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
Ship-to-ship distress alerting should be conducted by（）.
The quality of EGC messages is（）affected by the position of the ship, the time of reception and climatic conditions.
（）will form the basis for distress alerting and safety calling.
In case a ship is in emergency or distress in any of 4 areas, it is required to use the continuous（）alert.
If the beacon is mounted at a wrong place, it may（）by sea water, chemicals, exhaust and vibrations.
Monitoring is especially important in a highly automated system which is dependent on careful（）procedure and format.
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.
Before GMDSS, if the radio officer on board is serious ill,（）.
SOLAS ships shall be equipped with（）.
Radio communication（）for many years and helps to save tens of thousands of lives.