单项选择题
A.a higher cetane number of fuel oil
B.the diesel fuel used having a high viscosity
C.mechanical rigidity in the lube pump mechanism
D.a decrease rigidity in the fuel pump delivery pressure
单项选择题 Which of the following relationships should occur between the temperature developed in a combustion space, and the compression ratio of the engine?（）
单项选择题 An acceptable method of measuring for the correct rotational force applied to the connecting rod and main bearing bolts, is to use a（）
单项选择题 Which of the listed types of starting systems is often used on large, low-speed, direct reversing, main propulsion diesel engines?（）