A.promote
B.improve
C.guarantee
D.both A and B
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A.taking the place of the radio system
B.introducing a new life-saving system
C.saving the vessels in distress
D.improving the communication on land
A.was suffering
B.is suffering
C.has suffered
D.has been suffering
A.see
B.seeing
C.be seen
D.being seen
A.where
B.when
C.after
D.unless
A.That
B./
C.When
D.What
最新試題
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 frequency（）the safety message will be transmitted shall be included in DSC safety call.
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（）.
Ship-to-ship distress alerting should be conducted by（）.
Monitoring is especially important in a highly automated system which is dependent on careful（）procedure and format.
The rescue coordination center may（）on stations which interfere with traffic.
Before GMDSS, if the radio officer on board is serious ill,（）.
Radio beacon can be activated（）in case of distress.
If the beacon is mounted at a wrong place, it may（）by sea water, chemicals, exhaust and vibrations.