填空题 A ____is needed to access a page on the WWW.
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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
判断题 FTP is a protocol for file transfer. ( ) 对 ( ) 错
A. 对
B. 错
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