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单选题
There are（）operational satellites in the INMARSAT system covering the whole globe except the polar regions.
A
3
B
4
C
8
D
12
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set ntp time 64.32.129.3B
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单选题Which operational mode command can be used to synchronize the local system time with an NTP server?（）A
set ntp time 64.32.129.3B
set clock ntp 64.32.129.3C
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communications in the whole system will stopB
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Space segment, NCC, RCC, SES and CESB
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The satellites are in equatorial orbits around the earth about 60°of longitude apartC
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