單項(xiàng)選擇題A disk with a horizontal line through its center, equivalent to the summer load line, is called the（）.

A.deadrise mark
B.maximum alloable draft mark
C.pilmsoll mark
D.tonnage mark


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1.單項(xiàng)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

2.單項(xiàng)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

3.單項(xiàng)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

4.單項(xiàng)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

5.單項(xiàng)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