问题 单项选择题

根据布线标准ANSI/TIA/EIA.568A,综合布线系统分为如图7.1所示的6个子系统。其中的①、②、③应分别填入______。

答案

参考答案:A

解析:[要点解析] 根据国际电子工业协会(EIA)和国际电信工业协会(TIA)于2002年制定的结构化布线系统标准(EIA/TIA 568B)与中国工程建设标准化协会制定的标准《建筑与建筑群综合布线系统工程设计规范》,结构化综合布线系统分为建筑群子系统、设备间子系统、垂直干线子系统、管理子系统、水平布线子系统和工作区子系统等6个部分,各子系统的组成部分及其说明见表7-7。

表7-7 各子系统所包含的范围及其说明
子系统 组成部分
建筑群子系统 由两个及两个以上建筑物的电话、数据、电视系统组成一个建筑群子系统,它是室外设备与室
内网络设备的接口,它终结进入建筑物的铜缆和/或光缆,提供避雷及电源超荷保护等
设备间子系统 由综合布线系统的建筑物进线设备,电话、数据、计算机等各种主机设备及其保安配线设备等
组成,每个工作区根据用户要求,设置1个电话机接口和1~2个计算机终端接口
垂直干线子系
由设备间的配线设备和跳线,以及设备间至各楼层配线间的连接电缆组成
管理子系统 设置在每层配线设备的房间内,是由交接间的配线设备、输入/输出设备等组成
水平布线子系
由工作区用的信息插座,每层配线设备至信息捅座的配线电缆、楼层配线设备和跳线等组成
工作区子系统 由配线(水平)布线系统的信息插座延伸到工作站终端设备处的连接电缆及适配器组成
在图7-1中,①为工作区子系统,②为设备间子系统,③为建筑群子系统。

单项选择题
单项选择题

C

Danielle Steel, America’ s sweetheart, is one of the hardest working women in the book business. Unlike other productive authors who write one book at a time, she can work on up to five. Her research time before writing takes at least three years. Once she has fully studied her subjects, ready to dive into a book, she can spend twenty hours nonstop at her desk.

Danielle Steel comes from New York and was sent to France for her education. After graduation, she worked in the public relations and advertising industries. Later she started a job as a writer which she was best fit for. Her achievements are unbelievable: 390 million copies of books in print, nearly fifty New York Times best-selling novels, and a series of "Max and Martha" picture books for children to help them deal with the real-life problems of death, new hobbies and new schools. Her 1998 book about the death of her son shot to the top of the New York Times best-selling list as soon as it came out. Twenty-eight of her books have been made into films. She is listed in the Guinness Book of World Records for one of her books being the Times best-seller for 381 weeks straight.

Not content with a big house, a loving family, and a view of the Golden Gate Bridge, Danielle Steel considers her readers to be the most important resource (资源) and has kept in touch with them by e-mail. While she is often compared to the heroines (女主人公) of her own invention, her life is undoubtedly much quieter. But, if she does have anything in common with them, it is her strength of will and her inimitable(无与伦比的) style. There is only one Danielle Steel.

Danielle Steel is different from other writers in that().

A. she can write several books at the same time

B. she often does some research before writing a book

C. she is one of the most popular American women writers

D. she can keep writing for quite a long time without a break