單項選擇題

（）(舷墻排水孔) permits the escape of water.

A. A wash port
B. A bulwark port
C. A+B
D. Bulkhead

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單項選擇題

The （）(排水孔) is a deck drain.

A.jackstaff
B.bilge bracket
C.scupper
D.ensign

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