高考英语数词知识点图文解析(3)

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高考英语“数词知识点” 解析

高考英语“数词知识点” 解析

高考英语“数词知识点”解析高考语法的难度加大,在考试中的比例也大大增加了,完型、阅读、写作都需要语法的熟练运用。

这里为大家整理了语法中数词的用法!一、基数词(表示数目多少或顺序先后的词叫数词)1.基数词的构成:1-10one, two, three, four, five, six, seven, eight, nine, ten;11-19eleven, twelve, thirteen, fourteen, fifteen, sixteen, seventeen, eighteen, nineteen;20-90twenty, thirty, forty, fifty, sixty, seventy, eighty, ninety;≥ 100100 a/one hundred;1,000 a/one thousand;1,000,000 a/one million;1, 000,000,000 a/one billion = a/one thousand million2. 基数词的用法1)作主语:Three will be enough for us.三个对我们来说就足够了。

Two of the girls are from Tokyo.这些姑娘中有两位来自东京。

2)作宾语:Four people applied for this job, but we only need one.四个人申请这工作,但我们仅需一人。

3)作表语:The population of China is over 1.3 billion.中国有十三亿多人口。

I’m twenty while my brother is sixteen.我二十岁,我弟弟十六岁。

4)作定语:We have 300 workers in our company.我们公司有三百名员工。

Forty students were involved in the interview. 四十名学生参加了这次采访。

2020高考英语“数词知识点”解析

2020高考英语“数词知识点”解析

3) 序数词前有形容词性物主代词、名词所有格或其他修饰语时不用任何冠词。 My first five years of childhood was spent with my grandparents. 我五岁前是和祖父母一块度过的。 Mrs. Black ’s second child is a genius. 布莱克夫人的第二个孩子是个天才。
2020年最新
高考英语“数词知识点” 解析
高考语法的难度加大,在考试中的比例也大大增加了,完型、 熟练运用。这里为大家整理了语法中数词的用法!
阅读、 写作都需要语法的
一、基数词 (表示数目多少或顺序先后的词叫数词 )
1. 基数词的构成: 1-10 one, two, three, four, five, six, seven, eight, nine, ten; 11-19 eleven, twelve, thirteen, fourteen, fifteen, sixteen, seventeen, eighteen, nineteen; 20-90 twenty, thirty, forty, fifty, sixty, seventy, eighty, ninety; ≥ 100100 a/one hundred;1,000 a/one thousand;1,000,000 a/one million;1, 000,000,000 a/one billion = a/one thousand million
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2020年最新
这台计算机的价格是那台的三倍。
2)“倍数 + the size of …” 用法与 size 相同的名词常见的有 weight (重量) ,height (高度) ,depth (深度) ,width (宽度), age(年龄), length (长度)等。 Our playground is five times the size of theirs. 我们的操场是他们的五倍大。 This street is twice/double the width of that one. 这条大街是那条大街的两倍宽。

高中英语数词用法小结(PPT)3-3

高中英语数词用法小结(PPT)3-3
两湖地区称洋芋,江浙一带称洋番芋或洋山芋,广东称之为薯仔,粤东一带称荷兰薯,闽东地区则称之为番仔薯,在鄂西北一带被称为“土豆”。 [] 英语 potato来自西班牙语patata。据西班牙皇家学院称,此西班牙词汇由泰依诺语batata(红薯)和克丘亚语papa(马铃薯)混合而来的。在拉丁美洲,“马铃薯” 的西班牙语用papa一词。 [] 历史起源 马铃薯原产于南美洲安第斯山区,人工栽培史最早可追溯到公元前8年到年的秘鲁南部地区。世纪中期,马铃薯被一个 西班牙殖民者从南美洲带到欧洲。那时人们总是欣赏它的花朵美丽,把它当作装饰品。 [] 8年英国人在加勒比海击败西班牙人,从南美搜集烟草等植物种子, 把马铃薯带到英国,英国的气候适合马铃薯的生长,比其它谷物产量高且易于管理。 [] 后来一位法国农学家——安·奥巴曼奇在长期观察和亲身实中,发现马 铃薯不仅能吃,还可以做面包等。从此,法国农民便开始大面积种植马铃薯。 [] 世纪时,马铃薯已经成为欧洲的重要粮食作物并且已经传播到中国,马铃薯 传入中国只有三百多年的历史。据说是华侨从东南亚一带引进的,在世纪中国马铃薯种植面积居世界第二位。马铃薯产量高,营养丰富,对环境的适应性较
About 50 people were present at that time. 5 用to, from--- to---,between---and表示介于数间。
His salary rises from 20 dollars to a week to n, score, hundred,thousand,million作 数词连确切数词,不用复数。如:
three score;five dozen; seven million. 四 分数的表达法
强,现已遍布世界各地,热带和亚热带国家甚至在冬季或凉爽季节也可栽培并获得较高产量。由于马铃薯非常适合在原来粮食产量极低,只能生长莜麦(裸 燕麦)的高寒地区生长,很快在内蒙古、河北、山西、陕西北部普及,马铃薯和玉米、番薯

高考英语数词专题知识点

高考英语数词专题知识点

高考英语数词专题知识点数词在英语中是一种非常重要的语法现象,常常出现在阅读理解和完形填空等题目中。

因此,对数词的掌握和理解是必不可少的。

本文将对高考英语数词专题知识点进行详细讲解,帮助同学们更好地应对数词相关题目。

一、基数词和序数词基数词是表示事物的数量或顺序的词,例如one、two、three等。

而序数词则表示事物的顺序,例如first、second、third等。

在高考英语中,基数词和序数词经常用于描述时间、日期、年龄、顺序等概念。

为了避免混淆,我们需要注意以下几点:1. 基数词通常用于单数形式,而序数词则需要用于复数形式。

例如:I have three books, and this is the first one.2. 表示年龄和序列的数字要用序数词。

例如:She is the third child in her family. He is fourteen years old.二、小数和百分数小数和百分数在高考英语中常常出现于阅读理解和数学相关的题目中。

以下是一些相关的表达方式:1. 小数:小数点后的部分可以用英语读出来。

例如0.5可以读成"zero point five"或者"nought point five"。

2. 百分数:百分号前面的数字通常是基数词,而百分号后面跟着的是分数为分子,100为分母的序数词。

例如50%可以读作"fifty percent"。

需要注意的是,当序数词与百分数连用时,百分号后面的数字要用基数词。

例如:15%是"15 percent"而不是"fifteenth percent"。

三、分数分数在高考英语中常常出现于数学相关的题目中,以下是一些常见的表达方式:1. 分数的基数词通常是基数词,可以和复数名词连用。

例如:two-thirds of the students are girls.2. 分数的序数词通常是序数词,用来表示次序。

高考英语数词所有知识点

高考英语数词所有知识点

高考英语数词所有知识点在高考英语中,数词是一个重要的语法知识点。

掌握数词的正确用法对于理解和使用英语来说至关重要。

本文将介绍高考英语中涉及的所有数词知识点,并对其用法进行详细说明。

一、基数词和序数词基数词(Cardinal Numbers)表示数量,如one、two、three等;而序数词(Ordinal Numbers)表示顺序,如first、second、third等。

基数词和序数词的用法不同,需注意以下几点:1. 基数词通常用于表示具体的数量,如"There are three books on the table."(桌子上有三本书)。

2. 序数词通常用来表示顺序或排名,如"He came in first in the race."(他在比赛中得第一名)。

二、基数词和序数词的读法在英语中,基数词和序数词的读法存在一些规则和变化,需要注意以下几点:1. 基数词一到十的读法比较固定,如one、two、three等。

2. 十以上的基数词的读法为“基数词+ty”,如eleven(十一)、twenty(二十)等。

3. 序数词的读法为“基数词+th”,如first(第一)、second(第二)等。

4. 一些特殊的基数词存在读法的变化,如three(三)在thirteen (十三)中的读法发生改变。

三、表示年龄的数词在表达人的年龄时,我们常用基数词,但有些需要特别注意的表达方式:1. "He is twenty years old."(他二十岁了。

)这里我们用基数词来表示年龄。

2. "He is in his twenties."(他二十几岁。

)这里我们用基数词的复数形式加上's来表示年龄范围。

四、表示时间的数词在表示时间的数词中,有一些特殊的表达方式需要注意:1. "It's half past ten."(现在是十点半。

高考英语新数词知识点知识点总复习含答案(3)

高考英语新数词知识点知识点总复习含答案(3)

高考英语新数词知识点知识点总复习含答案(3)一、选择题1.—What do you think of the grammar book?—Oh, it is really _____useful reference book, which is worth reading _____second time.A.a, a B.an, theC.an, a D.the, the2.—It’s reported that over 1billion people watched the live o pening ceremony of___ 2010 South Africa World Cup on TV.—Yes, news came as____ shock to me.A.the; the B.x; a C.the; a D.a; the3.— How about __________ party?—Cool! It was really __________ great fun! Pity you weren’t there.A.the; / B.a; a C.the; a D.a; /4.Mrs. Taylor has______ 8-year-old daughter who has_____ gift for painting--- she has won two national prizes.A.a; a B.an; the C.an; a D.the; a5.In more recent decades, California has become __________ home to more people from Asia. A.a B.an C.the D./6.Dr. Peter Spence, ____ headmaster of the school, told us, “____ fifth of pupils here go to study at Oxford and Cambridge.”A.a; A B.不填;The C.the; The D.不填; A7.We urge ______ extreme caution in ______ use of this medicine, which has not been officially approved yet.A.an; the B.an; 不填C.不填; the D.不填; 不填8.According to the latest survey, most students focus more on how to find ________ good job when they leave ________ college.A.a; the B.a; a C.a; 不填D.不填; 不填9.When you visit a museum you must ask for _______ permission before taking_______ photographs inside it.A./; / B.a; theC.a; / D.the; the10.When armed with ______ awareness of what you truly value, you are in ______ excellent position to pick a career you will find rewarding.A.an; an B.the; anC.an; the D.the; the11.It is often said that ______teachers have ______very simple life.A.不填;不填 B.the; a C.不填;a D.the; 不填12.With _____ help of my teacher, I have made great progress.A.the B.a C.an D./13.It's not easy for Tom to find a job, who has been in prison for many years. So he is still out of work.A.不填; a B.the; aC.不填; 不填 D.the; 不填14.The biggest whale is ________ blue whale,which grows to be about 29 meters long—the height of ________ 9-story building.A.the;the B.a;a C.a;the D.the;a15.— Of the two bags, which one do you prefer?— __________bigger one. It's_________ most beautiful one, I think.A.The; a B.The; theC.A; /D.A; the16.We went right round to the west coast by sea instead of driving across continent。

高考英语数词知识点归纳

高考英语数词知识点归纳

高考英语数词知识点归纳在高考英语考试中,数词是一个常见的知识点。

掌握好数词的用法和特点,对我们理解和使用英语语言文字有着重要的意义。

本文将对高考英语数词的知识点进行归纳总结,以帮助同学们更好地备考。

一、基本用法1. 基数词和序数词:在英语中,基数词用来表示数量,而序数词用来表示顺序。

例如,one(一)是基数词,而first(第一)是序数词。

2. 排列顺序:英语中,通常使用基数词表示时间、日期、年龄等。

例如,two days ago(两天前),the third floor(第三层)。

二、表示具体数量1. 表示具体数字的基数词:例如,one, two, three, four等。

2. 表示大量的基数词:例如,dozen(一打,12个),hundred (一百),thousand(一千)等。

3. 表示倍数的基数词:例如,double(两倍),triple(三倍),quadruple(四倍)等。

三、表示不确定数量1. 表示泛指的基数词:例如,many(许多),several(几个),a few(一些),a couple of(一对)等。

2. 表示大约数量的基数词:例如,about, around, approximately 等。

例如,约定俗成的表达法有:about a hundred(大约一百),approximately two-thirds(大约三分之二)等。

四、表达日期和年龄1. 表示日期的基数词:例如,January 1st(1月1日),May12th(5月12日)。

2. 表示年龄的基数词:例如,sixteen years old(十六岁),a five-year-old boy(一个五岁的男孩)等。

五、表示身体和尺寸1. 表示身高的基数词:例如,he is six feet tall(他身高六英尺)。

2. 表示体重的基数词:例如,she weighs fifty kilograms(她体重五十千克)。

高中英语 高考语法复习 数词(共24张PPT)

高中英语 高考语法复习 数词(共24张PPT)

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4. 分数&小数表示法
50% 0.5
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1 8 1 2
1 4
12.5%
0.125 0.25 25%
18
1/2 1/3 3/4 7/10 9/20
one half = a half one-third three-fourths = three quarters seven-tenths nine-twentieths
➢over three hundred soldiers
➢a few hundred teachers
➢about three hundred monkeys
➢many hundred children
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孔子云:
“二十弱冠, 三十而立, 四十为惑. 五十而知天命, 六十花甲, 七十古来稀, 八十耄耋;…”
在4月5日下午三点
at 3:00p.m. on the fifth of April
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3. 算式表达法
plus
A plus B is C. A and B equals C. If you add A to B, you will get C.
minu s
multiply
A minus B is C . If you subtract B from A , you will get C
➢ 前有数,hundred 无添加
➢ 前无数,hundred “s”跟“of”
➢ 前有数且特指, hundred “of”又加“the”
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高考英语专项语法课件 数词的用法

高考英语专项语法课件 数词的用法

5 作同位语:They four went out for a picnic last Sunday. 上星期天他们4个人出去野餐了。
二、序数词
(二)
序数词
二、序数词
1.序数词的构成
构成
例词
第一、第二、第三需特殊记忆
first 第一;second 第二;third 第三
4~19的序数词是由其相对应的基数 词后面加-th构成
二、序数词
1 2
作主语:The first was no good; the second was even worse.第一个不行,第二个更差。
作宾语:I got the third in this exam in our class.我这次在班里考了第三名。
2. 序数词的 句法功能
3 4
作表语:I will be the first to support you. 我将是第一个支持你的人。
21~99的非整十数由整十数加上1~9基数词 构成,且在十位与个位之间加连字符“-”
twenty-one 21;forty-five 45;seventyeight 78;ninety-nine 99
三位数由“百位数+and+后年的数”构成
a hundred and two 102;five hundred and twenty-six 526
三、其他数词1. 分数Fra bibliotek表示分数时,一般分子用基数词,分母用序数词。分子如果大于1,分母要用复数形式。
(3)带整数的分数用数字表示,在句首时一般用英语单词,整数和分数之间用and连接:
eg:Your package is 2 1 times the weight of mine. 你的包裹是我的包裹的两倍半重。

高三英语语法专题复习之数词课件.pptx

高三英语语法专题复习之数词课件.pptx

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二.序数词
表示排列的顺序,如:first, second, third, fourth…… 序数词前一般要加the。
巧记口诀: 一二三全要变;(first, second, third) 其余都加th; th里有意外,8去t,(eight→eighth)9去e(nine→ninth); 字母f代ve(five→fifth; twelve→twelfth); ty变成tie(twenty→twentieth); 若要变化几十几,只变个位就可以(twenty-one→twenty-first)。
2. scores of/dozens of两者表示的都是虚数“很多”之意。 如: He has been there scores/dozens of times.
Part 3 即学巩固
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1.(2017全国卷Ⅰ)In the summer holiday following my eighteen birthday, I the accident, two ___C__ police were sent to the spot to keep order.
A. dozen of B. dozens C. dozen
D. dozens of
5.The Olympic Games are held ___A___.
driving lessons.
eighteenth
2. When he retired, he was already in his __si_x_ti_e_s__(sixty).
3. Two third of the island’s population made a living by fishing.
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高考英语最新数词知识点图文解析(3)

高考英语最新数词知识点图文解析(3)

高考英语最新数词知识点图文解析(3)一、选择题1.The sentence just doesn’t ___________, no matter how you read it.A.make a sense B.make senseC.make the sense D.make senses2.When armed with ______ awareness of what you truly value, you are in ______ excellent position to pick a career you will find rewarding.A.an; an B.the; anC.an; the D.the; the3.No one hopes the two countries will be at war, because peace is what everyone wants.A.the;the B.a;aC.the;/D./;/4.The firm was badly in need of a manager who has good knowledge of French. A.a;/B.the;aC./;a D./;the5.There was ____ time ______ I stayed in New York with my parents.A.a; that B.a; whenC.the; that D.the; when6.While our manager is away on business, our company will be _____________ Mr. Zhang. A.in the charge of B.in charge ofC.taken charge of D.taking the charge of7.It was ___struggle for him to finish _______experiment, with the room in ________mess after he finished it.A.the; an; / B.a; the; aC.a; an; / D./; the; a8.As a young man, there was _______ time _______ I hated to go to school.A.a; that B.a; whenC.the; that D.the; when9.Last year our team went to Seattle and won ______ second place. Personally, I think the team that was ______ champion cheated.A./, the B.the, theC.a, the D.the, /10.It is believed that traveling to Yangzhou in __ __ March is __ __ enjoyable experience. A./; the B.the; anC.不填; an D.the; the11.______ apple fell from the tree and hit him on ______ head.A.An; the B.The; the C.An; 不填D.The; 不填12.She is ____ honest girl, and she never tells lies.A.a B.anC./ D.the13.Mary, we left you in _______charge of the room, but now it’s in________ mess!A.the; a B.不填;aC.the;不填D.不填;the14.My brother is so interested in languages that, he is now learning _____ third language besides Eng-lish and French.A.不填B.the C.a D.that15.The price of gold has jumped to_______new all-time high as debt worries in the US and Europe continue to trouble the world.A.the;/B.the; theC.a;/D.a;the16.The parents were shocked by______news that their son needed______operation on his knee.A.A; / B.the; / C.the; an D.a; an17.Here in our supermarket fruit is sold by ____ kilogram, that is, by _____ weight.A.the; 不填B.the; the C.不填D.不填; 不填18.Additional ly, China’s total expressway coverage reached 136,400 kilometers by the end of 2017, ranking first in the world, covering 97 percent of cities with _____ population of 200,000 or above.A.the B.a C.her D.its19.Jane’s grandmother has wanted to write ______children’s book for many years, but one thing or another always got in ________ way.A.a, /B.a, the C.the, the D.the, a20.—How do you find the story about ________ blind?—It is so encouraging that I try to read it without ________ second thought.A.a; a B.a; the C.the; a D.the; the 21.—How about _______ Christmas evening party?—I should say it was _______ success.A.a;a B.the;a C.a;不填D.the;不填22.First impressions are the most lasting. After all, you never get ______ second chance to make a first impression.A.a B.the C./D.one23.They made Professor Zhang _____________ director of the institute.A.the B.不填C.a D.an24.My family used to live in _____ city of Shanghai but now have moved to _____ countryside. A.a; a B.the; the C.a; the D.the; 不填25.We went right round to the west coast by sea instead of driving across continent。

高考英语新数词知识点知识点总复习有解析(3)

高考英语新数词知识点知识点总复习有解析(3)

高考英语新数词知识点知识点总复习有解析(3)一、选择题1.This summer’s first heavy rainfall turned Kunming, ________ capital city of Yunnan province into ________ world of water.A.a, a B.a, the C./, a D.the, the 2.When you finish reading the book, you will have __ better understanding of __ life.A.a, the B.the, a C./, the D.a, /3.Living in_________ ever increasingly fast-paced world, we are facing greater competition, so we must take _________ advantage of every opportunity to develop.A.an; the B.an; /C.the; an D.the; /4.When armed with ______ awareness of what you truly value, you are in ______ excellent position to pick a career you will find rewarding.A.an; an B.the; anC.an; the D.the; the5.While he was investigating ways to improve the telescope, Newton made________ discovery which completely changed _________ man’s understanding of color.A.the; a B.a ; theC.a; 不填 D.不填;the6.There was ____ time ______ I stayed in New York with my parents.A.a; that B.a; whenC.the; that D.the; when7.This book tells _________ life story of John Smith, who left _________ school and worked for a newspaper at the age of 18.A.the; the B.a; theC.the; /D.a; /8.- You have been sitting on my hat and now it is badly _________.- Sorry. I will ask my boss for _________ on my salary to buy you a new one. A.out of order; an advance B.out of shape; an advanceC.out of order; the advance D.out of shape; the advance9.He just stood at _________distance, wondering if it was _________ real goodbye.A.a, a B.a, the C.the, the D.the, a10.The government set up _____ organization named Angel to help _____ homeless three years ago.A.the; 不填 B.不填;theC.an; a D.an; the11.While our manager is away on business, our company will be _____________ Mr. Zhang. A.in the charge of B.in charge ofC.taken charge of D.taking the charge of12.According to the latest survey, most students focus more on how to find ________ good job when they leave ________ college.A.a; the B.a; a C.a; 不填D.不填; 不填13.Kevin studied very hard last term and as _____ result, he made _____ great progress. A.a; / B./; aC.a; a D./; /14.My brother is so interested in languages that, he is now learning _____ third language besides Eng-lish and French.A.不填B.the C.a D.that15.Brian is gifted in writing music;he is very likely to be________Beethoven.A.a B.anC.the D.不填16.Only a short-sighted man will lose _______ sight of the importance of education.A.a B.theC./ D.an17.He is in _______ possession of that beautiful garden and the shop is in _______ possession of his brother.A.the; the B.the; /C./; the D./ ; /18.We were sitting quietly. All of sudden, a piece of classical music sounded, which gave life to the whole stadium.A.the; /B.the; the C.a; /D.a; the19.let’s go to ______ cinema , w hich will take your mind off the problem for ______ while. A.the ,the B.the, a C.a, the D.a, a20.Jane’s grandmother has wanted to write ______ children’s book for many years, but one thing or another always got in ________ way.A.a, /B.a, the C.the, the D.the, a21.In ________ film Cast Away. Tom Hanks plays ________ man named Chuck Noland. A.a; the B.the; aC.the; the D.a; a22.The organizer decided to invite Johnny, ______ president of the group, to deliver ______ third speech as his first two were so well received.A.the; the B.a; theC./; a D.the; /23.—How do you find the story about ________ blind?—It is so encouraging that I try to read it without ________ second thought.A.a; a B.a; the C.the; a D.the; the24.As I know, there is ____ car in this neighborhood.A.no a B.no such C.not such D.no such a 25.Besides good diet, Mr. Qu, a marathon runner, takes exercise every day to keep fit. A.a; the B.\; aC.\; \ D.a; \【参考答案】***试卷处理标记,请不要删除一、选择题1.C解析:C【解析】试题分析:句意:今年夏天的首次大雨使云南的省会昆明成了一个水的世界。

第三讲 数词-备战2021年高考英语一轮复习语法知识框架复习

第三讲 数词-备战2021年高考英语一轮复习语法知识框架复习

第三讲数词知识图谱数词的概念和用法知识精讲一、数词概念和用法表示数目多少或顺序多少的词叫数词,数词分为基数词和序数词。

表示数目多少的数词叫基数词;表示顺序的数词叫序数词。

英语的数词可以作句子的主语、宾语、表语和定语。

1. 基数词规则举例特殊1—12的基数词是独立的单词one, two, three, four, five,six, seven, eight, nine, ten,eleven, twelve13—19的基数词以-teen结尾fourteen, seventeen13,15,18较特殊:13—thirteen15—fifteen, 18—eighteen20—90的整十位均以-ty结尾sixty, ninety20, 30, 40, 50, 80较特殊:20—twenty, 30—thirty, 40—forty50—fifty , 80—eighty十位数与个位数之间要加连字符号“—”28—twenty-eight,96—ninety-six百位和十位之间加and 148—one hundred and 若无十位则和个位之间加andforty-eighthundred(百)thousand(千)million(百万)billion(十亿)three hundred,seven thousand,four million, eight billionhundred, thousand, million用复数形式修饰名词时要用“of+复数名词”2. 序数词英语的序数词基本变法:1)一般在基数词后加th。

如:six—sixth2)以-ve结尾的变ve为-f再加th。

如:five—fifth3)以-ty结尾的变ty为-tie再加th。

如:twenty—twentieth4)熟记特殊词。

如:one—first,two—second,three—third注意:(1) 两位以上的序数词仅个位数部分用序数词,其余部分仍用基数词。

高三英语数词(PPT)3-2

高三英语数词(PPT)3-2

A. several scores of
B. several score of
C. several dozens of
D. several dozen of
3. Shortly after the accident, two _____ police were sent to the spot
to keep order.
five thousand students (五千个学生) 但是:在表示不确切数目时,要用复数形式,如:
hundreds of / thousands of 形的激波面(图c )。气流通过圆锥激波的变化与平面斜激波是一样的。所不同的是气流经过圆锥激波的突变之后还要继续 改变指向,速度继续减小,最后才渐近地趋于与物面的斜角一致。也就是说,气流在激波上指向折转不够,所以当半顶角相同时,圆锥所产生的圆锥激波较 之二维翼型的激波; 炒股配资 为弱。 利用气流通过激波时密度突变的特性,可借助光学仪器将激波形状显示出来或拍摄成 像。飞行器在飞行中,激波的产生和它的形状,对飞行器空气动力有很大影响,一些国家对高速飞行的飞行器作了大量的试验和研究,以便采用合适外形, 推迟激波产生或减小波阻。激波可使气体压强和温度突然升高,因此,在气体物理学中常利用激波来产生高温和高压,以研究气体在高温和高压下的性质。 利用固体中的激波,可使固体压强达到几百万大气压(大气压等于帕),用以研究固体在超高压下的状态。这对解决地球物理学、天体物理学和其他科学领 域内的问题有重要意义。 旋转磁场是一种大小不变,而以一定转速在空间旋转的磁场。在对称三相绕组中流过对称三相电流时会产生一种旋转磁场,该磁场 随电流交变而在空间不断地旋转着 [] 。 交流电机气隙中的磁场。因其沿定、转子铁心圆柱面不断旋转而得名。旋转磁场是电能和转动机械能之间互相转换 的基本条件。 通常三相交流电机的定子都有对称的三相绕组(见电枢绕组)。任意一相绕组通以交流电流时产生的是脉振磁场。但若以平衡三相电流通入三 相对称绕组,就会产生一个在空间旋转的磁场。磁场的对称轴线φ随时间而转动,其转速ns由电流频率f和磁极对数P决定 ns称为同步转速或同步速(以转每 分表示)。中国应用的工业电源的频率f为赫,于是两极电机(P=)的ns=转/分;四极电机(P=)的ns=转/分;余类推。 在一般情况下,电流变化一个周期,磁场 轴线在空间就转过一对极。若近似地认为磁场沿圆周作正弦形分布,并用磁场轴线处的空间矢量Ø 来代表,用矢量长度表示磁场振幅,则理论分析证明,三 相对称绕组通以平衡的三相电流时,产生的是一个振幅不变的旋转磁场。这时矢量Ø 在旋转过程中它的末端轨迹为一圆形,故名圆形旋转磁场。这个结论可 以推广到一般的多相(包括两相)系统。即多相电机对称绕组通以平衡多相交流电流,则产生圆形旋转磁场。 一般说来,旋转磁场的转向总是从电流超前的 相移向电流滞后的相。如果将三相的 个引出线任意两个对调再接向电源,即通入三相绕组的电流相序相反,则旋转磁场的转向也跟着相反。 如果三相电

(完整word版)高考英语24个语法之数词.docx

(完整word版)高考英语24个语法之数词.docx

三、数词★ 基数词表示数量的词叫基数词。

1-12 的基数词是独立单词;要注意 thirteen ,fifteen ,eighteen 的拼法稍有不同;13-19 的基数词都是以20-90 的十位数,以后缀-teen 结尾的,-ty 结尾,要注音twenty , thirty , fifty , eighty 的特殊点。

如下表:1基数词的读法⒈三位数的读法:第一个数字+hundred +and+ 后面的一位或两位数字。

如: 107→ one hundred and seven ; 765→seven hundred and sixty-five⒉ 1,000 以上的数的读法:先从后向前数,每三位数加一个逗号,第一个逗号前的数字用thousand (千),第二个逗号前的数字用 million (百万),用“几十 thousand “表示“几万 ",以“几百 thousand" 表示 " 几十万”,用“几十 million" 表示“几千万 " ,用“几百 million" 表示"几亿 " 。

如: 13,789,653 → thirteen million seven hundred and eighty-nine thousand six hundred andfifty-three2数词的复数形式⒈ 表示几十岁时。

如“二十多岁”说twenties ,表示的是 20 岁到 29 岁。

依次类推, thirties表示“三十几岁forties 表示四十几岁” ,但十几岁”不可说tens,而要说teens,指 13 岁至 19 岁。

" ,如: He died in his thirties.She is in her teens.⒉ 表示几十年代。

如:“二十世八十年代”写成1980s 或1980s,均作nineteen eighties,指的是1980至1989年十年,需注意的是,年代用文字表示不可用-s 形式。

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高考英语数词知识点图文解析(3)一、选择题1.It's ______ great surprise when I heard ______ news about the accident.A.the; a B.a; theC.a; 不填 D.the; the2.As we should know, animals are not necessarily ___________ lower form of life than___________ man.A.a; the B.the; theC.a; /D./; /3.When armed with ______ awareness of what you truly value, you are in ______ excellent position to pick a career you will find rewarding.A.an; an B.the; anC.an; the D.the; the4.No one hopes the two countries will be at war, because peace is what everyone wants.A.the;the B.a;aC.the;/D./;/5.There was ____ time ______ I stayed in New York with my parents.A.a; that B.a; whenC.the; that D.the; when6.It is often said that ______teachers have ______very simple life.A.不填;不填 B.the; a C.不填;a D.the; 不填7.He just stood at _________distance, wondering if it was _________ real goodbye.A.a, a B.a, the C.the, the D.the, a8.In________eyes of children,playing on the Internet can only bring them________great fun. A.the;a B.不填;aC.the;不填D.不填;不填9.It was ___struggle for him to finish _______experiment, with the room in ________mess after he finished it.A.the; an; / B.a; the; aC.a; an; / D./; the; a10.As a young man, there was _______ time _______ I hated to go to school.A.a; that B.a; whenC.the; that D.the; when11.Last year our team went to Seattle and won ______ second place. Personally, I think the team that was ______ champion cheated.A./, the B.the, theC.a, the D.the, /12.Many a child in my class has______ great talent for music.A.the B.an C./ D.a13.Kevin studied very hard last term and as _____ result, he made _____ great progress. A.a; / B./; aC.a; a D./; /14.______Jixi today is more beautiful now. Mr. Jackson said he would visit it______third time. A.The;/B.The;the C./;a D.The;a15.We all sighed with ________ relief when ________ plane finally landed safely.A.a; /B./; theC.a; a D.a; the16.Smog has become ________ danger to our life, but we still feel we have ________ power to improve our environment.A./; the B.a; a C.the; the D.a; the 17.—Would you mind giving your advice on how to improve our business management?—If you make ________ most of the equipment, there will be ________ rise in production. A.the; a B./; /C./; a D.the; /18.You’d better try ______ second time if it is ______ first time that you ____.A.the; the; fail B.a; the; have failedC.a; the; should fail D.the; a; fail19.In ________ film Cast Away. Tom Hanks plays ________ man named Chuck Noland. A.a; the B.the; aC.the; the D.a; a20.The paper is due next month, and I am working seven days ______ week, often longinto______night.A.a; the B.the;不填C.a; a D.不填;the 21.Mr. Smith, ________ headmaster of the school, told us, "________ sixth of students here go on to study at Oxford and Cambridge."A./; A B./; The C.the; The D.a; A22.All bad things must come to________end, ________ terrible an experience is.A.the; whatever B.an; however C./; how D.a; what23.The biggest whale is ________ blue whale,which grows to be about 29 meters long—the height of ________ 9-story building.A.the;the B.a;a C.a;the D.the;a24.The white paint was cracked and peeling away from itself in ________ most unpleasant manner unlike the paintwork in the house in Berlin.A.a B.the C./D.any25.—What do you think of the grammar book?—Oh, it is really _____useful reference book, which is worth reading _____second time. A.a, a B.an, theC.an, a D.the, the【参考答案】***试卷处理标记,请不要删除一、选择题1.B解析:B【解析】【详解】考查冠词。

句意:当我听到事故的消息时,真是大吃一惊。

分析句子可知,本句中的第一个空surprise在此指的是”意外的事”,所以第一个空要用不定冠词a,第二个空是特指关于那个事故的消息,是特指,要用定冠词,故选B项。

2.C解析:C【解析】【分析】【详解】考查冠词。

句意:我们应该知道,动物是一种比人类稍低的生命形式。

第一空表达“一种……”,所以要用不定冠词。

第二空Man,专指人类,其前不用冠词。

故选C。

【点睛】man人类;fun乐趣;space太空;nature大自然。

这些词用做此意时其前不用冠词。

3.A解析:A【解析】句意:当你意识到自己真正在乎的是什么,你会处于一种极好的状态去寻找一个你认为值得的职业。

名词awareness和position都是泛指,用不定冠词。

选A。

4.D解析:D【解析】试题分析:考查冠词。

本题第一空是固定词组at war进行战争;在战争中;第二空的peace是抽象名词和平;句意:没有人希望这两个国家卷入战争,因为和平是人们所想要得到的。

故D正确。

考点:考查冠词点评:冠词的考查集中在定冠词the表示特指,不定冠词a/an表示泛指;以及冠词的一些特殊用法和固定词组,还有一些不使用冠词的情况,如抽象名词,物质名词前面就不要冠词。

还要掌握冠词的特殊的用法,如不可数名词变成可数名词;抽象名词具体化等。

5.B解析:B【解析】考查定语从句。

此处time时期,做先行词,在后面的定语从句中做时间状语,故选B。

6.C解析:C【解析】考查冠词。

句意:人们常说老师过着非常简单的生活。

teachers是泛指老师们,不加任何限定词;life表示某种生活时,在前面加上限定词a,指一种简单的生活。

故选C。

7.A解析:A【解析】句意:他站在远处,心里想着这是否是一次真正的再见。

第一空考查固定搭配at a distance在远处;第二空用不定冠词a表示“一次”。

故选A。

8.C解析:C【解析】试题分析:考查冠词。

in the eyes of在……的眼中;所以第一空应该填the;fun是不可数名词,所以第二空不填冠词;可知选C项。

考点:考查冠词9.B解析:B【解析】考查冠词。

句意:完成这个实验对他来说是一次折磨,他完成之后房间里一片混乱。

“struggle”是泛指,用a ;“experiment”是特指,用the;in a mess一片混乱,故选B。

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