨叨地给你讲题。

一道题，它会先告诉你这题考啥，就像给你个小提示一样。

然后呢，一步一步地带着你解题，这个步骤可详细了，就差没把手伸到你的本子上替你写了。

而且在每一步后面，还会解释为啥要这么做，就像给你吃了一颗定心丸，让你知其然还知其所以然。

四、怎么用效果最好？1. 循序渐进。

宝子们可别一上来就挑最难的部分啃，那会把你噎着的。

要从简单的开始，就像爬楼梯一样，一步一个脚印。

先把基础的思维方法掌握好了，再去挑战那些高难度的。

这样你每一步都走得稳，而且还能感受到自己一点点进步的成就感。

2. 举一反三。

做完一道题，别就扔一边不管了。

要根据精讲里的思路，自己再找类似的题目做做。