题目内容

局域网中最常用的传输介质是( )。

A. 无屏蔽双绞线
B. 粗同轴电缆
C. 单模光纤
D. 双模光纤

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在计算机网络中,表征数据传输可靠性的指标是( )。

A. 误码率
B. 频带利用率
C. 信道容量
D. 带宽

共有 4 个站进行码分多址 CDMA通信。四个站的码片序列为:A (-1-1-1+1+1-1+1+1)B(-1-1+1-1+1+1+1-1)C(-1+1-1+1+1+1-1-1)D(-1+1-1-1-1-1+1-1)收到这样的码片序列: (-1+1-3+1-1-3+1+1)。请问哪几个站发送数据了?

A、B、C
B、C、D
C. A、B、D
D. A、C、D

物理层的协议数据单元( Protocol Data Unit ,PDU)是什么?

A. 比特流 (Bits)
B. 帧( frame)
C. 分组( Packet)
D. 分段( Segment)

Choose the answer that correctly interprets the sentence from the text.Too many baby-boomer parents are overly concerned with success. They just don’t want to let go.(para16)

A. Too many baby-boomer parents care too much about success. They just don’t want to let go.
B. Too many baby-boomer parents are overly concerned with their children. They just don’t want to let them go.

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