单项选择题
The complying vessels can transmit ship-to-shore distress alerts by at least（）.
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
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相关考题
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单项选择题
The GMDSS is a world-wide communication network combining（）with（）.
A.satellite /terrestrial system
B.INMAARSAT/COSPAS-SARSAT
C.SART / EPIRB
D.geostationary/polar-orbiting satellites -
单项选择题
The general benefit of the GMDSS is to（）.
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 -
单项选择题
By using previous communication system, rescue is often a matter of chance. What does “a matter of chance” mean?（）
A.occasionally
B.accidentally
C.often
D.usually
