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單項(xiàng)選擇題

In areas covered by Inmarsat HF can be used as an（）to satellite communications.

A.alternation
B.alternate
C.alter
D.alternative

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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

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