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After a fire has been extinguished in a closed space, personnel may safely enter the space when （）.
A:smoke density has been decreased sufficiently to see the bulkhead opposite the compartments entrance
B:a lifeline and explosion proof flash light are used
C:all smoke and toxic fumes are removed and an adequate oxygen supply is present
D:overhaul has been completed to remove any possible source of re-ignition

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出自：海船船员证

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