A.all ships in a large sea area
B.only the sea authorities ashore
C.the SAR units ashore and at sea
D.the port radios and the coast stations
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A.some
B.lots of
C.many
D.all
A.impossible
B.possible
C.easy
D.difficult
A.climate
B.sunshine
C.human beings
D.both a and b
A.One means, whether satellite or terrestrial techniques
B.Two means, whether satellite or terrestrial techniques
C.Two separate and independent means, each using different radio communication services
D.Two means, such as MF DSC and HF DSC
A.all large passenger vessels
B.freighters of more than 300gt in coastal waters
C.all passenger ships and cargo ships engaged in international-voyages
D.all passenger ships and cargo ships of 300gt upwards in open sea
最新試題
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.
Particular care should be（）in selecting CESs in areas where Ocean Regions overlap.
The quality of EGC messages is（）affected by the position of the ship, the time of reception and climatic conditions.
All coast radio stations（）DSC installed for VHF and HF.
（）will form the basis for distress alerting and safety calling.
Please use（）for（）.
Radiotelephony communication or radio telex communication or both will be carried out by terrestrial or satellite means,（）the equipment fitted on ship and the area in which the incident occurs.
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.
Radio communication（）for many years and helps to save tens of thousands of lives.