单项选择题
The ability of a fuel particle to travel into the combustion chamber before burning is called （）.
A.penetration
B.permanence
C.turbulence
D.atomization
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Proper atomization of fuel in diesel engine combustion chambers will （）.
A.affect the injection pressure
B.improve combustion
C.reduce compression pressure
D.decrease power output -
单项选择题
All of the diesel engine cylinder firing pressures are normal, yet all of the exhaust temperatures are lowWhich of the following situations is responsible for this condition?（）
A.Excessively early injection timing
B.Combustion knock
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单项选择题
Which statement about diesel engine combustion is true?（）
A.Combustion does not begin until the piston starts down on the power stroke
B.Maximum combustion pressure is reached before TDC
C.Turbulence in the cylinder causes a delay in ignition
D.Maximum cylinder firing pressure is not developed until the piston passes TDC
