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问题 选择题

按成员性质、地理范围和职能范围划分，联合国属_____、______、____国际组织。

A．政府间、全球性、一般性

B．非政府间、全球性、专门性

C．政府间、全球性、专门性

D．非政府间、地区性、一般性

答案

答案：A

选择题

我国宪法第33条规定：“任何公民享有宪法和法律规定的权利，同时必须履行宪法和法律规定的义务。”宪法这一规定表明[ ]

A、公民的权利等同于义务

B、公民先享有权利后履行义务

C、公民有选择义务的权利

D、公民的权利和义务相辅相成，不可分离
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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.slot B.switch C.process D.fire

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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