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
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On-scene communications will normally take place between（）.
（）by an ice-breaker, it is important to maintain a continuous listening watch on the appropriate VHF channel and to maintain a proper look-out for sound and visual signals.
Please use（）for（）.
All coast radio stations（）DSC installed for VHF and HF.
If the beacon is mounted at a wrong place, it may（）by sea water, chemicals, exhaust and vibrations.
The frequency（）the safety message will be transmitted shall be included in DSC safety call.
Particular care should be（）in selecting CESs in areas where Ocean Regions overlap.
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.
For COSPAS-SARSAT system,（）usually transmit initial COSPAS-SARSAT alert.
The quality of EGC messages is（）affected by the position of the ship, the time of reception and climatic conditions.