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單項選擇題

（）(富余水深) is the depth remaining under a ship’s bottom.

A. Under-keel height
B. Under-keel clearance
C. Under-keel draft
D. Under-keel depth

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單項選擇題

Is this a （）(淡水) tank?

A. bilge water
B. ballast water
C. fresh water
D. sea water

單項選擇題

That is the （）(污水井).

A. bilge well
B. ballast water
C. fresh water
D. sea water

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