I单项选择 1.抽样频率 a. sampling rate b. repetition rate c. sampling frequency 答案:c 2.数字通信 a. digital communication b. digital transmission. transmission path 答案:a

Word14 implementi mp manvt.实现,完成成 subscriber szh' ra) traffic[t raf]n.通讯(量),业务,信息量 architectural[a:ki 't ktfa ral]a.建筑上的,结构上的 denote[di' vt.表示,意味着 node[.节点

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1. The Internet is the largest repository of information which can provide very very large network resources. The network resources can be divided into

NEW WORDS AND PHRASES personalize[pa: sanal a iz]v.使个人化 convenient[kan'vi: n an t]a.便利的,方便的 rapidity[ra' p i d i t i]n.快,迅速 severe[si'via]a.严格的,严重的 estrict[ris' trik t]v.限制,约束 vary[' v Ear I]v.改变,变化,不同

asynchronous[a'si6 k ranas]a.异步的 serial[' sirian]a.串行的,串联的 transmission[ t raen z'mi∫an]a.传输,发送 interface[ i n taf e i s]r.接口

1. Historical Background 1607 Jamestown Colony, in Virginia. 1620 Plymouth Colony 1630 Massachusetts Bay Colony 1640 The Bay Psalm Book, the first publication in America

1. Historical Background Before 1860 the United States had begun to change into an industrial and urban society. In the years preceding the Civil War relatively few volumes of imaginative literature were published in the Us. But as the century progressed

1. Historical background The growth of mass-circulation periodicals created a rich market place for popular writers o WWi stands as a great dividing line between the 19th century and contemporary America o a sense of the failure of political leaders and a belief in the futility of hope dominated