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单选题

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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正确答案：A （备注：此答案有误）

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