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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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考题
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smoother engine operationB
advanced fuel ignitionC
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单选题Faulty operation of diesel engine fuel injection nozzles can be a direct cause of（）.A
excessive fuel nozzle holder coolingB
sediment in the fuel supplyC
distortion of the fuel spray patternD
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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What causes diesel fuel to be ignited in the cylinder of an operating diesel engine?（）A
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单选题Which may ignite fuel vapors?（）A
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to fuel oil instead of diesel oilB
for fuel oil instead of diesel oilC
to diesel oil into fuel oilD
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单选题Which statement is TRUE concerning fuel vapors on a vessel（）.A
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单选题Turbulence in a diesel engine cylinder is of major importance in providing （）.A
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考题
单选题The most effective method in removing water from diesel fuel oil is by（）A
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考题
单选题What is LEAST likely to cause ignition of fuel vapors?（）.A
Static electricityB
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Loose wiringD
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