计算机通过电话网拨号方式上网时，异步传输的字符同步，下列选项(18)的说法是正确的；采用数据位为8位的异步起止方式传输数据时，其效率最高为(19)，高级数据链路控制规程(HDLC)是(20)提出的标准；HDLC帧同步标志是(21)；HDLC协议为保证帧同步标志路上传输时的惟一性，对数据进行的处理是(22)字节。
- A．异步传输起始位一般有2位，而停止位有1位或2位
- B．异步传输都采用单一单位编码，且起始位、停止位常为1位
- C．异步传输常采用单一单位编码，但可用5、7、8位制中的任一种
- D．异步传输起始位一般有1位、2位，而停止位只有1位
-
(72)
- A．above
- B．around
- C．about
- D．abort
-
(71)
- A．get
- B．ignore
- C．require
- D．offer
-
(70)
- A．client
- B．browser
- C．server
- D．router
-
(69)
- A．supertext
- B．plaintext
- C．hypertext
- D．ciphertext
-
Because Web servers are platform. and application(71)they can send or request data from legacy or external applications including databases. All replies, once converted into(72)mark-up language, can then be transmitted to a(73). Used in this way, Intranets can(74)lower desktop support costs, easy links with legacy applications and databases and,(75)all, ease of use.
- A．related
- B．dependent
- C．coupled
- D．independent
-
(75)is not a programming language.
- A．COBOL
- B．Java
- C．UML
- D．Basic
-
A small network may only connect two computers inside a home to share, a single printer and Internet(74).
- A．connect
- B．connecting
- C．connection
- D．connective
-
There are several applications called Web(73)that make it easy to access the World Wide Web. two of the most popular being Netscape Navigator and Microsoft' s Internet Explorer.
- A．views
- B．homepages
- C．browsers
- D．sites
-
Users also need(71)systems to help them explore the web and discover interesting data sources and interfaces that support different query and search paradigms.
- A．negative
- B．adaptive
- C．passive
- D．adaption
-
The smallest physical units on a hard disk are called(72).
- A．Tracks
- B．Clusters
- C．Sectors
- D．Cylinders
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