單項選擇題A fire starting by spontaneous combustion can be expected in which condition?（）.

A.Paints, varnish, or other liquid flammables are stowed in a dry stores locker
B.Inert cargoes such as pig iron are loaded in a wet condition
C.Oily rags are stowed in a metal pail
D.Clean mattresses are stored in contact with an electric light bulb


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1.單項選擇題A floating vessel will behave as if all of its weight is zcting downward through the（）.

A.center of gravity
B.center of buoyancy
C.center of flotation
D.metacenter

2.單項選擇題A flooded lifeboat on board a vessel would adversely affect the vessel’s stabbility by（）.

A.increasing the righting moment
B.decreasing the vessel's displacement
C.increasing the reserve buoyancy
D.shifting the CG(center of gravity) off center

3.單項選擇題A fuel line breaks, sprays fuel on the hot exhaust manifold, and catches fire. Your first action should be to（）.

A.Batten down the engine room
B.start the fire pump
C.apply carbon dioxide to the fire
D.shut off the fuel supply

4.單項選擇題A fuel-air mixture below the lower explosive limit is too（）.

A.rich to burn
B.lean to burn
C.cool to burn
D.dense to burn

5.單項選擇題A gas-free certificate would usually be issued by a (n)（）.

A.CCS marine surveyor
B.certified marine chemist
C.port engineer
D.HAS marine inspector