中央空调费电相关知识

中央空调费电相关知识
中央空调费电相关知识

相比普通挂式空调,人们对中央空调的了解不够多,对它的印象或许停留在“洋气”“美观”等方面。不过很多人都认为中央空调非常费电,毕竟中央空调的维修也不简单。

通常,空调的耗电量由空调的制冷功率决定,也就是空调的能耗比。

中央空调到底费不费电?主要看能效比值,接下来为你详细介绍。

家用中央空调电费很高其实是一个误解。

每个房间的室内机可以独立调节独立运行,根据使用需求单独开启,室外机可随着开启的室内机台数调节耗电量。

家用中央空调从初投资成本来看高于普通壁挂式、柜式空调,但对于多房间大户型住宅,多联机当所有室内机全开时比传统空调更为省电,长远使用成本要比普通分体空调更少。

△空调维修

当室内外温差较大时,刚开启变频空调时,会以较大功率高频运转,快速进行调节制冷,短时间耗电大。

但持续运行长时间后,房间内进入恒温状态,变频空调将比同匹数定频空调省电。

家用中央空调省不省电,看产品能效比,能效比越高,越节能;耗不耗电,看压缩机技术,IPLV越高,越省电。

空调的耗电量与制冷量有直接的关系,但代表制冷量的输出功率并不是耗电量的直接对照参数。

例如,并不是制冷量为2500W的普通1匹空调连续工作一小时需要耗电2.5度。耗电量的计算公式可用实际制冷功率乘以使用时间,但空调耗电量多少不仅与该

空调的制冷功率大小有关。

还与环境温度高低及室内温度设置的高低、房间大小及密封保温条件好坏有关。

中央空调的能耗会伴随着气温的升降而变动,盲目地设置过低或过高的温度,往往增加中央空调的能耗。

制冷时,温度设置到26度最佳,制热时,温度设置到20度左右最佳。

耗电量与室内人数、房间密闭性等多种因素有关,使用空调的房间密闭性要好,使用时窗户要关严,以保持冷气不流失。

室内人员不要频繁进出开关门,房间光照太强,白天可拉上窗帘,挡住一部分热量。

相信大家看完能够了解中央空调的运行模式,以及耗电量与哪些因素有关了。不要为了省电频繁开关机,这样会更费电。

快益修以家电、家居生活为主营业务方向,提供小家电、热水器、空调、燃气灶、油烟机、冰箱、洗衣机、电视、开锁换锁、管道疏通、化粪池清理、家具维修、房屋维修、水电维修、家电拆装等保养维修服务。

高中英语定语从句知识点及练习复习过程

高中英语定语从句知识点及练习

高中英语---定语从句 一定义及相关术语 1.定语从句:修饰某一名词或代词的从句叫定语从句。定语从句一般紧跟在它所修饰的词之后。 2.先行词:被定语从句修饰的词叫先行词。 3.关系词:引导定语从句的词叫关系词。关系词有关系代词和关系副词。关系代词有that, which, who, whom, whose, as等;关系副词有when, where, why等关系词在定语从句中有三大作用 1. 连接作用——连接先行词和定语从句。 2. 替代作用——在定语从句中替代从句所修饰的先行词。 3. 成分作用——在定语从句中作主语、宾语、定语或状语。 The man who is shaking hands with my father is a policeman. 二关系代词引导的定语从句 引导定语从句的关系代词主要有who, whom, whose, which, that等。它们分别代替前面的先行词,并在定语从句中作主语、宾语或定语。 1. who 指人,在定语从句中作主语。 That is the teacher who teaches us physics. 2. whom 指人,在定语从句中做宾语,可省略,在口语或非正式文体中常可用who 来代替。 Li Ming is just the boy (whom) I want to see. 3. which 指物,在定语从句中做主语或宾语,做宾语时常可省略。 Football is a game which is liked by most boys.

4. that 指人时,相当于who 或whom;指物时,相当于which.。在定语从句中作主语或宾语,作宾语时常可省略。 He is the man that/who lives next door. Where is the man (that/whom) I saw this morning? 、 The season that/which comes after spring is summer. The dress (that/which) Ann bought doesn’t fit her very well. 5. whose 指人、物皆可,与后面的名词有所属关系,在定语从句中做定语。 I visited a scientist whose name is known all over the country. 注意:指物时,常用以下结构来代替: The house whose windows are broken is empty. =The house the windows of which are broken is empty. Do you like the book whose cover is yellow? =Do you like the book the cover of which is yellow? 三“介词+关系代词”引导的定语从句 关系代词在从句中作介词宾语时,可以跟介词一起放在从句与主句之间(that, who不可以),也可以把介词放在从句中有关动词的后面,使关系代词紧跟它所修饰的先行词。 The school (which/that) he once studied in is very famous. =The school in which he once studied is very famous. This is the boy (whom/who/that) I played tennis with yesterday. =This is the boy with whom I played tennis with yesterday. 注意:1. 含有介词的短语动词一般不拆开,介词仍放在短语动词的后面。如:look for, look after, take care of 等。 2. 介词后的关系代词不可用that和who,若介词放在关系代词前,关系代词指人时只可用whom指物时只可用which;关系代词是所有格时用whose。

定语从句语法知识点基本汇总

定语从句 一、that引导的定语从句 1. that指人时,相当于who或whom;指物时,相当于which。 在定语从句中作主语或宾语,作宾语时常可省略。 He is the man that/who lives next door.他就是住在隔壁的那个人。 Where is the man(that/whom) I saw this morning? 我今天早上看到的那个人在哪儿?The person (that/whom) you introduced to me is very kind. 你介绍给我的那个人很友好。The season that/which comes after spring is summer.春天之后的季节是夏季。 I don’t like stories that/which have unhappy endings. 我不喜欢结尾悲伤的故事。 The dress(that/which) Ann bought doesn’t fit her very well.安买的衣服不太合身。 2.限制性定语从句中只能用that引导定语从句的情况 (1)当先行词为all, much, little, something, everything, anything, nothing, none, few, some, the one等词时。 Everything that he said was true. 他所说的一切都是真的。 There seems to be nothing that is impossible to him in the world. 对他来说似乎世界上没有什么不可能的事。 Is there anything that I can do for you? 有我能为你效劳的事吗? That’s all that I know. 我知道的就这么多。 (2)当先行词被the very(恰恰,正好)the only, any, few, little, no, all修饰时。 This is the very grammar book (that) I want to buy. 这正是我要买的语法书。 The only thing that is constant is change. 唯一不变的是变化。 There was little that we could do to help her. 我们没有什么能帮助她的。 (3)当先行词是形容词最高级或被形容词最高级修饰时。 This is the best that has been used against pollution.这是曾经用过的最好的抗污染的办法。This is the most interesting film that I've ever seen. 这是我看过的最有趣的电影。 (4)当先行词是first,last,next等序数词或被序数词修饰时。 The first place that they visited in London was the Big Ben. 在伦敦他们参观的第一个地方是大本钟。 What is the first American film that you have seen? 你看过的第一部美国电影是什么?(5)当主句的主语是疑问词who或which时。 Who that has common sense will believe such nonsense? 有常识的人谁会相信这种无聊的

高中英语定语从句知识点归纳

定语从句的连接词不可以用what. 关系词有关系代词和关系副词。关系代词有that, which, who, whom, whose, as等; 关系副词有where, when, why等。 二.关系代词引导的定语从句 指人,在从句中做主语 (1) The boys who are playing football are from Class One. … (2) Yesterday I helped an old man who lost his way. 2. whom指人,在定语从句中充当宾语,常可省略。 (1) Mr. Liu is the person (whom) you talked about on the bus. (2) Mr. Ling is just the boy whom I want to see. 注意:关系代词whom在口语和非正式语体中常用who代替,可省略。 (3) The man who/whom you met just now is my friend. / 3. which指物,在定语从句中做主语或者宾语,做宾语时可省略 (1) Football is a game which is liked by most boys. (2) This is the pen (which) he bought yesterday. 4. that指人时,相当于who或者whom;指物时,相当于which。在宾语从句中做主语或者宾语,做宾语时可省略。 (5) The number of the people that/who come to visit the city each year rises one million. (6) Where is the man that/whom I saw this morning @ 5. whose通常指人,也可指物,在定语从句中做定语 (1) He has a friend whose father is a doctor. (2) I once lived in a house whose roof has fallen in. whose指物时,常用以下结构来代替 (3) The classroom whose door is broken will soon be repaired. (4) The classroom the door of which is broken will soon be repaired. (5) Do you like the book whose cover is yellow (6) Do you like the book the color of which is yellow ^ 三.介词+关系代词引导的定语从句 关系代词在定语从句中做介词宾语时,从句常由介词+关系代词引导 (1) The school (that/which) he once studied in is very famous. (2) The school in which he once studied is very famous. (3) Tomorrow I will bring here a magazine (that/which) you asked for. (4) Tomorrow I will bring here a magazine for which you asked. (5) We”ll go to hear the famous singer (whom/that/wh o) we have often talked about. "

(完整版)定语从句最全面的知识点整理

定语从句整理 定语从句分为限定性和非限定性 1.定语从句修饰先行词 2.关系代词:that, who, whom, whose, which, as 关系副词:where, when, why 3.关系词在句中的作用1. 引导定语从句2. 代替先行词3.在定语从句中担当一个成分 4.关系代词在从句中做主语或者宾语; 5.关系副词做状语,相当于:介词+which。when是时间状语,where是地点状语,一些特殊先行词后面也用where,比如point, situation, part, condition,case 表示到了某种地步,某种程度也用where. * where和when都可以换成介词+which,但是不是所有介词+which都可以换成where或者when。 *不是所有介词都可以放在which或者whom前面,一些动词短语比如:look for, look after,take care of turn in, pay attention to, depend on, listen to就不能拆开使用,且介词后面不能用who或者that ?关于关系词的省略 1)who, whom, that, which, 做宾语时可省。 2)that做表语可省be动词后? 3)that做宾补可省? 4)*关系副词when在time, year, day后面可省,也可换成that,但不普遍 5)*关系副词where在place, 和anywhere, somewhere这种--where的后面时候 可以省略,也可换成that但不普遍 6)*关系副词why放在the reason后面,即可换成for which, that又可省略,此 较普遍。但放在a reason后面可省,但貌似不可以换成that? 7)the way后面可以用in which, that 也可省略 ?关于that ?可以用that的情况; that 在定语从句中的功能非常多 1.可以代词关系代词who, whom, which, 既可以做主语又可以做宾语,做宾语时可以省略;限从中可以说遇到关系代词就可以换成that,whose除外,因为whose 的名词所有格(。。。的)whose= of which 2.关系副词why修饰the reason可换成that,也可省。Notice:见到the reason不一定非要选why, 做宾语时候选which/that, 也可省。 3.that在某些特殊情况下代替where,when但不普遍。 4.the way后面可以用in which, that 也可省略 ?必须用that的情况(做宾语依旧可省) 1.先行词是不定代词everything, anything, nothing, 等不定代词*不含something 2.先行词被every, any, all, some, no, little, few, much等限定词修饰 3.先行词被序数词修饰the first, the second..... 4.先行词被最高级修饰the best, the most 5.先行词被the very, the most修饰时 6.先行词前面有who, which为了避免重复 7.先行词既有人又有物 8.there be句型中先行词为物常用that, 不用which

高考高中定语从句知识点汇总

定语从句知识点汇总 一、先行词 二、关系词 1.关系代词: 2.关系副词: 三、分类 1.限制性定语从句:对先行词有限制,区分的作用,并与先行词有着不可分割的关系,不能省略 2.非限制性定语从句:对先行词起补充说明的作用,可省略不会影响主句的意思,与主句用逗号隔开 3.区别: 4.非限制性定语从句的特殊情况 4.1有些既可以做限制性,又可以做非限制性的定语从句,其含义不同

There are 20 students in this class who are from the north of China. There are 20 students in this class,who are from the north of China. 5.关系代词that和关系副词why不能引导非限制性定语从句 四、关系词的用法 1.which,that which指物,在从句中作主语,宾语 that指人或物,指人可与who,whom互换;指物可与which互换 2.who,whom 从句中的介词提到关系代词词前,whom作宾语,不能用who代替 In our class there are 46 students, of whom half wear glasses. 先行词为指人的one,ones,anyone或those时,关系代词用who;双重定语从句中一个定语从句的关系代词是that,另一个指人的关系代词用who。 3.whose 表示“……的”。可指人或物。用来指物时, whose+名词=限定词+名词+of which=of which+限定词+名词 The house whose windows face south is ours. The house the window of which face south is ours.=The house of which the window face south is ours. 4.as 作为关系代词可指人或物,在从句中作主语,宾语或表语。 一般用于such...as 、the same...as 、as...as结构中,表示“像”的意思 We have found such materials as are used in their factory.

“定语从句”知识点的归纳

“定语从句”知识点的归纳 定语从句在整个句子中起着定语的作用,用来修饰名词或代词,被修饰的名词或代词叫做先行词。定语从句通常放在它所修饰的名词和代词之后。 定语从句通常由关系代词和关系副词引导. 一.关系代词有who, whom, whose, that, which等: (注意:whom, that, which在从句中作宾语时可以省略。) 1. who引导的定语从句,修饰人,代替先行词在从句中作主语: The man who came here just now is a painter. He is the student who won the first prize. A cleaner is a person who cleans streets every day . You can’t wake up a person who pretends to be asleep. 2. whom 引导的定语从句,修饰人,代替先行词在从句中作宾语: The man ( whom) my father is talking to is my English teacher. Jim is the boy (whom) I borrowed the book from. He is the person (whom) the police are looking for. 注: who在非正式英语中也可作宾语, 但可省略,例如: The man (who) you saw is Mr. Green. = The man (whom) you saw is Mr. Green. 但是, 如果引导词前面有介词时, 只能用whom, 不能用who:正: The man to whom my father is talking is my teacher. 误: The man to who my father is talking is my teacher. 3. whose引导的定语从句,可以修饰人也可以修饰物, 代 替形容词性的物主代词在从句中作定语,因此,whose的 后面通常要跟名词: A child whose parents are both dead is called an orphan. We all hate the boy whose father is very rich and has a car. Please pass me the book whose cover is green. The desk whose leg is broken is very old. 4. that 引导的定语从句,可以修饰人也可以修饰物,代替先 行词在从句中主语或宾语: Children may do something that makes their parents angry. The letter (that) I got from him was written in English. Do you know the woman that sells eggs? Is he the man (that) you are waiting for? 注: that修饰人时,分别可以who和whom替换使用. 5. which 引导的定语从句, 修饰物,代替先行词在从句中 主语或宾语: The Tea House which was written by Cao YU is my favorite. Another acronym is F2F which means face to face. The story (which) he told made us laugh. Beijing is the place which I was born in. (=Beijing is the place where I was born .) 注: which有时可以和替换that使用.

高考英语定语从句知识点知识点总复习含答案(7)

高考英语定语从句知识点知识点总复习含答案(7) 一、选择题 1.The book has helped me greatly in my daily communication, especially at work ________ a good impression is a must. A.which B.when C.as D.where 2.The past decades have witnessed China’s many scientific achievements, _____ th e development of Shenwei supercomputers is a typical example. A.to which B.for which C.at which D.of which 3.The president of Harvard pioneered the elective system______ students were able to choose their own courses of study. A.on which B.about which C.to which D.by which 4.We all have times of insecurity in life, _____ there is nothing to do but bravely face the feelings of doubt. A.which B.when C.where D.that 5.My brother bought a telescope, ______ he could study the star in the night sky. A.of which B.through which C.in which D.on which 6.The students in Shanghai are using the same textbooks _______ we are now using. A.as B.that C.which D.whose 7.We came to a place ______ they had never paid a visit before. A.in which B.to which C.what D.which 8.People often turn to china https://www.360docs.net/doc/f717577382.html,_____they’ll find valuable information regarding everything they’ll be or are going through. A.which B.where C.when D.why 9.You were really between a rock and a hard place ______ you had to choose between your career and your relationship. A.when B.where C.before D.until 10.The art festival is an annual event ______ the students can show off their talents. A.where B.that C.which D.as 11.We have entered an age _________ dreams have the best chance of coming true. A.which B.that C.when D.how 12.Search engines search the Internet based on the key words you type in, and choose such web pages for you ________ contain the words you ask for. A.where B.who C.which D.as 13.Dr. Rowan, ______ secretary resigned two weeks ago, has had to do all his own typing. A.whose B.of whom C.of which D.which 14.The other two areas ________ the two varieties differ are spelling and pronunciation. A.in that B.from which C.with which D.in which 15.I shall never forget those years _______ I spent on the farm with the farmers, _______ has a great effect on my life. A.when; who B.that; which C.which; that D.when; which 16.John invited about 40 people to his wedding, most of _______are family members.

定语从句知识点归纳

Page 1 关系词 关系副词 that which whom whose as when why who where 正确使用关系词 主语定语 状语 指 功 时间地点原因功 在以下几种场合只能用that A.先行词(指物)本身是不定代词或先行词被不定 代词修饰All that can be done has been done. B.先行词兼有指人和指物的名词 C.先行词(指物)被 the very, the only, the next, the last 等修饰 D.先行词(指物)被形容词最高级和序数词修饰 This is the best TV that is made in China. E. 当主句是which/who 引导的特殊疑问句 1、在非限制性定语从句中,指事物用which ,指人用who 或whom. 2、在介词后面,指事物用 which ,指人用whom. 在定语从句中如何正确判断与使用介词? 方法1.看定语从句中动词或形容词与介词的搭配 方法2.看从句中的动词或动词词组与先行词的搭配 方法 3、根据先行词判断,所用的介词与先行词搭配 名词/代词/数词+ of +which/whom 知多少? 名词/代词/数词+ of 表示物用which 表示人用whom 如何恰当使用when ,where , why 与which, that 引导的定语从句? 1. 先行词是表示地点,时间,原因的名词或含有地点,时间,原因意义的抽象名词,用来引导定语从句.when ,where, why 在从句中作状语 相当于相应的介词+which 2. 若定语从句缺主语或宾语,用which 或that 引导定语从句。 如何用好whose 引导的定语从句? as 和 which 的区别知多少? as 作为关系代词,既可以引导限制性定语从句,又可以引导非限制性定语从句,在从句中做主语、宾语或表语. as 引导的限制性定语从句 此时先行词前常被such,the same, so,as 修饰, 即构成such …as , the same …as, so …as, as …as 结构,做题时容易 忽略。 提示:在做有关定语从句题目时,如果选项中 出现as, 请先考虑是否考查as 引导的定语 从 句 。1、用于非限制 性 定语从句时,可以 指 as 和which 可以换用。 He left her, as/ which was strange. 2、as 引导非限制性定语从句,指代整个主句的内容,从句可置于句首,句中和句尾。 As everyone knows, Tom is good at English. 3、非限制性定语从句中谓语为被动时,常用as 作主语。as is said/ known/ announced/ reported/ mentioned/ expected/ discussed 等。 As is known to all, Taiwan is part of China. 4、as 引导非限制性定语从句,有“正如”的含义,因此,下列句式中多用as:

定语从句知识点归纳

关系词 关系副词 that which whom whose as when why who where 正确使用关系词 主语宾语表语定语 状语 指 功 时间地点原因功 在以下几种场合只能用that A.先行词(指物)本身是不定代词或先行词被不定 代词修饰All that can be done has been done. B.先行词兼有指人和指物的名词 C.先行词(指物)被 the very, the only, the next, the last 等修饰 D.先行词(指物)被形容词最高级和序数词修饰 This is the best TV that is made in China. E. 当主句是which/who 引导的特殊疑问句 1、在非限制性定语从句中,指事物用which ,指人用who 或whom. 2、在介词后面,指事物用 which ,指人用whom. 在定语从句中如何正确判断与使用介词? 方法1.看定语从句中动词或形容词与介词的搭配 方法2.看从句中的动词或动词词组与先行词的搭配 方法 3、根据先行词判断,所用的介词与先行词搭配 名词/代词/数词+ of +which/whom 知多少? 名词/代词/数词+ of 表示物用which 表示人用whom 如何恰当使用when ,where , why 与which, that 引导的定语从句? 1. 先行词是表示地点,时间,原因的名词或含有地点,时间,原因意义的抽象名词,用来引导定语从句.when ,where, why 在从句中作状语 相当于相应的介词+which 2. 若定语从句缺主语或宾语,用which 或that 引导定语从句。 如何用好whose 引导的定语从句? as 和 which 的区别知多少? as 作为关系代词,既可以引导限制性定语从句,又可以引导非限制性定语从句,在从句中做主语、宾语或表语. as 引导的限制性定语从句 此时先行词前常被such,the same, so,as 修饰, 即构成such …as , the same …as, so …as, as …as 结构,做题时容易 忽略。 提示:在做有关定语从句题目时,如果选项中 出现as, 请先考虑是否考查as 引导的定语 从 句 。 1、用于非限制性定语从句时,可以指代整个主句的内容,as 和which 可以换用。 He left her, as/ which was strange. 2、as 引导非限制性定语从句,指代整个主句的内容,从句可置于句首,句中和句尾。 As everyone knows, Tom is good at English. 3、非限制性定语从句中谓语为被动时,常用as 作主语。as is said/ known/ announced/ reported/ mentioned/ expected/ discussed 等。 As is known to all, Taiwan is part of China. 4、as 引导非限制性定语从句,有“正如”的含义,因此,下列句式中多用as:

新初中英语语法知识—定语从句的基础测试题附答案

一、选择题 1.Lily doesn’t know ________ she and her friends can do to help the little boy ________ parents have left their hometown for making money. A.that; whose B.how; who C.what; who D.what; whose 2.Behind the Ruian Square there is ________________. We often enjoy reading books. A.a museum that is open in the day time B.a library that has a lot of books C.a market which sells delicious fruit D.a restaurant which will be built in 2 years 3.Chaoyang Experimental School is the best school _______ Carl has visited in Chaoshan area. A.which B.that C.when D.where 4.Those students ____ from England like Chinese food very much. A.who is B.which are C.that is D.who are 5.—Qingdao is the most beautiful city ________ I’ve ever been to. —So it is. Many international meetings are held there every year. A.that B.which C.who D.where 6.Lily doesn’t know what she and her friends can do to help the little boy _______parents have left their hometown for making money. A.that B.who C.whom D.whose 7.Mrs. Green is proud of her daughter, a nurse ______________is hard-working and looks after patients well. A.who B.whose C.whom 8.The film _____________ I like best is Frozen. A.who B.where C.which 9.The movie ______ we saw last night was fantastic. A.that B.what C.whose D.Who 10.A detective is someone ____________looks for clues to something important. A.whom B.who C.what D.which 11.--Mary, think about before you take a trip to Harbin. --OK, I'll take some warm coats then. A.the time that you will spend B.the sights that you will visit C.the people who you will meet D.the clothes which you will bring 12.This is the small village inn ______ not long ago. A.we stayed B.where we stayed C.which we stayed D.where we stayed in 13.My favorite city is Guilin ________ is famous for it's beautiful scenery (风景). A.where B.what C.which D.who 14.This is my beautiful school _______ is near the famous library.

定语从句的相关知识点

外教一对一https://www.360docs.net/doc/f717577382.html, 定语从句的相关知识点 阅读理解 在小升初考试中,阅读类题型占据着重要的比例,那么从哪些方面提高阅读能力? 1、平时要注意积累词汇和习惯用法。阅读过程中难免会遇到生词,但大量的生词会严重影响阅读的速度,和对文章的理解的准确度。平时多积累词汇,以及习惯用法,在做题的时候可以提高对单词的辨识度,更加得心应手。 2、平时要巩固语法知识。阅读文章中涵盖有大量的语法信息,如果对语法信息不理解,有可能会造成对文章内容理解偏差。 3、阅读时要注意培养语感。语感好的人,理解力就强,阅读的速度也快。阅读时要留心词语的搭配、习惯用法。读完每一篇文章,都应总结归纳一下,积累了多少单词、惯用法和句型,这样语感自然就会好起来。 4、掌握有效的阅读技巧。比如:skimming(略读)适用于第一次阅读浏览大概内容,scanning(精读)适用于查找某段落的关键信息。这两种常见的阅读技巧,阅读时要注意加以练习,配合使用。 5、要注意养成良好的阅读习惯。阅读时要去掉杂念,心绪要安定,精神要专一,良好的阅读习惯+好的阅读技巧会让你事倍功半。 6、要注意提高阅读速度。从某个角度来说,阅读理解考的是速度,慢读是不行的。因此做阅读理解时,要注意培养自己快速阅读的习惯。 提高阅读能力,只要坚持正确的阅读方法,培养兴趣,广泛阅读,积累词汇,并且养成良好的阅读习惯,相信阅读理解能力会逐步提高的。 考试秘笈 除了平时的学习和积累,考试前的准备,以及考试过程中的方法也是至数学 攻略一:概念记清,基础夯实。数学≠做题,千万不要忽视最基本的概念、公理、定理和公式,特别是“不定项选择题”就要靠清晰的概念来明辨对错,如果概念不清就会感觉模棱两可,最终造成误选。因此,要把已经学过的四本教科书中的概念整理出来,通过读一读、抄一抄加深印象,特别是容易混淆的概念更要彻底搞清,不留隐患。 攻略二:适当做题,巧做为王。有的同学埋头题海苦苦挣扎,辅导书做掉一大堆却鲜有提高,这就是陷入了做题的误区。数学需要实践,需要大量做题,但要“埋下头去做题,抬起头来想题”,在做题中关注思路、方法、技巧,要“苦做”更要“巧做”。中考试中时间最宝贵,掌握了好的思路、方法、技巧,不仅解题速度快,而且也不容易犯错。 攻略三:前后联系,纵横贯通。在做题中要注重发现题与题之间的内在联系,绝不能“傻做”。在做一道与以前相似的题目时,要会通过比较,发现规律,穿透实质,以达到“触类旁通”的境界。特别是几何题中的辅助线添法很有规律性,在做题中要特别记牢。 攻略四:记录错题,避免再犯。俗话说,“一朝被蛇咬,十年怕井绳”,可是同学们常会一次又一次地掉入相似甚至相同的“陷阱”里。因此,我建议大家在平时的做题中就要及时记录错题,还要想一想为什么会错、以后要特别注意哪些地方,这样就能避免不必要的失分。毕竟,中考当中是“分分必争”,一分也失不得。

(完整版)高中英语定语从句知识点整理

定语从句 (一)定义及相关术语 1.定语从句:修饰某一名词或代词的从句叫定语从句。定语从句一般紧跟在它所修饰的先行词之后。 2.先行词:被定语从句修饰的词叫先行词。 3.关系词:引导定语从句的词叫关系词。 关系词有关系代词和关系副词。关系代词有that, which, who, whom, whose, as等;关系副词有when, where, why等。 关系词通常有下列三个作用:A、引导定语从句;B、代替先行词;C、在定语从句中担当一个成分。例如: The man who is shaking hands with my father is a policeman. 该句中,who is shaking hands with my father是定语从句,修饰先行词the man,“who”是引导定语从句的关系词,代替先行词the man,在定语从句中作主语。 (二)关系代词引导的定语从句 1.who 指人,在定语从句中作主语或宾语,当宾语可以省略。 ① The boys who are playing football are from Class One. 正在踢足球的男孩是一班的。 ② Those who want to go to the museum must be at the school gate at 7 tomorrow morning. 想去博物馆的人必须在明晨7点到大门口集合。 ③ Yesterday I helped an old man who had lost his way. 昨天我帮助了一位迷路的老人。 ④ That is the teacher who teaches us physics. 那就是教我们物理的老师。 2.whom 指人,在定语从句中做宾语,可省略。 ① Mr. Liu is the person ( whom ) you talked about on the bus. 刘先生就是你们在公共汽车上谈论的那个人。 ② Li Ming is just the boy ( whom ) I want to see. 李明正是我想要见的男孩。 ③ The professor ( whom ) you are waiting for has come. 你正在等的教授已经来了。 ④ The girl ( whom ) the teacher often praises is our monitor. 老师经常表扬的那个女孩是我们的班长。 注意:关系代词whom在口语或非正式文体中常可用who来代替,也可省略。 The man ( whom / who )you met just now is my old friend. 3.Which指物,在定语从句中做主语或宾语,做宾语时可省略。 ① Football is a game which is liked by most boys. 足球是大多数男孩所喜欢的运动。 ② The factory which makes computers is far away from here. 制造计算机的那家公司离这儿很远。 ③ He likes to read books which are written by foreign writers. 他喜欢外国作家写的书。 ④ The house which is by the lake looks nice. 湖边的那幢房子看上去很漂亮。 ⑤ This is the pen ( which ) he bought yesterday. 这是他昨天买的钢笔。 ⑥ The film ( which ) they went to see last night was not interesting at all.

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