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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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

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

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