單項選擇題The atmosphere in a tank is too lean if it is（）.

A.incapable of supporting combustion because the hydrocarbon content is below the LFL (Lower Flammable Limit)
B.capable of supporting combustion because the hydrocarbon content is above the UFL (Upper Flammable Limit)
C.capable of supporting a fire once started
D.not safe for ballasting


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1.單項選擇題The all-purpose nozzle will produce a fog spray when you（）.

A.pull the nozzle handle all the way back toward the operator
B.pull the nozzle handle back to a position where the handle is perpendicular to the plane of the nozzle
C.push the nozzle handle forward as far as it will go
D.insert a fog applicator between the fire hose and nozzle

2.單項選擇題Small quantities of flammable liquids needed at a work site should be（）.

A.used only under the supervision and direction of a ship's officer
B.tightly capped and stowed with other tools near the job site when securing at the end of the day
C.used only when a pressurized fire hose is laid out ready for immediate use
D.in a metal container with a tight cap

4.單項選擇題Shipping society approved buoyant work vests are considered to be items of safety equipment and may be worn by members of the crew（）.

A.in lieu of life preservers during fire drills
B.in lieu of life preservers during boat drills
C.in lieu of life preservers during an actual emergency
D.when carrying out duties near a weather deck's edge

5.單項選擇題Removing which will extinguish a fire?（）.

A.Nitrogen
B.Carbon dioxide
C.Sodium
D.Oxygen