Ｅ－ｍａｉｌ地址格式中，（）是分隔符，用于分隔用户名和域名。

D.

若把Web站点视为图书馆中的（），Web页则是书中的某一页。

4G is the fourth generation wireless technology adopted by the （ ） and carriers around the worl

字长是CPU一次性处理的数据位数，是衡量计算机性能的重要指标，现今流行的主要职能手机CPU字长为（ ）。[1分]

关于程序设计语言，下列说法错误的是（ ）。[1分]

Nobody had predicted the scale of impact of （ ） communications and that it world be one of the largest businesses in the history of mankind with and immense impact on all economies.[1分]

Deploying enhanced broadband services over existing network infrastructure （ ）in increase of the network complexity and therefore,extra expenses on network management and maintenanc

下列属于系统软件的是（ ）。[1分]

下列不属于操作系统功能的是（ ）。[1分]

The approaching 4G mobile communication systems are projected to （ ） still remaining problems of 3G systems and to provide （ ） new services ,from high-quality voice to high-definition video to high data-rate wireless channels.[1分]