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單項(xiàng)選擇題

（）communication are intership VHF radio telephone communication.

A.ship-to-shore
B.shore-to-ship
C.bridge-to-bridge

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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 geostationary orbit.

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

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