A.alternation
B.alternate
C.alter
D.alternative
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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
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
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（）will form the basis for distress alerting and safety calling.
By using（）system a ship can send a distress message and know with certainty it will be received.
Please use（）for（）.
Every ship constructed on or after（）shall comply with all the applicable requirements of this chapter.
On-scene communications will normally take place between（）.
Radio communication（）for many years and helps to save tens of thousands of lives.
The rescue coordination center may（）on stations which interfere with traffic.
COSPAS-SARSAT is intended to be used for（）.
SafetyNet is an international service for the broadcast and automatic reception of MSI by means of direct-printing through（）system.
Stations in the United States of America are grouped by states arranged in the alphabetical order of their（）.