单选题After a fire has been extinguished in a closed space, personnel may safely enter the space when （）.Asmoke density has been decreased sufficiently to see the bulkhead opposite the compartments entranceBa lifeline and explosion proof flash light are usedCall smoke and toxic fumes are removed and an adequate oxygen supply is presentDoverhaul has been completed to remove any possible source of re-ignition
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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