单项选择题
With the help of GMDSS（）can be alerted to a distress incident as soon as possible.
A.all ships in a large sea area
B.only the sea authorities ashore
C.the SAR units ashore and at sea
D.the port radios and the coast stations
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相关考题
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单项选择题
The Inmarsat system is open for use by（）countries on a non-discriminatory basis.
A.some
B.lots of
C.many
D.all -
单项选择题
Within the polar areas it is（）to see a satellite in geo-stationary orbit .
A.impossible
B.possible
C.easy
D.difficult -
单项选择题
The quality of the message can be affected by（）.
A.climate
B.sunshine
C.human beings
D.both a and b
