A.later and closing earlier
B.later and closing later
C.earlier and closing earlier
D.earlier and closing later
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A.quantity of fuel injected is decreased
B.quantity of fuel injected will always be increased
C.start of injection is advanced
D.duration of injection will always be greater
A.Over speed
B.fire improperly
C.lose oil pressure
D.overheatrapidly
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Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?（）
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（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
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