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單項(xiàng)選擇題

The transmission of messages respecting the dangers specified is free（）cost to the ships concerned.

A.of
B.on
C.at
D.in

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單項(xiàng)選擇題

The use of this rule does not relieve vessels（）their obligations to comply with the local laws.

A.from
B.of
C.off
D.over

單項(xiàng)選擇題

The vessel ahead（）you is stopped.

A.before
B.from
C.of
D.away

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