A.two
B.three
C.more than two
D.more than three
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A.as many as three
B.more than two
C.less than two
D.up to four
A.3
B.4
C.8
D.12
A.besides the polar regions
B.including the North Pole and the South Pole
C.above 70°N and below 70°S
D.as for north and south as 70°
A.be transmitted at once though the frequency is not clear
B.be transmitted as soon as the frequency is cleared coordinately
C.be transmitted at its scheduled transmissions
D.be transmitted at next scheduled transmissions
A.meteorological warnings
B.navigational warnings
C.search and rescue information
D.meteorological forecast
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The advantage of geostationary satellites is（）.
All coast radio stations（）DSC installed for VHF and HF.
The quality of EGC messages is（）affected by the position of the ship, the time of reception and climatic conditions.
At least two two-way VHF radiotelephone apparatus shall be provided on every cargo ship of（）tons gross tonnage and upwards but less than 500 tons gross tonnage.
The vessel has stayed in port for seven days because she needs（）.
The rescue coordination center may（）on stations which interfere with traffic.
Please use（）for（）.
If the beacon is mounted at a wrong place, it may（）by sea water, chemicals, exhaust and vibrations.
Particular care should be（）in selecting CESs in areas where Ocean Regions overlap.
The frequency（）the safety message will be transmitted shall be included in DSC safety call.