A.at sea
B.on land
C.in the air
D.throughout the world
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A.COSPAS-SARSAT
B.ground receiving stations
C.spacecraft
D.satellite SAR instrument
A.anywhere in the world
B.at sea
C.in the air
D.ashore
A.1982
B.1980
C.1984
D.1988
A.alerting
B.on-scene communication
C.safety information
D.general communication
A.sometimes
B.all times
C.never
D.partly
最新試題
If the beacon is mounted at a wrong place, it may（）by sea water, chemicals, exhaust and vibrations.
International Navtex service means the coordinated broadcast and automatic reception on（）khz of maritime safety information by narrow-band direct-printing telegraphy using English language.
For COSPAS-SARSAT system,（）usually transmit initial COSPAS-SARSAT alert.
SafetyNet is an international service for the broadcast and automatic reception of MSI by means of direct-printing through（）system.
COSPAS-SARSAT is intended to be used for（）.
The vessel has stayed in port for seven days because she needs（）.
The rescue coordination center may（）on stations which interfere with traffic.
The priority of EGC messages is classified by（）.
Every lifeboat which is fitted with a fixed two-way（）radiotelephone apparatus with an antenna which is separately mounted shall be provided with arrangements for sitting and securing the antenna effectively in its operating position.
The quality of EGC messages is（）affected by the position of the ship, the time of reception and climatic conditions.