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
Radio communication（）for many years and helps to save tens of thousands of lives.
Ship-to-ship distress alerting should be conducted by（）.
Every lifeboat which is fitted with a fixed two-way vhf radiotelephone apparatus with（）which is separately mounted shall be provided with arrangements for sitting and securing the antenna effectively in its operating position.
The frequency（）the safety message will be transmitted shall be included in DSC safety call.
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.
By using（）system a ship can send a distress message and know with certainty it will be received.
On-scene communications will normally take place between（）.
If the beacon is mounted at a wrong place, it may（）by sea water, chemicals, exhaust and vibrations.
Before GMDSS, if the radio officer on board is serious ill,（）.