单选题Which action must be taken when an individual cargo tank is closed off from the inert gas system by the tank isolation valve?（）AThe tank must be gas freedBThe tank must be ballastedCThe tank must be vented to the atmosphereDThe bypass valve must also be closed
单选题
Which 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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