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
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相关考题
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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 -
单项选择题
We（）a sharp lookout while sailing in the iced waters.
A.keep
B.kept
C.are keeping
D.have kept
