采用频率复用可以:()。
A、增加信道利用率.
B、增加容量,但减少干扰.
C、增加了容量和干扰.
D、增加信道利用率,但减少干扰.
参考答案:A
______ by the terrible earthquake, Wenchuan, a city in Sichuan province, was _____ from the outside. [ ]
A. Having struck; cut up
B. Struck; cut down
C. Having struck; cut out
D. Struck; cut off
热情服务是公安工作贯彻群众路线的重要方面,是公安机关执法思想的核心。 ( )