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


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2.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

4.單項選擇題International Navtex service is（）.

A.a terrestrial MF system
B.a satellite communication system
C.a land HF radio system
D.a coastal VHF system

5.單項選擇題What language does International NAVTEX use?（）

A.Russian
B.French
C.English
D.German