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less fuel will enter the cylinder lower will be cylinder compression temperatures more complete will be fuel combustion more rapid will be the rise in combustion pressure
low ignition quality a high volatility low ignition delay a high cetane number
delay shrink relieve depress
keep piston crown temperatures elevated for smoother combustion reduce the possibility of overheating the top compression ring help retain the heat of compression to prevent ignition delay help retain the heat of compression to prevent combustion knock
postpone cancel delay refuse
postpone refuse delay cancel
harder it is to extinguish easier it is to extinguish less chance there is of re-ignition easier it is to control
（1） only is correct （2） only is correct both （1） and （2） are correct neither （1） or （2） are correct
cetane number of 55 cetane number of 45 octane number of 55 octane number of 45
injection lag ignition delay compression turbulence lag
increase ignition delay affect fuel oil metering affect engine performance at low speed only disappear due to fuel oil abrasion
prolong the ignition delay period ensure the beginning of fuel injection thoroughly utilize the air charge allow controlled fuel combustion
shrink delay disperse sink
degree of cylinder air turbulence firing pressure in the engine quality of fuel to be injected duration of the ignition delay period
produce the heat for ignition decrease injection lag increase ignition delay aid in exhausting burnt gases
a shortened ignition delay period a lean fuel/air mixture excess fuel in the combustion chamber rapid vaporization of injected fuel droplets
Combustion does not begin until the piston starts down on the power stroke Maximum combustion pressure is reached before TDC Turbulence in the cylinder causes a delay in ignition Maximum cylinder firing pressure is not developed until the piston passes TDC
delay refuse cancel postpone
shrink delay disperse sink
postpone refuse delay cancel
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