单项选择题
If there has been a fire in a closed unventilated compartment it may be unsafe to enter because of （）.
A.unburned carbon particles
B.excess nitrogen
C.a lack of oxygen
D.excess hydrogen
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相关考题
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单项选择题
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 -
单项选择题
Which of the petroleum products listed has the lowest flash point?（）
A.Hydraulic oil
B.Lubricating oil
C.Diesel oil
D.Refrigeration oil -
单项选择题
Which of the listed fire extinguishers is recommended for use on an electrical switchboard fire?（）
A.CO2
B.ABC dry chemical
C.CO2 propelled foam
D.All of the above
