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单选题
The amount of fuel delivered by a unit injector is controlled by the （）
A
camshaft
B
main spring
C
rack position
D
nozzle orifice size
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单选题The amount of fuel injection into a diesel engine cylinder by a unit injector, is controlled by（）A
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assist in a quick cutoff of fuel injectionB
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单选题If you suspect a diesel engine is misfiring due to air leakage into the fuel system, you should begin looking for the leak at the （）A
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