招募物理老师一名请问,屋顶上有一个定滑轮,定滑轮上的绳子一端拴着一个100公斤的重物,另一端是一个70公斤的人,之后,人

Dear Propriter:
This is Lihua.It's my honour to send this letter to you.I am very interesting in your English drama club when I saw your picture poster.And I would like to jion the big family if you appove.I have many hobbies,such as English song,film,playing football.By the way,I am the the organization memeber in my class and I think they are my strength.My classmate like me very much and they are all enjoy our class activies.I hope I can in charge of the organization task in your club.And I will be a good member in this club.I would like to show myself and practise my self
And I also can make many friend by this way.
Hope you can give me the chance.Thank you very much.Waiting for your good news.
From：Lihua
亲爱的社长：
我是李华,很荣幸给您寄这封信.我看了社团的宣传画后对英文戏剧社团非常该兴趣.如果您允许的话希望能加入这个大家庭.我有很多爱好,例如：英文歌曲,电影和足球.顺便说一句,我在班里担任组织文员,我认为这些都是我的长处.我的同学都很喜欢和享受班里的活动.我希望我在社团里能担任组织工作.我会成为社团里非常有用的一名成员.我希望能展示自己并且锻炼自己.我还能以这种方式交道很多朋友.
希望您能给我这个机会,期待您的回信!
来自：李华

Bilingual Secretary Wanted Our company requires a bilingual secretary for our office.She must be bilingual in English and Japanese. Competitive salary

Hey, I`m Tom Green, I`ve hearted the news about recruiting member of School`s gym club. I am good at playing tennis and basketball, hoping one day could become a professional athlete. I am desire for joining a gym club, hence strengthening my body function and gaining a good health. If I am in, I will exercise even harder to achieve my goal, and gain good grades in every competitive matches.

Dear Mr.Blake
I'm a student named li hua,I'm glad to see that your organization in recruiting volunteers.Since I have always had a cultural sites to have an interest in thick.Ordinary,on the attention is more also.Therefore,I write this application to you ,hopping you can accept me.If I was approved,I will try my best to organize the service.
I look forward to your early reply,sincerely hope you can give me such a chance.Thank you!

由题意知本题是一个分类计数问题，
要“确保5号与14号入选并被分配到同一组”，
则另外两人的编号或都小于5或都大于14，
于是根据分类计数原理，得选取种数是C ₄ ² +C ₆ ² =6+15=21，
故选B

Many students go to school by yellow bus or on foot.And a few of them ride to school.They usually have lunch in school and they don't eat out of school during school time.They don't have a rest after lunch.And they finish their class in about 3 o'clock.They play basketball,play football and swimming in their free time.And they hold the ball game four times a year.How wonderful the school life is!
望采纳

（1） （2）数学期望: ,分布列见解析

本题主要考查茎叶图、分层抽样、随机事件的概率、对立事件的概率、随机变量的分布列以及数学期望等基础知识，考查运用概率统计知识解决简单实际问题的数据处理能力和应用意识
（1）由题意及茎叶图，有“高个子”12人，“非高个子”18人，利用用分层抽样的方法，每个人被抽中的概率是 ，利用对立事件即可；
（2）由于从所有“高个子”中选3名志愿者，用ξ表示所选志愿者中能担任“礼仪小姐”的人数，利用离散型随机变量的定义及题意可知ξ的取值为0，1，2，3在利用古典概型的概率公式求出每一个值对应事件的概率，有期望的公式求出即可．
（1）根据茎叶图，有“高个子”12人，“非高个子”18人，
用分层抽样的方法，每个人被抽中的概率是 ，
所以选中的“高个子”有 人，“非高个子”有 人．
用事件 表示“至少有一名“高个子”被选中”，则它的对立事件 表示“没有一名“高个子”被选中”，
　则 ．因此，至少有一人是“高个子”的概率是 ．
（２）依题意，2 的取值为 ．　　　　　　　　　
　 ，　　　 ，
　 ， ．
　因此，2 的分布列如下：

2


0
1

My name is Tom Green. I want to join the Sports Club. I like doing sports very much. I am good at playing football, badminton and basketball. I am sure I can be an active participant in the club.

Panda Guardian Angels WantedChengdu Panda Research Centre is looking for six Guardian Angels whose jobs are to open a blog renew it every two days and let and net citizens know how they are getting on...

（1）根据茎叶图，有“高个子”12人，“非高个子”18人，
用分层抽样的方法，每个人被抽中的概率是
所以选中的“高个子”有 人，“非高个子”有 人
用事件A表示“至少有一名“高个子”被选中”，则它的对立事件 表示“没有一名 “高个子”被选中
则 1-
因此，至少有一人是“高个子”的概率是 ；
（2）依题意，ξ的取值为




因此， 的分布列如下：

∴ 。

解题思路：英语主要分布地区有：英国、美国、加拿大、印度、澳大利亚、新西兰等，适用范围最广．

汉语是世界上使用人数最多的语言，英语是世界上使用范围最广的语言．
故选：B．

点评：
本题考点： 世界主要语言及其分布地区．

考点点评： 本题考查了世界主要语言及其分布，此题难度不大，易于掌握．

解题思路：根据题意，既精通英语，又精通日语的“多面手”是特殊元素，所以可以从他们的参与情况入手进行分类讨论．

按“多面手”的参与情况分成三类．
第一类：多面手不参加，这时有C₅⁴C₄⁴种；
第二类：多面手中有一人入选，
这时又有该人参加英文或日文翻译两种可能，
因此有C₂¹C₅³C₄⁴+C₅⁴C₂¹C₄³种；
第三类：多面手中两个均入选，
这时又分三种情况：两个都译英文、两个都译日文、两人各译一个语种，
因此有C₂²C₅²C₄⁴+C₅⁴C₂²C₄²+C₂¹C₅³C₁¹C₄³种．
综上分析，共可开出C₅⁴C₄⁴+C₂¹C₅³C₄⁴+C₅⁴C₂¹C₄³+C₂²C₅²C₄⁴+C₅⁴C₂²C₄²+C₂¹C₅³C₁¹C₄³=185种．
故选B．

点评：
本题考点： 计数原理的应用．

考点点评： 本题考查排列、组合的运用，注意分类方法，体会分类方法在解组合问题中的作用．

the club is recruiting new members~

Notice
Dear all,
There will be some exchange students from UK coming to our school next month.
We are looking for some families to volunteer to get them settled.
This will be a good chance for all of you to learn English more easily.
The volunteers who want to accept the exchange students please contact Li Hua at School International department.
Many Thanks.
Ｌｉ　Ｈｕａ

A Letter of ApplicationDear Sir or Madam,Learning the news from the official channel of the Organizing Committee of 29th Olympic Games that Beijing Olympia has commenced/started to recruit volunteers, I am writing this letter to / I would like to forward a formal application to become one volunteer. Being a extroverted (外向的)/confident and optimistic boy, I am now a sophomore in Beijing University majoring in English. A good mastery of the first Olympic official language and two years work experience as the minister of the publicity / propaganda department (宣传部)in the student union have qualify me to be a good helper to others and a even better one when I graduate in 2008. Furthermore I have been keen on sports and worshiped（崇尚） the Olympic slogan (口号)which advocate to be higher, faster and stronger which will also enable me to get devoted to the voluntary work. All in all, I am very confident to be a competent volunteer, a job both challenging and rewarding. I would be highly appreciated in case that you can consider my application favorably and forward me with the details for the application at your earliest convenience. Awaiting your reply. / Looking forward to your reply.Enclosure: Curricular Vitae.

解题思路：（1）根据茎叶图，可得“高个子”12人，“非高个子”18人，每个人被抽中的概率是[1/6]，可得人数；
（2）搞清事件的对立关系：用事件A表示至少有一名“高个子”被选中，则它的对立事件

.

A

表示没有一名“高个子”被选中，通过求事件

.

A

的概率来求解．

（1）根据茎叶图，有“高个子”12人，“非高个子”18人，
用分层抽样的方法，每个人被抽中的概率是[5/30 ＝
1
6]，
所以选中的“高个子”有12×[1/6＝2人，“非高个子”18×
1
6＝3人
（2）用事件A表示至少有一名“高个子”被选中，
则它的对立事件
.
A]表示没有一名“高个子”被选中，
则P（A）=1-

C23

C25=1-[3/10]=[7/10]
因此至少有一人是高个子的概率是[7/10]

点评：
本题考点： 分层抽样方法；茎叶图；古典概型及其概率计算公式．

考点点评： 本题为概率统计的综合，涉及茎叶图，分层抽样，和古典概型的求解，用对立事件的方式来求解往往会使问题简单，属基础题．

DearMr.Black,
I'm writing to tell you that I am very interested in getting a position in yourvolunteer team.I will feel very pleased and happy if I and do something forthe people of the local community.In this world everyone needs helps ofothers.Only when our society is full of love and kindness can it be a peacefuland harmonious one.I would like to do some volunteered work to make my littlecontribution to the construction of a healthy society.
Ihope my application will be successful and I look forward to your letter.
With kind regards!
ztlth

解题思路：（Ⅰ）通过频率分布直方图可求出第2，3组人数频率，从而确定其人数，然后即可求出表2中的a、x的值；（Ⅱ）根据分层抽样的性质直接计算即可；（Ⅲ）列举抽取2人所有基本事件，找出的基本事件，利用古典概型计算即可．

（Ⅰ）由频率直方图可知，第2，3组总人数分别为：20人，30人．
∴a=0.9×20=18（人）．x=[27/30]=0.9．
（Ⅱ）在第2，3，4组回答完全正确的人共有54人，用分层抽样的方法抽取6人，
则各组分别抽取：
第2组：[18/54×6=2人；
第3组：
27
54×6=3人；
第4组：
9
54×6=1人．
∴应在第2，3，4组分别抽取2人，3人，1人．
（Ⅲ）分别记第2组的2人为A₁，A₂，第3组的3人为B₁，B₂，B₃，第4组的1人为C．
则从6人中随机抽取2人的所有可能的结果为：
（A₁，A₂），（A₁，B₁），（A₁，B₂），（A₁，B₃），（A₁，C），
（A₂，B₁），（A₂，B₂），（A₂，B₃），（A₂，C），
（B₁，B₂），（B₁，B₃），（B₁，C），
（B₂，B₃），（B₂，C），（B₃，C）
共15种情况．
获奖2人均来自第3组的有：（B₁，B₂），（B₁，B₃）（B₂，B₃）共3种情况．
故获奖2人均来自第3组的概率为
3
15]=[1/5]．

点评：
本题考点： 古典概型及其概率计算公式；频率分布直方图．

考点点评： 本题考查频率直方图，分层抽样，古典概型概率计算等知识的综合应用，属于中档题．

Dear Sir,
My name is Li Hua.I would like to work as a volunteer for the Windter Asia Games.
I am so excited to know that the Games will be held at the place that I am living.I think it is a once in a life time opportunities for me.
I am 18,male,a final year student of xxx High School.My interest in study is English.I am the secretary of the English Club in our school.I also enjoy sport activities.I take part in our school athletic meet every year.I am a very friendly,helpful and polite person and I am very familiar with the local conditions.
I promise to offer my best service if I am selected.I have attached with this letter,a recommendation from my teacher,for your considerations.I am also prepared to sit for an interview at a time to your convenience.
Hope to hear a favorable reply from you soon.
Thank you.
Yours sincerely,
Li Hua

Travel Partner Wanted
I am a 18 years old girl. I plan to visit Britian this summer holiday. I have booked my flight departing from Beijing on 14th July. I will stay in London for 3 days and then travel towards Scotland by train. I would like to have somebody to join in and the bills. You need to be around 18 and easy to get on with. Both male and female are welcome. If you are interested. Please contact me by email.

（1） ；（2）1.

(1)先根据茎叶图得到“高个子”12人，“非高个子”18人，再由分层抽样得选中的“高个子”有 人，“非高个子”有 人。利用古典概型和对立事件的概率公式求出至少有一人是“高个子”的概率；（2）由（1）得 的取值为 ，分别求出其对应的概率，列出X的分布列，由期望公式计算 的数学期望。
（1）根据茎叶图，有“高个子”12人，“非高个子”18人，……1分
用分层抽样的方法，每个人被抽中的概率是 ， ……2分
所以选中的“高个子”有 人，“非高个子”有 人．3分
用事件 表示“至少有一名“高个子”被选中”，则它的对立事件 表示
“没有一名“高个子”被选中”，则 ．…5分
因此，至少有一人是“高个子”的概率是 ． 6分
（２）依题意， 的取值为 ． 7分　 ，　　　 ， ． …9分
　因此， 的分布列如下：

My English is not good,but I'm very interested in it.Because the future is useful to learn English.In this English club I can develop the habit of learning English and meet more friends.I am very interested in English talent shows.It is very vivid,and I will not shy.Watch English movies is also very good,I can understand the way foreigners speak English and their culture.Apart from the above,I would like to form a study group in English.We can communicate with each other in their spare time.
Hope this help you.

One Possible Version:
We have planned several activities. When we get there, we will visit the elderly in their rooms in groups, presenting them with flowers and self – made cards to show our respect and love. Then we will do some cleaning and washing for them with the help of the nurses.
As some old people feel lonely, we may chat with them about their old days, changes of our city, or anything they are interested in. We may also give them some performances: singing, dancing, and so on.
I am sure we will both gain a better understanding of the elderly in China. If you have any suggestions, please let us know.

物理以兴趣为主,社团活动可以安排一些兴趣实验或实践实验 ,实践实验要求比较高.个人建议以兴趣活动为主,比如火箭制作啊 之类的

Dear Chairman,
I am li hua,a student from class fiwe,Grade three.l know that you want new members for your volunteer group and l want to be one of them.I want to help the old because I think they are so old that they can not do some physical job ,such as cleaning the room,washing clothes and so on.Besides I can sing or dance for them in order to make them happy .I think it a duty for us to help the old .And it is also a pleasure for us.

Dear Headmaster,
I am more than excited to hear that the Asian winter Games will be held in our city. And I strongly hope to be accepted as a volunteer for the games.
I am a student of Senior Three. I am fond of sports, and most of my spare time is spent on the playground with my friends. Of all my subjects at school, English is y favourite one , so I’m sure I can be of some help to foreign players during the games. And I can communicate with them after the game, for example , introducing our city to them. I’m outgoing and I am always ready to help others.
Hope the games to be a great success.
Hope I will be chosen to be one of the volunteers.
Yours
Li Hua

Hi,boys and girls ,come and join our City Art Festival .Our monitor hopes that all of us can take an active part in the activity.I 'm looking forward to be a volunteer this festival .Because I can exercise myself ,show myself to others .It is a good chance to learn from each other.If you can paint ,sing ,dance ,play the instrument ,then you can be in our City Art Festival .Don't be shy .Come on .

Application to Volunteer Association
Dear who is concerned
My name is Li Hua.I know you are recruiting some new blood for your association.I am willing to join you and become a member of your team to serve the Children's Hospital in summer vacation.It will be a meaningful voluntary activity.
There are several reasons make me qualified for your association.I am a warmhearted person with great passion.Also I have many experience working as a volunteer before.Most of all,I attach great importance to the sense of responsibility and team spirit.
I would appreciate it and be honored if you offer me that chance.
Yours faithfully
Li Hua
志愿者申请
致相关人员
我名叫李华.得知你们正在为你们的协会招募新鲜血液,我十分乐意加入并且成为你们的一份子,在暑假里为儿童医院做志愿服务.我相信那将会是十分有意义的活动.
有以下一些理由是我胜任你们的协会.我是一个充满激情而热心的人.我也有许多和支援者相关的经验.最重要的是,团队协作和责任感是我最看重的.
如果你们给我这个机会我将不甚荣幸和感激.

Dear everyone,
There is an execellent chance for all the students in Senior 1 to know more about our Chinese history.Professor Wang ping will give us a lecture in Room405 ,Building 2.During the whole lecture ,you will wander around the wonderful river of history and extremely fall in love with it.
As for the time,the lecture will be hold from 2:30 to 4:30 on Wednesday,October 3rd.Everyone else who is keen on history
is welcomed!
Best wishes!
The Students'Union

Dear Propriter:
This is Lihua.It's my honour to send this letter to you.I am very interesting in your English drama club when I saw your picture poster.And I would like to jion the big family...

Dear 2012 Olympic Committee,
I am writing to apply for a position at your Volunteer Post. I would be interested in the work as a interpreter. I’m LiuMing. I’m 17 this year. I’m a student in Harbin No.6 High School Senior Three. I’m very cheerful and lively, and I like to make friends with people. I want to get the work of interpreter, because I like to speak English and read English novels. My favourite sports are skating and swimming, so I often go to skating or swimming with friends at weekend. It helps me have a keen mind to report something on a fast speed and have a strong body to work day and night. I had got the first prize in the English speech contest of our school when I was fourteen. I also had got the second prize in the English speech competition of our city when I was fifteen. If I get the work, I will work hard, make some contribution to 2012 London Olympic Games. I am looking forward to your early reply.
Yours,
　　　　　　　　　　　　　　　　　　　LiuMing

本文是一封对伦敦奥运会志愿者的申请书，不仅写清楚自己的个人信息，性格特点，兴趣爱好，还要写清楚的相关经历。并且说明自己申请的是什么职位的志愿者。为什申请这个职位的志愿者？最后还要表示如果得到此位置，我该如何工作。

Dear Sir or Madam,
I'm Li Hua, a middle school student from China. I read the announcement of the summer
camp that you have posted on the Internet and I am interested in it. I know that you welcome
students from different countries and I'd like to take part in it. I've been learning English for
10 years, and I speak fluent English. What is more, I'JI be able to tell students from other
countries about China and learn about their countries as well. I hope I will be accepted as a
member of your summer camp.
Looking forward to your reply!
Regards,
Li Hua
望采纳,谢谢!

由茎叶图知：所有高个子男女共12人，其中男8人，女4人，又由题意从所有“高个子”中选3名志愿者，故所有高个子中任取3人的所有可能为C₁₂³，
又由于只有“女高个子”才担任“礼仪小姐”，这样只有4名女高个才能从当礼仪小姐，又由于总共选3人，所以ξ=0，1，2，3
P（ξ=0）═

C38

C312＝
14
55，P（ξ=1）=

C14
C28

C312＝
28
55，P（ξ=2）=

C24
C18

C312＝
12
55，P（ξ=3）=

C34

C312＝
1
55，
利用期望定义可知：Eξ=0×
14
55+1×
28
55+2×
12
55+3×
1
55＝1．
故答案为：1

I come from Australia and have been studying in Beijng for nearly 2 years.I really want to be a volunteer for Beijing Olympic Games in 2008.I have the confidence to be an outstanding volunteer for the different posts,for I acquaint myself with the culture and history of Beijing,master the basic knowlege for Olympic Games professionally and have provided the volunteery service on the Sydeny Olympic Games.
On the basis of my practice on the Sydeny Olympic Games,I believe I can be a good volunteer in 2008!
I want to be a volunteer of beijing olympic games.I realized the time flies.I must study english very hard.Because English is very useful and it is very important.And to be a volunteer of the olympic games is good for myself too.I can make some friends from different countries and learn more about sport,about olympic.But the first thing to perpare this is study hard,I am confident i will to be a good volunteer and I will show the world:our country and our cities are so perfect in the world.
可适当改改

Dear 2012 Olympic Committee,
Thank you for taking your time to read my letter. I am writing to apply for a position at your Volunteer Post.
I am Li Hua, 18 years old, a senior student in Grade 3. I promise I will try to serve with enthusiasm our guests from all over the world. Besides, I have rich knowledge about Chinese history, so I will be not only a servant but also a carrier for our splendid culture. What’s more, I am good at English and can speak it fluently in English I think it easy for me to communicate well with the foreigners. Above all, I have experienced the 2010 Guangzhou Asian Games and I have been a successful stadium volunteer.
To sum up, I believe I can be a qualified volunteer. I will value the chance and do all I can if I could be accepted.
I am looking forward to your early reply.
Yours,
Li Hua

let's sing and dance together !
are you a musician ?do you enjoy playing the piano or the drum?if you do ,talk to us!
we hope you can join us !
call liza at 64444564.
school music clu

Dear Sirs,
I would like to participate in this activity. I am a junior student in XX middile school. My english score is good and accepted. My IELTS score is 7.0, and meanwhile, I am good at teaching and get other mate across in the afterschool study group. Therefore, I think I am capable of this job. Finally it make sense to bring knowledge to younger brothers and sisters based on my capability. Please put my sincere application into consideration.
I am looking forward to your reply.
Best Regards
Li Hua

P.E club Recruit.Three conditions are required.you should be intersted in sporting.you are supposed to do well in ball games.being free after class.If you are capable of the listed three conditions and would like be a member,welcome to contact me,Dong Hua,Tel:638-9902.

招募启事
“ 湛江‘创卫’大家谈”论坛 将于 本月6日（星期六）上午9时—11时 在 湛江市图书馆一楼演播厅 举行。现招募 30位热心市民参加 本次活动，共同 为我市“创卫”献计献策 。 报名截至本月5号，报名及咨询电话：1234567 。
湛江市“创卫”办公室
2013年7月1日

第 届亚运会于 年 月 日至 日在中国广州进行，为了做好接待工作，组委会招募了 名男志愿者和 名女志愿者，调查发现，男、女志愿者中分别有 人和 人喜爱运动，其余不喜爱．
（1）根据以上数据完成以下 列联表：

喜爱运动
不喜爱运动
总计
男
10

16
女
6

14
总计


30
(2)能否在犯错误的概率不超过 的前提下认为性别与喜爱运动有关？
(3)如果从喜欢运动的女志愿者中(其中恰有 人会外语)，抽取 名负责翻译工作，则抽出的志愿者中 人都能胜任翻译工作的概率是多少？
附: K ² =
P ( K ² ≥ k )
0.100
0.050
0.025
0.010
0.001
k
2.706
3.841
5.024
6.635
10.828

(1) 2×2 列联表如下：

喜爱运动
不喜爱运动
总计

开头和结尾已经给出

优点：目标管理法的评价标准直接反映员工的工作内容,结果易于观测,所以很少出现评价失误,也适合对员工提供建议,进行反馈和辅导.由于目标管理的过程是员工共同参与的过程,因此,员工工作积极性大为提高,增强了责任心和事业心. 缺点：目标管理法没有在不同部门,不同员工之间设立统一目标,因此难以对员工和不同部门之间的工作绩效横向比较,不能为以后的晋升决策提供依据
两种不同的管理人员招募形式︰
内部选聘的优点：①内部选聘能对企业职工能产生激励作用.②内部选聘所获得的人员的素质比较保险可靠.③企业对内部选聘的人员比较了解,内部选聘的人员对企业的目标、发展过程和存在的问题比较了解,能很快胜任工作.④可节约费用.
⒈内部晋升的缺点：①内部人才一脉相承,“近亲繁殖”,往往在观念上和思考中因循守旧,思考范围狭窄,缺乏创新与活力.②在甄选过程中容易引起同事间的过度竞争,发生内耗.
外部选聘的优点：①外部选聘有利于因事求才,广招贤人.②曾有工作经历的外聘人才往往能带来外单位的先进工作经验,他们的到来如同新鲜血液注入企业,能够增加企业活力.
⒉外部征聘的缺点：①外聘人才与用人单位职工之间因缺乏了解,故易产生配合上的困难,工作适应阶段较长.②任用外部人才担任管理职务,会使企业职工感到升迁无望,从而挫伤工作积极性.③外部征聘比通过内部晋升获取人才的费用高
必要性：①环境的变化　　②管理权力的分散　③工作能力的差异 ④组织内部复杂局面⑤偏差的累积⑥成本领先是企业竞争优势
管理制度控制的基本原则①合规性原则②一致性原则③统一性原则④严谨性原则⑤明确性原则⑥务实性原则
管理控制的基本过程①建立绩效标准②衡量实际绩效③比较标准与实际绩效的差异④评估差异结果并采取必要的修正行动
三、计算题
1新建车间净收益：400*0.3 +200*0.5-110=110
扩建车间净收益 300*0.3 +150*0.5+75*0.2-50=130
选择扩建车间
2悲观的态度:选损失最小的.就是选小批量.也就是6
乐观的态度:选取其中最大的则是120,也就是大批量
后悔值法是,销路一般的后悔值分别为：40,13,31 销路差的后悔值分别为：128,91,66
大批量的后悔为40和128则选40,中小批量分别为13和31 .选最大的为40 .则选大批量.
折衷原则选大批量
3①设销量为a、b、c .A地区：（2.65-1.75）*a-5000=10000 a=5555
B地区2.65-1.75）×b﹣5500＝10000,b=5000 C地区,2.65-1.75）×c-5800=10000,c=4667
②A（2.65-1.75）×21000-5000=13900 B,2.65-1.75）×22000﹣5500＝14300,C,2.65-1.75）×23000-5800=14900, C地区盈利最多
41）设y为总成本,x为产量）
A：y=25万+11x
B：y=10万+30x
C：y=15万+20x
D：y=20万+35x
2产量为0~5000时,B为最优.
产量为5000~11111时,C为最优.
产量大于11111（11112~ ）时,A为最优
（3）A 33.8万
B 34万
C 31万
D 48万
所以选C

we take 3 months to team recruting and preparing

Dear sir
I'm Li Hua , a aboy of sixteen , presently a senior student in Guangming Middle School I am 16 years old. I am writing to you so as to apply for that job .
On the other hand, my spoken English is very good ,and i think English is important to us , as the society develop faster and faster , English had become one of the communication language .
Then my hobby is do sports ,such as football and swimming . I like reading the book which can tell me that how to improve our environment . I am interested in this job and i want to accede to you .
I am a student with the charcter of patience and i am fridendly and outgoing . I have the confence to be competent for the job . If i can eough to get the job , I will do my best to improve our environment . looking forward to your reply.
Yours
LIHua

B

Cover letter: you are applying for the position you advertised, born in 1984, graduated from Shenzhen Polytechnic in July, is a professional e-commerce

Hello everybody i wanna be a zhuxi