A.enter the system / contact an RCC
B.access to INMARSAT / establish contact with a CES
C.have absolute priority to enter the system / make contact with a CES
D.enter the system gradually / wait for rescue
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A.easy and expensive
B.simple and certain
C.dangerous and stable
D.difficult and compulsory
A.1980
B.1981
C.1979
D.1982
A.assist
B.send a rescue vessel
C.search the distress area
D.reach the distress position at once
A.alternation
B.alternate
C.alter
D.alternative
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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（）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.
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.
SafetyNet is an international service for the broadcast and automatic reception of MSI by means of direct-printing through（）system.
The advantage of geostationary satellites is（）.
Particular care should be（）in selecting CESs in areas where Ocean Regions overlap.
（）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.
The priority of EGC messages is classified by（）.
If the beacon is mounted at a wrong place, it may（）by sea water, chemicals, exhaust and vibrations.
COSPAS-SARSAT is intended to be used for（）.