單項(xiàng)選擇題One of the principal dangers inherent in liquefied petroleum gas is（）.

A.as it warms up it becomes heavier than air
B.the way it reacts with sea water
C.the strong odor it produces
D.its low temperature causes frostbite or freezing


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1.單項(xiàng)選擇題Inerting means（）.

A.the introduction of inert gas into a tank with the object of reducing the oxygen content to below 8% by volume
B.the introduction of inert gas into a gas free tank for the purpose of reducing the oxygen content to below 8% by volume
C.the introduction of inert gas into a cargo tank during cargo discharge to replace the volume of discharged cargo
D.All of the above

2.單項(xiàng)選擇題In setting the valves on a steam-smothering system on a tank vessel，the master control valve to cargo tanks should be（）.

A.open and individual tank valves open
B.open and the individual tank valves closed
C.closed and the individual tank valves closed
D.closed and the individual tank valves open

3.單項(xiàng)選擇題If you are fighting a fire below the main deck of your vessel，which action is most importantconcerning the stability of the vessel? （）

A.Shutting off electricity to damaged cables
B.Pumping fire-fighting water overboard
C.Maneuvering the vessel so the fire is on the lee side
D.Removing burned debris from the cargo hold

5.單項(xiàng)選擇題Hoses used for cargo transfer operations must be tested and inspected at specified intervals by（）.

A.a representative of the Captain of the Port
B.the operator of the vessel or facility
C.a representative of the National Cargo Bureau
D.low inert gas temperature