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【多选题】
下列关于域名的描述正确的是( )
A.
域名是用有意的字母或数字组合来表示的
B.
域名系统采用层次结构，各个层次由小圆点隔开，分成层次字段
C.
域名的作用和 IP地址的作用是一样的，都是用来标识互联网上的主机资源
D.
域名方便人们访问互联网资源，但是计算机在相互通信能辨认 IP地址而非域名
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