对路由器A配置RIP协议,并在接口S0(IP地址为10.0.0.1/24)所在网段使能RIP路由协议,在系统视图下使用的第一条命令是()。
A. Rip
B. rip10.0.0.0
C. network10.0.0.1
D. network10.0.0.0
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What is the wavelength, if the frequency is 6MHz?
A. 180m
B. 18m
C. 50m
D. 500m
A ship operating in sea area A1 must have the following provisions of maintenance:
A. Shore maintenance
B. Duplication of equipment
C. At Sea Maintenance
D. Any one of these
Which of the following systems is most likely to be subject to fading or static interference?
A. HF NBDP
B. INMARSAT
C. Digital Selective Calling on channel 70
D. VHF ARQ
What is the approximate range of VHF radio waves during the day time?
A. 30 nautical miles
B. 600 nautical miles
C. 150 nautical miles
D. 1200 nautical miles