Without permission of（）, a ship earth station can not enter the system.

单项选择题An SES operator can chose the most suitable CESs according to（）.

A.the routing agreement for a particular ocean region
B.The communication service he required
C.the positions of his ship and the CESs
D.B and C

单项选择题The NCS of INMARSAT-A system in the AOR-E is in（）.

A.Goonhilly, UK
B.Yamaguchi, Japan
C.Perth, Australia
D.Southbury, USA

单项选择题Each NCS woks as a type of（）, assisting controlling and monitoring telex and telephone network as quickly as possible.

A.switch operator
B.communication gateway
C.national operator
D.on-scene commande

单项选择题The position of the AOR-W satellite in the INMARSAT system is（）above the equator.

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

单项选择题Geostationary satellite are artificial satellite which（）.

A.always move slowly
B.are in one place only
C.sometimes move and sometime don‟t
D.synchronize with the movement of the earth