[单选] 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-ignitio

面对新形势、新任务、新要求，烟草行业要全面提升哪“五个形象”？中心金库执行副主任和库管人员双人在监控录像下打开代保管抵质押品专用款箱，核对（）一致后，登记“代保管抵质押品明细账”，将封包入库保管。柜员登记簿。出纳登记簿。封包数量与名称。涂装车间规定（）不准补漆。 A级面。 B级面。 C级面。 D级面。全行业要思考、谋划、实践的“三大课题”是什么？（），应及时通知营业网点，由相关业务人员核实后重新封包。需要封包。发现封包破损。封包完好。 After a fire has been extinguished in a closed space, personnel may safely enter the space when （）.

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[单选] After a fire has been extinguished in a closed space, personnel may safely enter the space when （）.

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