單項(xiàng)選擇題At all angles of inclination, the metacenter is（）.

A.vertically above the center of buoyancy
B.vertically above the center of gravity
C.at the intersection of the upright vertical centerline and the line of action of the buoyant force
D.at the geometric center of the underwater volume


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1.單項(xiàng)選擇題At all angles of inclination, the ttrue measure of a vessel''s stability is the（）.

A.metacentric height
B.displacement
C.righting moment
D.inclining moment

2.單項(xiàng)選擇題Atmosphere laden with coal dust or grain dust caused by loading these cargoes（）.

A.require loading operations to be shut down until the atmosphere clears
B.are toxic to human life
C.are subject to spontaneous combustion
D.may be explosive in some concentrations

3.單項(xiàng)選擇題Bags are usually stowed in between the bulk grain（）.

A.to ventilate the hold
B.to separate the cargo
C.to replace shifting boards
D.to facilitate stowage

4.單項(xiàng)選擇題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（）.

A.for securing a snatch block when snaking cargo into the wings of the hold
B.to prevent cargo from coming in contact with the vessel's frames or shell plating
C.tp prevent fittings to which cargo lashing may be secured
D.to support the dunnage floors which are laid down between tiere of cargo

5.單項(xiàng)選擇題Beams are cambered to（）.

A.increase their strength
B.provide drainage from the decks
C.relieve deck stress
D.All of the above