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【判断题】
发送时延是发送数据所需要的时间。它取决于数据块的长度和数据在信道上的发送速率。重发时延是因为数据在传输中出了差错就要重新传送,因而增加了总的数据传输时间。A.
正确
B.
错误
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举一反三
【单选题】Haley cited the examples of Joe Delaney and Harry Belafbnte to show that ____.
A.
some people never succeed despite their hard work
B.
people who have dreams have to suffer
C.
people have to make sacrifices to live creatively
D.
successful artists always have dreams
【单选题】Haley cited the examples of Joe Delaney and Harry Belafonte to show that
A.
some people never succeed despite their hard work
B.
people have to make sacrifices to live creatively
C.
people who have dreams have to suffer
D.
successful artists always have dreams
【单选题】Haley cited the examples of oe Delaney and Harry Belafonte to show that ________
A.
some people never succeed despite their hard work
B.
people who have dreams have to suffer
C.
people have to make sacrafices to live creatively
D.
successful artists always have dreams
【单选题】Haley cited the examples of Joe Delaney and Harry Belafonte to show that ________.
A.
some people never succeed despite their hard work
B.
people who have dreams to suffer
C.
people have to make sacrifices to live creatively
D.
successful artists always have dreams
【判断题】P87. 1. T or F. 1. We may get on well with many people, but we make friends
with only a few of them.
A.
正确
B.
错误
【单选题】Haley cited the examples of Joe Delaney and Harry Belafonte to show that ____.
A.
some people never succeed despite their hard work
B.
people who have dreams have to suffer
C.
people have to make sacrifices to live creatively
D.
successful artists always have dreams
【单选题】第3章: 在狭义相对论中,下列说法中哪些是正确的: (1) 一 切 运动物 体 相对于 观察者 的速度 不能 大于 真空 中 的 光速; (2) 质量 、长度、时间的测量结果都是随物体与观察着者的相对运动状态而改变的; (3) 在 一 惯性系 中发生 于同 一时刻 、不同地点的两个事件在其他一切惯性系中也是同时发生的; (4) 惯性 系 中 的 观察者 观察 一 个 与 他 作匀 速 相对运动 的...
A.
(1) (2) (4) ；
B.
(1) (3) ；
C.
(1) (2) (3) ；
D.
(3) (4) 。
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