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单项选择题

数字用户线路接入种类很多，其中非对称数字用户线是 (64) 。光纤接入网有多种，其中 (65) 是最理想的。

A．ADSL
B．VDSL
C．ISDN
D．HDSL

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热门试题

单项选择题在Windows 2003操作系统中，如需要经常对多台计算机进行“远程桌面”管理，可在“运行”窗口中输入 (66) 命令。

A．command
B．msconfig
C．RIS
D．MMC

单项选择题A. names B. eookies C. software D. extensions

As administrators seek to block dangerous email attachments through the recognition of well- known (69) , virus writers use other extensions to circumvent such protection. Executable (.exe) files are renamed to . bat and . cnd plus a whole list of other extensions and will still run and successfully infect target users. Frequently, hackers try to penetrate networks by sending an attachment that looks like a flash movie, which, while displaying some cute animation, simultaneously runs commands in the background to steal your passwords and give the (70) access to your network.