URL consists of three parts: the protocol(75), the DNS name of the host (www.csai.cn) and the file name (index.html).

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问题 URL consists of three parts: the protocol(75), the DNS name of the host (www.csai.cn) and the file name (index.html).

选项 A、IP
B、UDP
C、TCP
D、HTTP

答案D

解析参考译文：URL由三个部分组成：HTTP协议、主机的DNS名(如www.csai.cn)和文件名(index.html)。

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