单项选择题

The position if the IOR satellite in the INMARSAT system is（）above the equator.

A.64.5E
B.178E
C.15.5W
D.54W

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单项选择题

There are some back-up satellites in the event of failure. If the operational satellite is out of work,（）.

A.communications in the whole system will stop
B.the global system will be damaged
C.the back-up one will take its place
D.the whole system will not work

单项选择题

The satellites over the major ocean regions cover the globe（）.

A.besides the polar regions
B.including the North Pole and the South Pole
C.above 70N and below 70S
D.as far north and south 70

单项选择题

（）is a space system using one or more artificial earth satellites.

A.satellite network
B.Satellite Link
C.INMARSAT
D.Satellite System