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计算机网络作业三及解答(1).doc
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计算机网络作业三及解答
D
several group number, then with b ± a, =c,c is is methyl b two vertical box between of accurate size. Per-2~3 measurement, such as proceeds of c values are equal and equal to the design value, then the vertical installation accurate. For example a, b, and c valueswhile on horizontal vertical errors for measurement, General in iron angle code bit at measurement level points grid errors, specific method is from baseline to methyl vertical box center line distance for a,, to b vertical box distance for b, list can measured
several group number, then with b ± a, =c,c is is methyl b two vertical box between of accurate size. Per-2~3 measurement, such as proceeds of c values are equal and equal to the design value, then the vertical installation accurate. For example a, b, and c valueswhile on horizontal vertical errors for measurement, General in iron angle code bit at measurement level points grid errors, specific method is from baseline to methyl vertical box center line distance for a,, to b vertical box distance for b, list can measured
several group number, then with b ± a, =c,c is is methyl b two vertical box between of accurate size. Per-2~3 measurement, such as proceeds of c values are equal and equal to the design value, then the vertical installation accurate. For example a, b, and c valueswhile on horizontal vertical errors for measurement, General in iron angle code bit at measurement level points grid errors, specific method is from baseline to methyl vertical box center line distance for a,, to b vertical box distance for b, list can measured
several group number, then with b ± a, =c,c is is methyl b two vertical box between of accurate size. Per-2~3 measurement, such as proceeds of c values are equal and equal to the design value, then the vertical installation accurate. For example a, b, and c valueswhile on horizontal vertical errors for measurement, General in iron angle code bit at measurement level points grid errors, specific method is from baseline to methyl vertical box center line distance for a,, to b vertical box distance for b, list can measured
信噪比为 30dB,则该系统的最大数据传输速率
为( )。
A.3kbit/s B.6kbit/s
C.30kbit/s D.64kbit/s
10.二进制信号在信噪比为 127:1 的 4kHz 信
道上传输,最大的数据速率可达到( )。
A.28000bit/s B.8000bit/s
C.4000bit/s D.可以是无限大
11.下列有关曼彻斯特编码的叙述正确的是
( )。
A.每个信号起始边界作为时钟信号有利于
同步
B.将时钟与数据取值都包含在信号中
C.这种模拟信号的编码机制特别适合于传
输声音
D.每位的中间不跳变表示信号的取值为 O
12.在网络中,把语音与计算机产生的数字、文
字、图形与图像同时传输,必须先把语音信号数
字化。下列可以把语音信号数字化的技术是
( )。
A.曼彻斯特编码 B.QAM
C.差分曼彻斯特编码 D.脉冲编码调
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