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【单选题】
有两台主机 A 和 B 接在 800 m 长的电缆线的两端,并在 t=0 时各自向对方发送一个帧,长度为 1500 bit(包括首部和前同步码)。假定在 A 和 B 之间有 4 个转发器,在转发帧时会产生 20 比特的,设传输速率为 100 Mbit/s,而 CSMA/CD 的退避时间是随机数 r 倍的争用期,争用期为 512 bit,在发生第一次碰撞后,在退避时 A 选 r=0,而 B 选择 r= 1。忽略发生碰撞后的人为干扰信号和帧间最小间隔。设信号的传播速率是 2*10^8 m/s,试计算从 A 到 B (包括 4 个转发器)的传播。(3-34)
A.
4 μs
B.
4.8 μs
C.
79.8 μs
D.
29.4 μs
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参考答案:
举一反三
【单选题】氡(α衰变)半衰期为4天,经过8天后,其剩余量为多少?
A.
1/2
B.
1/4
C.
1/8
D.
1/16
【简答题】翻译:A budget can help you manage your spending to save for short-term needs-like books for the upcoming semester---and future goals, such as spring break vacations, trips with friends.
【简答题】Sentence translation. a) A budget can help you manage your spending to save for short-term needs-like books for the upcoming semester---and future goals, such as spring break vacations, trips with fri...
【简答题】A budget can help you manage your spending to save for short-term needs-like books for the upcoming semester---and future goals, such as spring break vacations, trips with friends.
【单选题】氡(α衰变)半衰期为4天,经过8天后,其剩余量为多少?
A.
0.5
B.
0.25
C.
0.125
D.
0.0625
【简答题】Manage your budget: make sure you’re ready to pay with the (3) _____ procedures.
【简答题】Sentence translation. a) A budget can help you manage your spending to save for short-term needs-like books for the upcoming semester---and future goals, such as spring break vacations, trips with fri...
【多选题】电焊条由焊芯和药皮两部分组成。药皮的主要作用有()。
A.
机械保护作用
B.
冶金处理作用
C.
改善焊接工艺性能
【简答题】Sentence translation. A budget can help you manage your spending to save for short-term needs-like books for the upcoming semester---and future goals, such as spring break vacations, trips with friend...
【判断题】A budget can not help you manage your spending to save for short-term needs-like books for the upcoming semester---and future goals, such as spring break vacations, trips with friends.
A.
正确
B.
错误
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