单项选择题
A.the weight of the ship's structure and its machinery B.bunker and other consumable loads C.ballast loads D.all those weights，such as the weight of the bunkers，ballast，provisions and cargo
The extension of the after part of the keel in a single...
单项选择题The extension of the after part of the keel in a single-screw vessel upon which the stern post rests is called the（）.
A.boss B.knuckle C.skeg D.strut
For existing ships，（）is not an improvement to safety.A....
单项选择题For existing ships，（）is not an improvement to safety.
A.the reinforcement of the aft transverse watertight bulkhead B.the double bottom structure in way of the foremost cargo hold C.the introduction of a more rigorous survey regime and greater attention to operating procedures D.introduction of new and improved designs
Floors aboard ship are（）.A.frames to which the tank top...
单项选择题Floors aboard ship are（）.
A.frames to which the tank top and bottom shell are fastened on a double bottomed ship B.transverse members of the ships frame which support the decks C.longitudinal beams in the extreme bottom of a ship from which the ship's ribs start D.longitudinal angle bars fastened to a surface for strength
