1、 河 北 建 筑 工 程 学 院 本科毕业设计（论文）外文资料翻译 系别： 电气工程系 专业： 建筑电气与智能化 班级： 电智 072 姓名： 王延龙 学号： 2007318230 外文出处： Electricity 附 件： 1、外文原文； 2、外文资料翻译译文。 指导教师评语： 该 外文翻译 语言流畅通顺，较准确完整地翻译了原文，所翻译文章与毕业设计的课题基本相关，基本达到了本科毕业 外文翻译 的要求 签字： 2011 年 05 月 28 日 weak electricity engineering System function The in common use building we
2、ak electricity system mainly has a few kinds as follows: (1)The telephone corresponds by letter system Carry out telephone(include three types of facsimile machines, can see a telephone.etc.) correspondence function The star type To rushes toward structure； Use 3 types(or above) dont shield a double
3、 to wring line, deliver the frequency of signal within the scope of audio frequency. (2)Area net system in calculator bureau Is a realization to transact to automate and various data delivers of network foundation The star type to rushes toward structure Use 5 types(or above) dont shield a double to
4、 wring line, deliver number signal, the baud rate can reach to a 100 mbs the s is above. (3)Music| broadcast system The loudspeaker passed to install on the spot(is like places, such as market, restaurant, guest room and hallway.etc.) broadcasts music, and can pass to transmit sound machine to carry
5、 on a broadcasting to the spot Many road total line structure Deliver is certainly pressed a 120 Vs by the power enlarger outputs| the audio frequency signal of 120 s with drive the spot loudspeaker phonation, deliver the line use copper Xin to insulate to lead line. (4)The cabled T.V. signal assign
6、s system Evenly assign the cabled T.V. signal to each customer inside the building to order ；Adopt branch and assign a machine to carry on a signal allotment, for letting up signal to lose to really reduce and make each customer order the request that the signal quality attains norm rules with , its
7、 cloth line is tree type structure, and order to distribute with the form of building and the customer of dissimilarity but dissimilarity Use 75 radio frequency coaxial cable, deliver many road radio frequencies signal. (5)The public security supervises and controls system The camera passed to insta
8、ll on the spot, guard against theft equipment like carry on surveillance and excrescent circumstance to report to the police to each exit and entrance and some important places of building etc. ；The video frequency signal delivers to adopt star type structure, use video frequency coaxial cable ；Control delivering of signal to adopt total line structure, the use copper insulates a cable.
