cad中pling和ling画出的直线有什么区别
-
快捷键命令【PL】绘制的图形叫【多段线】；
-
快捷键命令【L】绘制的图形叫【直线】；
-
多段线对象可以是直线，也可以是圆弧，可以构成封闭的曲线。
i’d like chicken and cabbage dunpling可数吗
答案：T解析： 可以看出此题是考查可数名词单数变复数时的不规则变化，beef虽然是以f结尾，但却是个特例，单复数同形。chicken cabbage是物质名词，既属于可数名词也属于不可数名词，具体词性根据情况而定，表示泛指的是不可数名词。但当具体化(即转换为个体名词)时，也可以用作可数名词，但词义发生变化。a chicken小鸡photo属于以“辅音字母＋o”结尾的名词，加es，因此是对的。即所并列的三个名词也为beef chicken cabbage potatoes。
”Couple”这个单词是什么意思谢谢！
一般指“夫妻俩”
金山的解释是：
couple
[5kQp(E)l]
n.(一)对, (一)双, 夫妇
vt.连合, 连接, 结合
vi.结合, 结婚
join pair team
couple
AHD:[k绯搮l]
D.J.:[6k(p*l]
K.K.:[6k(p*l]
n.
Two items of the same kind; a pair.
Something that joins or connects two things together; a link.
usage: used with a sing. or pl. verb
Two people united, as by betrothal or marriage.
Two people together.
Informal
A few; several:
a couple of days.
Physics
A pair of forces of equal magnitude acting in parallel but opposite directions, capable of causing rotation but not translation.
couple
v.
cou.pled; cou.pling; cou.ples;
couple
v.tr.
To link together; connect:
coupled her refusal with an explanation.
To join as spouses; marry.
To join in sexual union.
Electricity
To link (two circuits or currents) as by magnetic induction.
couple
v.intr.
To form pairs; join.
To unite sexually; copulate.
To join chemically.
couple
adj. Informal
Two or few:
揈very couple years the urge strikes, to . . . haul off to a new site?Garrison Keillor)
Middle English
fromOld French
fromLatin c絧ula[ bond, pair ]
couple pair brace yokeThese nouns denote two individuals of the same kind together. 《SKW》 Coupledoes not necessarily imply more than association:
a square dance performed by four couples. The term may also mean simply 揻ew?
a couple of minutes;
a couple of books. 《SKW》Pair stresses close association and often reciprocal dependence of things (
a pair of gloves;
a pair of pajamas); sometimes it denotes a single thing with interdependent parts (
a pair of scissors;
a pair of spectacles). 《SKW》 Brace refers principally to certain animals or game birds (
a brace of hounds;
a brace of partridges), and yoke to two joined draft animals (
a yoke of oxen).
When used to refer to two people who function socially as a unit, as in a married couple, the word couple may take either a singular or a plural verb, depending on whether the members are considered individually or collectively:
The couple were married last week.
Only one couple was unaccounted for. When a pronoun follows, they and their are more common than it and its:
The couple decided to spend their (less commonly its) vacation in Italy. Care should be taken that the verb and the pronoun agree in number:
The couple have their (less commonly has its) primary residence in New York. ?Although the phrase a couple of has been well established in English since before the Renaissance, it has been criticized on several grounds. Grammarians used to insist that a couple of should be used only to refer to things closely linked to one another and so was improperly used in phrases such as a couple of years ago. This objection has not been heard in some time and was never well supported. Modern critics have sometimes maintained that a couple of is too inexact to be appropriate in formal writing. But the inexactitude of a couple of may serve a useful communicative purpose, suggesting that the writer is indifferent to the precise number of items involved. Thus the sentence She lives only a couple of miles away implies not only that the distance is short but that its exact measure is unimportant. Furthermore, a couple of is different from a few in that it does not imply that the relevant amount is relatively small. One might say admiringly of an exceptional center fielder that he can throw the ball a couple of hundred feet, but not, except ironically, a few hundred feet, which would suggest that such a throw was unremarkable. The usage should be considered unobjectionable on all levels of style.
couple
AHD:[k绯搮l]
D.J.:[6k(p*l]
K.K.:[6k(p*l]
n.
Two items of the same kind; a pair.
一对，一双同一种类的两件；一对
Something that joins or connects two things together; a link.
连接物把两件东西连接在一起的东西；连接物
usage: used with a sing. or pl. verb
usage: 与单数或复数动词连用
Two people united, as by betrothal or marriage.
夫妻，情侣通过订婚或婚姻结合在一起的两个人
Two people together.
一对在一起的两个人
Informal
【非正式用语】
A few; several:
数个；几个：
a couple of days.
几天
Physics
【物理学】
A pair of forces of equal magnitude acting in parallel but opposite directions, capable of causing rotation but not translation.
力偶具有相等磁性的两个力，平衡作用但反向，能导致旋转但不能造成平移
couple
v.
cou.pled; cou.pling; cou.ples;
couple
v.tr.
To link together; connect:
连在一起；连接：
coupled her refusal with an explanation.
她的带有解释的拒绝
To join as spouses; marry.
成双，结婚作为配偶结合；结婚
To join in sexual union.
性交，交配
Electricity
【电学】
To link (two circuits or currents) as by magnetic induction.
连接如通过电磁感应连接（两条线路或电流）
couple
v.intr.
To form pairs; join.
形成对；连接
To unite sexually; copulate.
性交；交配
To join chemically.
化学上结合
couple
adj. Informal
Two or few:
两个的，几个的：
揈very couple years the urge strikes, to . . . haul off to a new site?Garrison Keillor)
“每几年，想撤离去一个新地点的冲动就来了”(加里森·谢勒)
Middle English
中古英语
fromOld French
源自古法语
fromLatin c絧ula[ bond, pair ]
源自拉丁语 c絧ula[ 绳索，对 ]
couple pair brace yokeThese nouns denote two individuals of the same kind together. Coupledoes not necessarily imply more than association:
a square dance performed by four couples. The term may also mean simply 揻ew?
由四对表演的四方舞。这个名词也可以指简单的“几个”：
a couple of minutes;
几分钟；
a couple of books. Pair stresses close association and often reciprocal dependence of things (
几本书。《SKW》Pair强调亲密的联系和事物相互依赖：（
a pair of gloves;
一副手套；
a pair of pajamas); sometimes it denotes a single thing with interdependent parts (
一套睡衣裤）；有时它表示具有两个相互依赖部分的一件东西（
a pair of scissors;
一把剪刀；
a pair of spectacles). Brace refers principally to certain animals or game birds (
一副眼镜）。《SKW》 Brace主要指某种动物或驯鸟（
a brace of hounds;
一对猎狗；
a brace of partridges), and yoke to two joined draft animals (
一双鹧鸪）， yoke主要指两个连在一起的役用动物（
a yoke of oxen).
一对牛）
When used to refer to two people who function socially as a unit, as in a married couple, the word couple may take either a singular or a plural verb, depending on whether the members are considered individually or collectively:
当用来表示作为一个单位来行使社会功能的两个人时，如在 一对已婚夫妇中，单词 couple既可以带单数动词也可以带复数动词，这取决于两个人是被单个或集体地看待的：
The couple were married last week.
这一对夫妇是上星期结的婚。
Only one couple was unaccounted for. When a pronoun follows, they and their are more common than it and its:
只有一对夫妇没被算在内。如果后面跟有代词， they和 their比 it和 its要常用一些：
The couple decided to spend their (less commonly its) vacation in Italy. Care should be taken that the verb and the pronoun agree in number:
这对夫妇决定在意大利度过他们的（很少用 its） 假期。应当注意动词和代词在数上要一致：
The couple have their (less commonly has its) primary residence in New York. ?Although the phrase a couple of has been well established in English since before the Renaissance, it has been criticized on several grounds. Grammarians used to insist that a couple of should be used only to refer to things closely linked to one another and so was improperly used in phrases such as a couple of years ago. This objection has not been heard in some time and was never well supported. Modern critics have sometimes maintained that a couple of is too inexact to be appropriate in formal writing. But the inexactitude of a couple of may serve a useful communicative purpose, suggesting that the writer is indifferent to the precise number of items involved. Thus the sentence She lives only a couple of miles away implies not only that the distance is short but that its exact measure is unimportant. Furthermore, a couple of is different from a few in that it does not imply that the relevant amount is relatively small. One might say admiringly of an exceptional center fielder that he can throw the ball a couple of hundred feet, but not, except ironically, a few hundred feet, which would suggest that such a throw was unremarkable. The usage should be considered unobjectionable on all levels of style.
这对夫妇（很少用 has its ） 最初的住处在纽约。 尽管 a couple of 这个短语在文艺复兴之前就已在英语中形成，它仍受到多方面批评。语法学家过去坚持认为 a couple of 应该只用于指互相之间紧密相连的东西，所以在 a couple of years ago这样的短语中用是不适当的。这样的反对意见长时间没有人提起了，也从未受到太多支持。现代批评家有时也认为 a couple of 太不精确，不能很恰当地用于正式的写作中。但 a couple of的不精确性也有一种很有用的传达交流的意图，表明作者对于所涉及的事物的精确数目并不太关心。因此 她住的只有几英里远这个句子不仅表明距离很远，同时也表明精确测量是不重要的。另外 a couple of与 a few 的不同还表现在它不表示有关的数量是相对来说小的。如果夸赞一个优秀的中外野球手，可以说 他能把球抛几百英尺远，若非如此的话，排除反意的可能， a few hundred feet指抛这么远并没什么稀奇之处。这种用法在各种文体上都是无可辩驳的
couple
[5kQp(E)l]
n
（一）对；（一）双
a couple of socks
一双袜子
夫妻
My brother and his wife are a happy couple.
我弟弟和他的妻子是一对幸福的夫妻。
几个；三两个
I have a couple of things to do.
我有几件事情要办。
I waited a couple of hours.
我等了几个小时。
couple
vt
-pled, -pling
连接；结合
（动物的）交配，配对，交媾，交合
join pair team
couple
[5kQpl]
n.
夫妻， 配偶
两个(人或物)； 一对
〔口〕交配
〔口〕（少数）几个， 两三个
【物】力偶； 力矩； 电偶， 热偶
【天】联星
联接器
两只猎犬
a newly married couple
新婚夫妇
arrange the chairs in couple
一对对地排放椅子
Ten couples took the floor.
场上有十对舞伴。
I have a couple of things to do.
我有几件事要做。
couple
vi.
成对
拥抱， 交媾
vt.
连在一起， 配合， 连接； 组合， 耦合
加倍
由…联想到； 把…同联系起来
Her name was coupled with his.
她的名字与他的连在一起。
a couple of
两三个， (少数)几个
be coupled with
和…联合， 结合
go [hunt, run] in couples
总是成双成对； 协力
coupled with
加上， 外加
in a couple of shakes
刹那间， 马上
It is not every couple that is a pair (=Every couple is not a pair.)
成双未必能配对。
couple in
耦合， 接入
couple …to
把…结合到
couple up
把…耦联起来
antimony bismuth couple
锑铋热电偶
astatic couple
无定向的磁〔针〕偶
base metal couple
基金属热电偶
bigraded exact couple
双重分次正合偶
centrifugal couple
离心力偶
chromel-alumel couple
铬-铝热电偶
concentrated couple
集中力偶
controlling couple
控制力偶
copper-constantan couple
铜-康铜热电偶
deflecting couple
转矩， 偏转力偶
exact couple
正合偶
flame couple
热电偶
galvanic couple
电耦合
geosynclinal couple
【地质】偶地槽
gyroscopic couple
陀螺力矩
heater bridge wall couple
加热炉隔墙测温热电偶
heater flue couple
加热炉废气（或出气口）的热电偶
heater outlet couple
炉出口处热电偶
inertia couple
惯性力偶
instantaneous couple
瞬时力偶
junction couple
结式热偶
magnesium couple
镁电偶
magnetic couple
磁偶
main couple
【建】主桁架
nichrome alumino-copper couple
镍铬-铝铜热电偶
nichrome alumino-nickel couple
镍铬-镍铝热电偶
nursing couple
哺乳的母子（心理分析用语）
ordered couple
有序数偶
prime couple
素数偶
reducing couple
还原偶
restoring couple
回复力偶
resultant couple
合成力偶
righting couple
正位力矩
rocking couple
摆动力偶
roll couple
(轧机机架的)倾翻力偶
semi-exact couple
半正合偶
standard couple
标准热电偶
stress couple
应力偶
thermal couple
热偶
thermoelectric couple
热电偶
torsion couple
扭转耦合
turning couple
扭转力偶
twisting couple
扭力偶
unit couple
单位力偶
volta couple
伏打电偶
zinc couple
锌半电池， 锌电偶
zinc copper couple
套淀积铜的锌片； 锌铜偶
couple of forces
力偶
英汉电力大词典
couple
n.力偶,偶,连接
新英汉法学大词典
couple
n.夫妇 ,夫妻,配偶
英汉环境大词典
couple
n.偶,偶联,力电偶
新英汉石油技术词典
couple
耦，力偶，电偶，力矩；〔一〕双，〔一〕对
英汉能源大词典
couple
n.偶,对,力偶
英汉石油大词典
couple
n.偶
英汉冶金大词典
couple
n.偶,对
英汉医学大词典
couple
n.力偶,联结
英汉中医大词典
couple
n.配合,配偶
person和people的区别
people和person的区别
people【复数】 people
Human beings considered as a group or in indefinite numbers:
人类：被看做整体或不定数量的人类：
People were dancing in the street. I met all sorts of people.
人们在街上跳舞。我遇到了各种各样的人
A body of persons living in the same country under one national government; a nationality.
同胞：住在同一国家、受同一政府管辖的一些人；民族
pl. peo.ples A body of persons sharing a common religion, culture, language, or inherited condition of life.
【复数】 peo.ples 民族：有共同的宗教信仰、文化、语言或继承同一种生活条件的人的群体
Persons with regard to their residence, class, profession, or group:
同类人：由于同样的居住地、阶级、职业或群体而联系在一起的人：
city people.
城市人
The mass of ordinary persons; the populace. Used withthe :
大众：平凡人的群体；大众。与the 连用：
“those who fear and distrust the people, and wish to draw all powers from them into the hands of the higher classes”(Thomas Jefferson)
“那些害怕且不信任群众的人，想把所有的权力都集中到上层阶级手上”(托马斯·杰弗逊)
The citizens of a political unit, such as a nation or a state; the electorate. Used withthe.
公民：某政治团体例如一个民族或一个国家的成员；选民。与the 连用
Persons subordinate to or loyal to a ruler, a superior, or an employer:
臣民：受辖制或忠诚于其某一统治者、上司或雇主的人：
The queen showed great compassion for her people.
女王对她的臣民很仁慈
Family, relatives, or ancestors.
家人，亲戚，祖先
Informal Animals or other beings distinct from human beings:
【非正式用语】 动物：明显区别于人类的动物或其他生灵：
Rabbits and squirrels are the furry, little people of the woods.
兔子和松鼠是森林中毛茸茸的小生灵
v.tr.（及物动词）
peo.pled,peo.pling,peo.ples
To furnish with or as if with people; populate.
繁衍：分布或似乎分布着人；居住
person A living human being. Often used in combination:
人：一活着的个人。常用于合成词中：
chairperson; spokesperson; salesperson.
主席；发言人；销售员
An individual of specified character:
个人：有特定性格的人：
a person of importance.See Usage Note at man
重要人物参见 man
The composite of characteristics that make up an individual personality; the self.
本性：组成个人的性格特征总和；本性
The living body of a human being:
身体，躯体：人的活着的身体：
searched the prisoner’s person.
搜身
Physique and general appearance.
形体，外貌：体格或总体上的外表
Law A human being or an organization with legal rights and duties.
【法律】 自然人；法人：具有法律权利和义务的自然人和组织
Theology The separate individualities of the Father, Son, and Holy Spirit, as distinguished from the essence of the Godhead that unites them.
【神学】 三位一体的位：圣父、圣子和圣灵的独立的位，以区别于统一他们的上帝的实体
Grammar
【语法】
Any of three groups of pronoun forms with corresponding verb inflections that distinguish the speaker (first person), the individual addressed (second person), and the individual or thing spoken of (third person).
人称：指关系到谓语动词变化的三类人称形式，用以区别说话人（第一人称）、武汉小马过河国际教育，雅思培训，托福培训，SAT培训。与之交谈的人（第二人称）和提及的人或东西（第三人称）
Any of the different forms or inflections expressing these distinctions.
表示某人称的词形：表示这些区别的不同的形式或变化
A character or role, as in a play; a guise:
角色，身份：戏剧中的角色；装扮：
“Well, in her person, I say I will not have you”(Shakespeare)
“好啦，对于她的角色，我说我不会让你来演”(莎士比亚)
抽样统计是什么
ehouyong
tongji
抽样统计(~pling
statisties)按照随机原则从资
源开发利用现象的总体中抽取一部分个体进行统计调查，用
调查的个体样本推断总体的某些指标的一种非全面调查。抽
样统计设计有简单随机抽样、分层抽样、系统抽样、分群抽
样、多级抽样等方法。
在抽样统计中有时不能以自然个体为单位，而要按实际
需要和使用方便把这些自然个体划分为若干单元，抽样时把
每个单元看作一个个体，称为抽样单元。比如可在地图上划
分许多格，每格代表一个抽样单元，格的大小也可不同。构
成总体的全体抽样单元的一个总的描述叫做抽样框，一幅地
图也可为抽样框。
出于对费用和时间的考虑，抽样统计已逐渐作为一个重
要的统计方法。这是因为，普查的工作量太大，往往为人力、
财力、时间所限，在实施过程中易出现人为的误差;经验表
明，有时一个精心设计的抽样方案，其实施效果甚至可以胜
过普查。