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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

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出自：海船船员证

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