在开发一个系统时,如果用户对系统的目标不是很清楚,难以定义需求,这时最好使用()。
A. 专利权
B. 商标权
C. 著作权
D. 财产权
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Wind stations would not be a solution to the state's energy needs if______.
A. they were not built on the windiest hills
B. ways to store the generated power were not found
C. they were used only for commercial purposes
D. ways were not found to increase the wind speed
设信号的波特率为600Baud,采用幅度一相位复合调制技术,由4种幅度和8种相位组成16种码元,则信道的数据速率为()。
A. 600b/s
B. 2400b/s
C. 4800b/s
D. 9600b/s
下列路由协议中,()用于AS之间的路由选择。
A. RIP
B. OSPF
C. IS-IS
D. BGP
在路由表中设置一条默认路由,目标地址应为(46),子网掩码应为(47)。 (47)处填()。
A. 0.0.0.0
B. 255.0.0.0
C. 0.0.0.255
D. 255.255.255.255