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單項選擇題

The captain wants to see the （）.

A. chief officer
B. second officer
C. third officer
D. carpenter

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單項選擇題

Echo sounder sends a（） (無線電信號)from the bottom of the ship to the seabed.

A. radio signal
B. radio wave
C. signal
D. signal radio

單項選擇題

Radar is of great help to ship in poor（）(能見度).

A.visibility
B.VHF
C.visible
D.compass

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