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问题 单项选择题

数字化模数转换器的其中一个参数是存储深度，即一个波形可存储的数据点是多少或称数据（）。

A、速度

B、密度

C、深度

D、长度

答案

参考答案：D

简答题

遇到下列情境，你会怎么做？

情   境
你的做法
进入中学大门，成为一名中学生，既感到很高兴，但又感到孤单。
 
转学到外地，那里课本不同，讲话口音不同，老师讲课方法也不同，感到很苦恼。
 
高高兴兴地去学校，但发现所读的学校并不是自己理想的学校。
                                                                               
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单项选择题

A typical application of this (71) is ADSL. It is emerging as the technology for home-and small-office Internet connectivity. It provides either 1.5 Mb/s～8 Mb/s from the network to the user and 64 Kb/s～512 Kb/s in the reverse direction depending on the distance, 12 000 or 18 000 feet.. The different speed for each direction gives it the (72) label. ADSL is designed to take advantage of the fact that video-on demand, telecommuting, and Internet access traffic are inherently asymmetrical. The user (73) a brief message up to the network and receives a ton of data coming back, either a movie or a piece of data download. Under such a scenario, low-speed traffic to the network is just fine. ADSL delivers high (74) where you need it and only uses a single copper pair. Through multiplexing, it also reserves (75) of the bandwidth for POTS.

A．FTTH

B．HFC

C．FTTC

D．HDSL
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