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（）
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（）
