下列关于移动通信网络覆盖方式的描述中,正确的是( )。[1分]
100()[1分]
99()[1分]
98()[1分]
The approaching 4G mobile communication systems are projected to ( ) still remaining problems of 3G systems and to provide ( ) newservices ,from high-quality voice to high-definition video to high data-rate wireless channels.[1分]
Deploying enhanced broadband services over existing network infrastructure ( )in increase of the network complexity and therefore,extraexpenses on network management and maintenanc
The approaching 4G mobile communication systems are projected to ( ) still remaining problems of 3G systems and to provide ( ) newservices ,from high-quality voice to high-definition video to high data-rate wireless channels.[1分]
4G is the fourth generation wireless technology adopted by the ( ) and carriers around the worl
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]
分布式数据库中的数据分布在不同节点上,有的事务分解成不同节点上的多个局部事务,若某个局部事务不能正常提交,则必须撤销所有其他节点已提交的局部事务。事务的这种性质,被称为事务的( )。[1分]
在通信专业中,WDM的英文全称是( ),“吞吐量”英文通常翻译为( )。[1分]
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