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
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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.
The first-year experience is exciting, liberating and terrifying, all combined to help us grow into adulthood. That is, if our parents don’t come with us.(para 4)
A. The first-year experience is exciting, liberating and terrifying, all combined to help us grow into adulthood. That is going to happen if our parents don’t come with us.
B. The first-year experience is exciting, liberating and terrifying, all combined to help us grow into adulthood. That is to say, if our parents don’t come with us.
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