关于VoIP系统中网守的描述中，正确的是

A.进行信号调制

B.进行号码查询

C.确定网关地址

D.进行信号压缩与解压

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  B、短信挑战

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• WWW服务使用的协议为（）。

  A、HTML

  B、HTTP

  C、SMTP

  D、FTP

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  C、Alice, Reena, and Timber

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