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【多选题】
什么是DNS( )A.
DNS是指：域名服务器(Domain Name Server)。
B.
在Internet上域名与IP地址之间是一一对应的。
C.
域名虽然便于人们记忆，但机器之间只能互相认识IP地址，它们之间的转换工作称为 域名解析。
D.
域名解析需要由专门的域名解析服务器来完成，DNS就是进行域名解析的服务器。
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B.
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A.
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