單項選擇題What causes diesel fuel to be ignited in the cylinder of an operating diesel engine?()

A.Spark plug
B.Heat of compression
C.Carburetor
D.Glow plug


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1.單項選擇題If a diesel engine fails to start,one of the likely causes is ()

A.low compression temperature
B.low ambient air pressure
C.high lube oil pump pressure
D.high fuel oil booster pump pressure

2.單項選擇題Icreasing the exhaust valve tappet clearance of a diesel engine will result in the exhaust valve opening ()

A.later and closing earlier
B.later and closing later
C.earlier and closing earlier
D.earlier and closing later