单项选择题
Which of the conditions listed may occur in an operating diesel engine if air pockets form within the cylinder head circulating water passages? （）
A.Hydraulic stress and distortion will develop B.Hot spots will develop C.Fuel oil viscosity will increased D.An increase in trapped deposits of scale and dirt
单项选择题 The two strokes of a two-stroke/cycle diesel engine are （）
单项选择题 Which of the items listed causes a direct acting mechanical governor to operate the engine fuel control linkage?（）
单项选择题 Combustion knock occurring in a diesel engine can be caused by （）
