问题：
[单选] Ballast water can only be（）in cargo tanks in exceptional cases where the particular character of the operation of an oil tanker renders it necessary to carry ballast water in excess of the quantity required，provided that such operation of the oil tanker falls under the category of exceptional cases as established by the Organization.
carried。contained。filled。stuffed。
问题：
[单选] Battens are fitted in cargo holds across the frames of the vessel from the turn of the bilge upward. The purpose of these cargo battens is（）.
for securing a snatch block when snaking cargo into the wings of the hold。to prevent cargo from coming in contact with the vessel's frames or shell plating。to provide fittings to which cargo lashings may be secured。to support the dunnage floors which are laid down between tiers of cargo。
问题：
[单选] Camber，in a ship，is usually measured in（）.
feet per feet of breadth。feet per feet of length。inches per feet of breadth。inches per feet of length。
问题：
[单选] Compared to internal structural plating，the exterior hull plating on a vessel is usually（）.
stronger。thinner。more corrosion resistant。a lower grade steel。
问题：
[单选] Concentrated heavy loads are involved in loading a LASH vessel. What does NOT require close attention due to such loads while working cargo?（） .
GM - available and required。Longitudinal stress numeral。Tons per inch immersion numeral。Draft。
问题：
[单选] Deck beams on a vessel are generally spaced at equal intervals and run（）.
longitudinally。vertically。transversely。intermittently。
问题：
[单选] Floors aboard ship are（）.
also called decks。vertical transverse plates connecting the vertical keel with the margin plates。large beams fitted in various parts of the vessel for additional strength。found in passenger and berthing spaces only。
问题：
[单选] Floors aboard ship are（）.
frames to which the tank top and bottom shell are fastened on a double bottomed ship。transverse members of the ships frame which support the decks。longitudinal beams in the extreme bottom of a ship from which the ship's ribs start。longitudinal angle bars fastened to a surface for strength。
问题：
[单选] Frames to which the tank top and bottom shell are fastened are called（）.
floors。intercostals。stringers。tank top support。
问题：
[单选] If a vessel is sagging，what kind of stress is placed on the sheer strake?（）
Compression。Tension。Thrust。Racking。
