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  • ID:8141-2552
    network architecture

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  • ID:8141-2582
    software crisis

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  • ID:8141-1787

    The diskette at a fixed speed of about 300 revolutions per minute.

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  • ID:8141-2569
    (阅读选择)The Internet, then known as ARPANET, was brought online in 1969, which initially connected four major computers at universities in the southwestern US . The early Internet was used by computer experts , engineers, scientists, and librarians. There was nothing friendly about it. There were no home or office personal computers in those days, and anyone who used it, whether a computer professional or an engineer or scientist or librarian, had to learn to use a very complex system.

    The Internet matured in the 1970's as a result of the TCP/IP architecture. As the commands for E-mail, FTP , and telnet were standardized, it became a lot easier for non-technical people to learn to use the nets. It was not easy by today' s standards by any means, but it did open up use of the Internet to many more people in universities in particular. Other departments besides the libraries, computer, physics, and engineering departments found ways to make good use of the nets -- to communicate with colleagues around the world and to share files and resources.

    In 1991, the first really friendly interface to the Internet was developed at the UniversityofMinnesota. The University wanted to develop a simple menu system to access files and information on campus through their local network.

    Since the Internet was initially funded by the government, it was originally limited to research, education, and government uses. Commercial uses were prohibited unless they directly served the goals of research and education. This policy continued until the early 1990's, when independent commercial networks began to grow.

    Choose the best answer according to Passage

    1. How many computers were connected to the initial Internet in 1969 ?

    A. Ten B. Four C. Twenty D. Three

    2. Only could use the early Internet.

    A. computer experts, engineers, scientists, and librarians

    B. any experts, engineers, scientists, and librarians

    C. computer experts, engineers, scientists, and students

    D. experts, engineers, and scientists in universities in US

    3. The Internet became a lot easier for non-technical people to learn and use because of the common

    A. commands B. protocols C. topologies D. architecture

    4. The first really friendly interface to the Internet appeared with the introduction of a system for files and information access.

    A. computer B. operating C. menu D. application

    5. Which statement is not true according to the passage ?

    A. Many more people in universities began to use the Internet in the 1970s, but it wasn't as user-friendly as today's standards.

    B. The restrictions to commercial uses changed as the independent commercial networks were not funded by the government.

    C. Commercial uses were allowed for the early Internet if they directly served the goals of research and education.

    D. The early Internet was logged in from home or office personal computers.

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  • ID:8141-11999
    The attributes of the stack are .
    a. FIFO b. LIFO c. queue d. built into their circuitry

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  • ID:8141-1785

    (翻译)最后乔布斯提出要不就叫苹果电脑吧。他解释道:当时我只吃水果蔬菜,我又正好刚从苹果农场回来。苹果电脑听起来很有趣,有活力又不会让人产生距离感。苹果其实弱化了电脑这个科技词汇的概念,再说在电话簿上我们可是排在雅达利前面。乔布斯跟沃兹说,要是到截止期限的第二天下午他们都想不出更好的名字,那就用这个,于是苹果电脑真的成了公司的名字。苹果,这是个很妙的选择。这个单词会马上释放出友好和简单的信号,做到了既略有点不合常规,又很普通不古怪。有一点点反主流文化,又体现了返璞归真的质朴感,而且非常有美国特色。苹果和电脑,这两个单词放在一起,营造了一种有趣的分裂感。苹果电脑的首位投资人,后来成为公司第一任董事长的迈克·马克库拉(Mike Markkula)表示:其实这个名字没什么意义,不过它有种魔力,会让你细细回味其中的含义。苹果和电脑放一起,根本不搭嘛!但是正是这种不协调,帮我们增加了品牌的知名度。

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