单项选择题
（）(舷墙排水孔) permits the escape of water.
A. A wash port
B. A bulwark port
C. A+B
D. Bulkhead
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The （）(排水孔) is a deck drain.
A.jackstaff
B.bilge bracket
C.scupper
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单项选择题
（）(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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Is this a （）(淡水) tank?
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B. ballast water
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