As with all ITU standards,reduce energy consumption is a key factor taken into account at development stage.Indeed NGN sare believed to offer significant saving()traditional networks.
A. of
B. over
C. at
D. in
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地球静止轨道卫星的轨道平面与赤道平面重合,卫星轨道离地球高度为()。
A. 1414Km
B. 780Km
C. 1500Km
D. 35800Km
在通信专业中,TDM的英文全称是()
A. Time Delay Method
B. Transmission Delay Method
C. Time Division Multiplexing
D. Time Dividing Multiplexing
Wireless telecommunications networks are generally implemented and administered using()communication
A. microwave
B. radio
C. FM
D. AM
关于程序设计语言,下列说法错误的是()。
A. 汇编语言用助记符表示机器指令,语句与机器语言一一对应
B. 高级语言编写的源程序需编译或解释才能运行,其中解释程序会产生目标文件,链接后产生可执行文件
C. 机器语言比高级语言可移植性差
D. 数据库语言都属于4GL语言(第四代语言)