单项选择题

Late fuel injection in a diesel engine is indicated by low firing pressure with （）

A.low exhaust temperature
B.low exhaust pressure
C.mechanical knock in each cylinder
D.black or gray exhaust smoke

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单项选择题

A.swept volume of the cylinder
B.inside diameter of the cylinder
C.piston displacement in the cylinder
D.length of the piston stroke

单项选择题

A.Advanced ignition
B.Clogged air intake
C.Leaky exhaust valve
D.High exhaust pressure

单项选择题

A.a cylinder air charge of higher pressure
B.increased pumping losses
C.less valve overlap
D.reduced blow-by