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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单项选择题

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

单项选择题

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

单项选择题

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