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问题 选择题

"不和别人比父母，只和别人比明天。"这句话说明（ 　 ）

A．个人的成才与父母的培养没有关系

B．家庭条件优越往往不利于个人成才

C．我们无法选择出身，但应自立自强

D．对父母没有信心，只能寄希望于明天

答案

答案：C

题目分析：题文的意思是告诉我们要靠自己努力，不能只依靠父母，应该自立自强。所以答案选C。A说法在题文中没有体现。BD说法本身错误。

单项选择题

我国历史上最早的一次有记载的演讲是（）中的《甘誓》。

A.《左传》

B.《尚书》

C.《诗经》

D.《论语》
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单项选择题

Let us now see how randomization is done when a collision occurs. After a ______, time is divided into discrete slots whose length is equal to the worst-case round-trip propagation time on the ether (2t). To accommodate the longest path allowed by Ethernet, the slot tome has been set t0 512 bit times, or 51.2μsec.

A.unicastB.multicast C.broadcast D.interval

After the first collision, each station waits either 0 or 1 ______ times before trying again. If two stations collide and each one picks the same random number, they will collide again. After the second collision, each one picks either 0, 1, 2, or3 at random and waits that number of slot times. If a third collision occurs (the probability of this happening is 0.25), then the next time the number of slots to wait is chosen at ______ from the interval 0 to 23-1.
In general, after i collisions, a random number between 0 and 2i-1 is chosen, and that number of slots is skipped. However, after ten collisions have been reached, the randomization ______ is frozen at a maximum of 1023 slots. After 16 collisions, the controller throws in the towel and reports failure back to the computer. Further recovery is up to ______ layers.
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