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单选题
Diesel fuel vapors （）.
A
can not be ignited by a spark unless the vapor is in a confined space
B
are nontoxic in all concentrations
C
can not be ignited by a spark unless they are at their auto-ignition temperature
D
are heavier than air
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advanced fuel ignitionC
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excessive fuel nozzle holder coolingB
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单选题If the diesel fuel vapors present are within the flammable range （）.A
the vapor air mixture is too rich to burnB
an explosion may occur if a source of ignition is presentC
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单选题Which of the following statements is least likely to cause the ignition of fuel vapors?（）A
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单选题Which statement is TRUE concerning fuel vapors on a vessel（）.A
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考题
单选题What is LEAST likely to cause ignition of fuel vapors?（）.A
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