题目内容

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

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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

ADSL采用的多路复用技术是(21),最大传输距离可达(22)米。 (22)处填()。

A. 500
B. 1000
C. 5000
D. 10000

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