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單項選擇題

The GMDSS must combine all various subsystems, because（）.

A.they all have different limitations with respect to coverage
B.they all have different limitations in the technology they use
C.different systems apply to different ships
D.all of above

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單項選擇題

（）communication are intership VHF radio telephone communication.

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

單項選擇題

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

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