單項選擇題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


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1.單項選擇題The NCS of INMARSAT-A system in the AOR-E is in（）.

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

2.單項選擇題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

4.單項選擇題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