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（）
单项选择题 One method of determining crankshaft misalignment is by（）
单项选择题 Heat for igniting the fuel oil in the cylinder of a diesel engine is generated by the （）
