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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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