A.or
B.and
C.but
D.unless
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A.identify
B.identifier
C.identity
D.identification
A.seen
B.sighted
C.watched
D.located
A.At least two years after the last entry
B.At least one year after the last entry
C.At least 90 days after the last entry
D.At least 30 days after the last entry
A.6 months
B.1 year
C.2 years
D.3 years
A.A conditional or partial exemption may be granted，in exceptional circumstances，for a single voyage outside the sea area for which the vessel is equipped
B.Once a compulsory vessel's GMDSS station has been fitted and inspected，the station must be inspected only once every five years
C.All passenger vessels and all cargo vessels that are 300 Gross Tons or larger must comply
D.Compulsory vessels must carry at least two licensed GMDSS Radio Operators
最新試題
In case a ship is in emergency or distress in any of 4 areas, it is required to use the continuous（）alert.
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.
Stations in the United States of America are grouped by states arranged in the alphabetical order of their（）.
If the beacon is mounted at a wrong place, it may（）by sea water, chemicals, exhaust and vibrations.
（）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 quality of EGC messages is（）affected by the position of the ship, the time of reception and climatic conditions.
Particular care should be（）in selecting CESs in areas where Ocean Regions overlap.
The vessel has stayed in port for seven days because she needs（）.
Radio beacon can be activated（）in case of distress.
The frequency（）the safety message will be transmitted shall be included in DSC safety call.