单项选择题
A.jackstaff B.bilge bracket C.scupper D.ensign
（）(富余水深) is the depth remaining under a ship’s bottom.A...
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
Is this a （）(淡水) tank?A. bilge waterB. ballast waterC. ...
单项选择题Is this a （）(淡水) tank?
A. bilge water B. ballast water C. fresh water D. sea water
That is the （）(污水井).A. bilge wellB. ballast waterC. fre...
单项选择题That is the （）(污水井).
A. bilge well B. ballast water C. fresh water D. sea water
