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單項(xiàng)選擇題

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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單項(xiàng)選擇題

The Inmarsat system is open for use by（）countries on a non-discriminatory basis.

A.some
B.lots of
C.many
D.all

單項(xiàng)選擇題

Within the polar areas it is（）to see a satellite in geo-stationary orbit .

A.impossible
B.possible
C.easy
D.difficult

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