单项选择题

In the cylinder of a diesel engine fuel is ignited by the（）

A.spark from a plug in the pre-combustion chamber
B.electrical discharge from the distributor
C.heat of compression within the cylinder
D.heat from the fuel injection nozzle

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单项选择题

Diesel engine air start valve timing is controlled by（）

A.engine operating speed
B.an air manifold
C.a hydraulic distributor
D.individual cams and valve gear

单项选择题

The timing of diesel engine air starting valves is controlled by（）

A.the air start valve timing gears and rods
B.a cylinder check valve
C.individual cams and valve gear
D.an air manifold poppet valve

单项选择题

The minimum fuel oil delivery pressure required for diesel engine injection depends primarily on the（）

A.degree of cylinder air turbulence
B.firing pressure in the engine
C.quality of fuel to be injected
D.duration of the ignition delay period