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Fuel has been injected but ignition failsThe possible cause may be _____.

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the exhaust will be clear  fuel consumption will be low  all the fuel will be burned at top dead center  fuel consumption will be high  
ignition may be delayed  fuel economy is not affected  exhaust gas temperature will be unchanged  the exhaust will be clear  
a shortened ignition delay period  a lean fuel/air mixture  excess fuel in the combustion chamber  rapid vaporization of injected fuel droplets  
heat conduction into the injected fuel oil  heat conduction into the water jacket wall  water circulation through passages in the holder  fuel oil circulation through passages in the holder  
quantity of fuel injected is decreased  quantity of fuel injected will always be increased  start of injection is advanced  duration of injection will always be greater  
increase engine power  increase engine load  decrease engine power  improve fuel economy  
Air must be admitted/without  Oil must be injected/without  Air must be admitted/with  Oil must be injected/with  
is purified  in timed  is compressed  atomizes  
Quantity of fuel injected tends to be decreased  Quantity of fuel injected will always be increased  Start of injection tends to be advanced  Duration of injection will always greater  
is being passed    are being passed    have been passed    has passed  
controlling the amount of fuel injected into the cylinders  varying the speed of the turbocharger  adjusting the compression ratio  changing the timing of the fuel injection camshaft  
prolong the ignition delay period  ensure the beginning of fuel injection  thoroughly utilize the air charge  allow controlled fuel combustion  
degree of cylinder air turbulence  firing pressure in the engine  quality of fuel to be injected  duration of the ignition delay period  
stored in a common fuel line  pumped by the injection pump  at low pressure  already atomized  
the piston is just coming upward from the bottom dead center  the piston has moved about one-fifth of the way up  the piston has moved most of the way up and almost reached the TDC  the piston has just past the TDC  
the heat compressed fuel/air mixture in the cylinder  the fuel igniter  the fuel injector  the fuel pump  
valve will open later  valves will close later  amount of fuel injected will be increased  amount of fuel injected will be decreased  
the starting air supply is cut off and fuel is injected into the cylinders  the fuel feeding is cut off and the turning gear is put in  the starting air supply is cut off and turning gear is taken out  the electric blower is shut down and fuel is injected into the cylinders  
The amount of fuel injected will be increased  The start of injection will be retarded  The nozzle will permit fuel to dribble  The spray pattern will be distorted  

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