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