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單項選擇題

Exchange of answerbacks act s a confirmation that the messages（）at the destination.

A.have received
B.have been received
C.are received
D.are being received

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單項選擇題

The distance between the two NAVTEX stations with the same B1 character should be not exceed（）nautical miles.

A.400
B.240
C.450
D.180

單項選擇題

The NAVTEX receiver can be mounted on（）.

A.on the bridge
B.in the coast station
C.on the forecastle
D.on starboard side

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