A.has made
B.make
C.has been made
D.is making
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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
A.transmit
B.to transmitting
C.transmitting
D.in transmitting
A.strike
B.strikes
C.are striking
D.struck
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If the beacon is mounted at a wrong place, it may（）by sea water, chemicals, exhaust and vibrations.
The rescue coordination center may（）on stations which interfere with traffic.
Before GMDSS, if the radio officer on board is serious ill,（）.
Stations in the United States of America are grouped by states arranged in the alphabetical order of their（）.
The quality of EGC messages is（）affected by the position of the ship, the time of reception and climatic conditions.
Radiotelephony communication or radio telex communication or both will be carried out by terrestrial or satellite means,（）the equipment fitted on ship and the area in which the incident occurs.
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.
COSPAS-SARSAT is intended to be used for（）.
As each MSI message will have a unique identity, the printing of messages already received correctly is（）.
All coast radio stations（）DSC installed for VHF and HF.