單項(xiàng)選擇題Fixed C02 systems would not be used on crew’s quarters or（）.

A.the paint locker
B.spaces open to the atmospere
C.cargo holds
D.the engine room


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1.單項(xiàng)選擇題Foam extinguishes a fire by（）.

A.shutting off the air supply
B.cooling the fule to below ignition temperature
C.dispersing the fuel
D.removing the source of ignition

2.單項(xiàng)選擇題Foam-type portable fire extinguishers are more usefull in combating fires involving（）.

A.solid materials such as wood or bales of fiber
B.inflammable liquids
C.electrical equipment
D.metallic solids

3.單項(xiàng)選擇題For a floating vessel, the center of buoyancy and the metacenter are in the line of action of the buoyant force（）.

A.only when there is positive stability
B.only when there is negative stability
C.only when there is neutral stability
D.at all times

4.單項(xiàng)選擇題For a floating vessel,the center of the floating is the point in the waterpiane.（）.

A.aboat which the vessel lists and trims
B.which coincides with the center of buoyancy
C.which, in the absence of external forces, is always vertically aligned with the center of gravity
D.which is shown in the hydrostatic tables as VCB

5.單項(xiàng)選擇題For a floating vessel,the result of subtracting KG from KM is the（）.

A.height of the metacenter
B.height of the righting arm
C.height of the center of buoyancy
D.metacentric height