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【简答题】
(课本习题3-22)假定在使用CSMA/CD协议的10Mbit/s以太网中某个站在发送数据时检测到碰撞,执行退避算法时选择了随机数r=100。这个站需要等待多长时间后再次发送?如果是100Mbit/s的以太网呢?(要写计算过程)
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举一反三
【单选题】The Virgin Islands are located ______.
A.
in the Gulf of Mexico
B.
in the Pacific Ocean
C.
in the North Sea
D.
in the Caribbean Sea
【单选题】Which. of the following is NOT the reason why people prefer to use virgin' materials than use secondary ones?
A.
Production costs do not include the true costs of environmental impact.
B.
There axe subsidies to virgin materials.
C.
Using virgin materials can protect environment.
D.
The secondary materials are more expensive.
【简答题】The virgin forest with its richness and variety of trees was a veritable real treasure-house which extended from Maine all the way down to Georgia. 请将上面这段话翻译成中文，谢谢！
【单选题】The creation of Virgin Cola, Virgin Air, Virgin Rail and Virgin Bride is an example of _______________.
A.
brand stretching
B.
brand awareness
C.
brand management
D.
brand loyalty
【简答题】The creation of Virgin Cola, Virgin Air, Virgin Rail and Virgin Bride is an example of brand_______________.
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