小朋友们,你们一定很喜欢看书吧?可是你们知道书是怎样印刷出来的吗?以前,我很喜欢看《蓝猫淘气三千问》这本书,其中一本介绍的是中国古代的四大发明,里面就有活字印刷术。原来,很早以前,古代的人印书是把字都可刻在一块木板上。后来,有个叫毕升的人,靠雕刻印刷度日,看到自己雕刻的\'木板,印完书后便被丢掉,非常心疼。他想:要是这些字能一个个拆下来就好了。于是,他挖来胶泥,用水调匀夯实,再把胶泥反复揉合,做成一个个长方块,在每块上面刻一个阳文反手字。刻好后,把这些泥字放进窑里,用火烧硬,泥活字就做好了。然后是制版,在一块铁板上铺一层松香和蜡之类的东西,四周围上铁框。在铁框内按照文章的字句、段落排列活字,排满一铁框后,就将铁板放到火上去烤。烘烤时,用一块平板在排好的活字版上加压,把字面压平整。冷却后,一块活字印版就制好了,就可以印刷了。这就是古代的活字印刷术
前几天,我们参观了郑州的一家现代化的印刷厂。现在科技很发达,也很方便,人们已经不用一个字一个字地排版了,而是直接用电脑排版了。排好版,把胶片放在自动显影机上,这样上面就有字了,可这些还都是黑色的,也是透明的。然后工作人员把这些胶片送到彩印车间,那里有四开四色印刷机,对开四色印刷机和对开八色印刷机。有的人要问,这下该好了吧?其实还没完,下面还有胶轮车间,也就是印刷车间。那里的纸都是一大卷一大卷的,纸从入口进去后往上走,然后从出口出去,这样字就印上去了。你可别小看这一大卷纸,它伸展开以后可达一万米呢!然后就是装订车间,在这里把印刷好的纸订在一起,然后用程控裁割机把它们裁齐。这样一本本书就做好了。
小朋友们,你们知道我们看的书是怎样印出来的了吗?印一本书需要这么多工序,以后我们一定要爱惜书本。
November **, ****
To Whom It May Concern:
This is to confirm that Mr. Li Dashui has worked as a full-time system analyst in the NY University since Jun 1994(or This letter is to verify that Mr. Li Dashui worked as an chemist from July 1993 to Sept. 1994. Mr. Lis main duties and responsibilities are as follows:
Design, develop and install various computer hardware, software and network systems for banks.
Determine and analyze the requirements of each system project into related componets solved through the application of computer technology.
Write specifications for computer programs, and test and implement programs for network systems and control systems.
Supervise computer programmers and other system analysts for paticular system projects.
Mr. Li has mainly taken part in the following projects:
The first engineering design of city general business computer network system.
Upgrading banks system for IBM AS/400 E45 to IBM AS/400 320, IBM AS/400 530.
The design development and test of city general business computer network system.
The design and development network and database systems for the Golden Credit Card Project.
Mr. Li is well experienced with IBM AS/400 system analysis, TCP/IP protocol, SNA protocol and LAN; proficient in RPGIII, VB, C/C++ and DB2, and skilled in UNIX, Informix, Client/Server etc.
Mr. Li is a hard-working and talented analyst, and is highly respected member in our company. If you need further information, please feel free to contact me. Sincerely yours, Singature, Zhang Jianguo
Senior Engineer and Technical Manage Company Name, Address, Tex Fax
中国加入 WTO 后,有一大批外国人来我市——河源参观,英语(导游介绍我市情况)。假设你是导游,请根据以下内容,向外宾简单介绍我市的情况。
要求: 1. 100 词左右; 2. 要点包括: a. 有悠久的历史,位于广东的东北部,离广州 198 公里,人口约 324 万。 b. 有许多名胜古迹,如苏家围( Sujiawei );万绿湖( WanluLake )等等;万绿湖是一个很美丽的\'地方,湖水清澈,无污染;湖中有各种各样的鱼;你可以到那里划船,野餐,钓鱼,是度假的好去处。你也可以去参观河源市博物馆,在那里你可以看到许多恐龙化石( fossil )。c. 祝大家在河源玩得愉快。
本文为您整理!
Ladies and gentlemen,
Welcome to Heyuan, now let me introduce our city — Heyuan to you.
___________________________________________________
( 2005 广东河源)
中考满分作文欣赏:
Ladies and gentlemen,
Welcome to Heyuan, now let me introduce our city — Heyuan to you. Heyuan is a city with a long history. It is in the northeast of Guangdong and 198 kilometres away from Guangzhou. It has a population of 3,240,000.
There are many places of interest in Heyuan, such as Sujiawei Wanlu Lake and so on. Wanlu Lake is a beautiful place. The water is clean and not polluted. There are all kinds of fish in it. You can go boating, go fishing and have a picnic there. It is really a good place to spend your holiday. Besides, you can go and visit Heyuan Museum. There you can see a lot of dinosaur egg fossils.
I hope you can enjoy yourselves in Heyuan.
Thank you.
Dear Sir/Madam:
As a teacher at xxxx school, I am writing to provide you a recommendation for Miss/Mr.xx so as to help you assess her/his application for acceptance into your program and consideration for financial aid.
Considered a promising student with originality and sophistication in her/his thinking, (she/he was asked, in the spring semester of 2008, to develop a subsystem of a DBMS project for her B.S.thesis, for which I was the chief leader. T
his subsystem was designed to manage the information of materials in NO.1 Foundry Plant of Dongfeng Auto Works.To do the job, she/he read many books about software engineering and took some courses in Database Principles and Management. Keenly aware that the design of a DBMS decides the quality of the whole software system, she did her/his utmost from the beginning of the project.(参加过什么活动. From analyzing users requirements to designing the whole system, from the detailed designing to the final programming, she was very level-headed and full of innovation every step of the way. Taking full advantage of her ability and creativity, she firmly focused herself on her objective and gnored all distractions. She successfully reached her goal. In the final software testing, only a few bugs were found in her subsystem. My appreciation of her talelent was thus confirmed.Miss is a very personable woman, friendly and helpful, and she has always been a team player in her work.
I would greatly appreciate it if you could give her application for candidacy to your Ph.D. program favorable consideration. Should you need any further information in your deliberation, please do not hesitate to contact me.
Sincerely xxxx
Dear Admission Committee:
Miss Pan Bei requested a letter of recommendation from me to support her application for graduate program at your university. As her teacher, I am pleased to comply with her request.
I first got to know Miss Pan when she enrolled at university and I was the assistant director of her class at that time. Being a professor for several years, I noticed that due to the lack of self-learning ability, it is really challenging for students, even those performing excellent in senior school, to keep up with the college speed. However, as a diligent girl without any solid background in Computer Science before college, she adapted quickly to the especially competitive environment in our department. At the end of the first year, she earned the 5th rank in her class, while ranking 1st among the girls. I was fairly impressed by her self-learning technique and exceptional efforts. Hence, I believe, goal-oriented, not afraid of inchoateness and with persistence, she has the quality to make achievements.
What distinguished her among her classmates, I think, was that she went far beyond acquiring excellent scores in the exams and instead got her range of knowledge enlarged. In spring, 2006, Miss Pan took the course I taught named Algebraic Structures and Combinatorial Mathematics. This inquisitive and assiduous young woman was sometimes the last to leave after my class, raising novel questions related to the subject. I found that she understood the knowledge in depth and detail. Furthermore, I still remember during the spring vocation in May, due to the break-down of my mail box, I missed her mails to discussing some questions. But the following week during the course time, she asked me directly. Her zeal for knowledge and the spirit to explore answers really leave me a deep impression. Finally, she was among the few students who got almost full marks in every test in class which showed her exceeding grasp of every chapter. Thus, I gave her 98/100 for the excellent performance in my course.
In summary, I have every reason to believe that Miss. Pan will make outstanding performance at your university as a graduate. I would appreciate greatly if you give her a favorable consideration. Please feel free to contact me directly if more assistance is needed. Faithfully yours,
Wanling Qu, Professor
Department of Computer Science and technology Peking University
Email: qwku.edu.cn
My mother
My mother is very kind and beautiful although she is not tall.She is 42 years old this year.She is a nurse,so she is always very busy day and night.But she loves her job,and she often takes care of her patients.Of course,she also likes singing,dancing,cooking and shopping,but she almost no time to do them.
Oh,I love my mother.
描写妈妈的英语作文:
My favorite sports star------ Sun Yang
Born on December 1, 1991 in Zhejiang Province, Sun Yang is very tall and the height is 1.99 meters. He was from a sports family.
He won the China's first gold medal in men's swimming game. He worked a miracle. Sun Yang is not only gifted but also diligent. He keeps training and has tenacious willpower; these are worth learning by other people. Sun Yang is a new frontrunner at the sports worlds.
Sun Yang is very popular with the young. He is adorable, charming, childlike and cool. He is kind and has the vigor of youth, and he is a little shy. But Sun Yang is easy-going, always with a smile on his face when he faces our. He sings well and sounds beautiful. To my surprise, he likes dolls very much.
Sun Yang sets us a good example, and Sun Yang has set a new world record of swimming, of which the whole country’s people are proud
It is safe for people to ride it when they go to work, and the price is not very high. What’s more, they are friendly to the environment as they save energy and make low noise.
Also , there are manyproblems with them. For example, the batteries must be replacedafter having been used for 300 to 400 times. If they are not changed in time, they would cause pollution again.
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