A.some
B.lots of
C.many
D.all
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A.impossible
B.possible
C.easy
D.difficult
A.55.5 W
B.180E
C.15.5W
D.64.5E
A.one means, whether satellite or terrestrial techniques
B.two means, whether satellite or terrestrial techniques
C.two separate and independent means, each using different radio communication services
D.two means, such as MF DSC and HF DSC
A.satellite /terrestrial system
B.INMAARSAT/COSPAS-SARSAT
C.SART / EPIRB
D.geostationary/polar-orbiting satellites
A.enable SAR operations to start with minimum delay
B.give facilities to marine communication
C.reduce sharply the chances of ship’s sinking
D.both A and C
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.
The advantage of geostationary satellites is（）.
We consider（）send a helicopter with medical facilities to the distress area.
Please use（）for（）.
The rescue coordination center may（）on stations which interfere with traffic.
All coast radio stations（）DSC installed for VHF and HF.
Radio beacon can be activated（）in case of distress.
By using（）system a ship can send a distress message and know with certainty it will be received.
Radio communication（）for many years and helps to save tens of thousands of lives.
The frequency（）the safety message will be transmitted shall be included in DSC safety call.