题目内容

填空题 The ____is a standard identifier for specifying information on the Internet

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填空题 A ____is needed to access a page on the WWW.

填空题 THe URL defines four things:,,, and .

填空题 Each IP consists of ____bytes.

判断题 SMTP is a protocol for file transfer. ( ) 对 ( ) 错

A. 对
B. 错