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
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In case a ship is in emergency or distress in any of 4 areas, it is required to use the continuous（）alert.
Every lifeboat which is fitted with a fixed two-way（）radiotelephone apparatus with an antenna which is separately mounted shall be provided with arrangements for sitting and securing the antenna effectively in its operating position.
The frequency（）the safety message will be transmitted shall be included in DSC safety call.
SOLAS ships shall be equipped with（）.
Monitoring is especially important in a highly automated system which is dependent on careful（）procedure and format.
The vessel has stayed in port for seven days because she needs（）.
Can MF/HF radiotelephone receive the MSI sent from the coast stations alone?（）
We consider（）send a helicopter with medical facilities to the distress area.
Stations in the United States of America are grouped by states arranged in the alphabetical order of their（）.
SafetyNet is an international service for the broadcast and automatic reception of MSI by means of direct-printing through（）system.