单项选择题
A.the elimination of valve wear
B.improved atomization
C.a decrease in cylinder blow-by
D.an increase in cylinder blow-by
单项选择题 Air motion is induced in a four-stroke/cycle diesel engine cylinder to improve air fuel mixing, and is known as（）
单项选择题 Which of the following statements is correct concerning diesel engine cooling water systems?（）
单项选择题 In a full flow type lube oil system, the bypass relief valve will lift due to （）