异步传输模式技术中“异步”的含义是_______。’
A．采用的是异步串行通信技术
B．网络接口采用的是异步控制方式
C．周期性地插入ATM信元
D．随时插入ATM信元
参考答案：D
解析：[知识点] 网络新技术[评析] CCITT给ATM提出的建议定义认为：ATM是一种转换模式，在这一模式中，信息被组成“信元”，而包含一段信息的信元并不需要周期性的出现，换句话说，信元和信元之间的时间间隔可以是不固定的，即随机的，所以叫做“异步传输”。
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| There is nobody in the world the same 1 you; you are unique (独特唯一的)! Everybody is 2 from everyone else. That is good! 3 it makes the world (世界) an interesting place. There are people taller 4 you, and shorter than you. Maybe your hair is the same color as your friend's hair, but maybe it is longer than 5 . Another difference is your hair may be straight, hers may be curly. I am sure you have some friends who are 6 than you. And you also have some friends, they are as 7 at sports as you. But there are also people around you who are not good at some things. 8 does your best friend look like? Do you both 9 to finish your homework at school? Do you both want to wear the same clothes every day? I think 10 some ways you are the same, but in many other ways you are different. So say loudly to the world, "I am who I am-I'm unique!" | ||||
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