A.occasionally
B.accidentally
C.often
D.usually
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A.keep
B.kept
C.are keeping
D.have kept
A.has made
B.make
C.has been made
D.is making
A.When the distress alert is sounded
B.When the emergency equipment is switching on
C.When the general emergency alarm is sounded
D.When the distress broadcast is sounded
A.When
B.Where
C.how
D.that
A.If
B.Whenever
C.Because
D.Where
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The vessel has stayed in port for seven days because she needs（）.
SOLAS ships shall be equipped with（）.
Before GMDSS, if the radio officer on board is serious ill,（）.
On-scene communications will normally take place between（）.
The frequency（）the safety message will be transmitted shall be included in DSC safety call.
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 vhf radiotelephone apparatus with（）which is separately mounted shall be provided with arrangements for sitting and securing the antenna effectively in its operating position.
Stations in the United States of America are grouped by states arranged in the alphabetical order of their（）.
We consider（）send a helicopter with medical facilities to the distress area.
All coast radio stations（）DSC installed for VHF and HF.