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
单项选择题 Diesel engine air start valve timing is controlled by（）
单项选择题 The timing of diesel engine air starting valves is controlled by（）
单项选择题 The minimum fuel oil delivery pressure required for diesel engine injection depends primarily on the（）
