单项选择题

What action must be taken when an individual cargo tank is closed off from the inert gas system by the tank isolation valve?（）

A.The tank must be gas freed
B.The tank must be ballasted
C.The tank must be vented to the atmosphere
D.The bypass valve must also be closed

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单项选择题
Using an inert gas system on a tanker has which advantage(s)? （）

A.Provides for faster loading
B.Lowers oxygen content in the tank
C.Provides better fuel economy
D.All of the above
单项选择题
Upon arrival at the discharging port，the inert gas system is（）.

A.turned on
B.turning on
C.turn on
D.to turn on
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