单项选择题
A.proper fuel metering
B.complete fuel/air mixing
C.minimal fuel penetration
D.proper fuel timing
单项选择题 For a given fuel, a change in the compression ratio will affect the ignition lag by which of the listed means?（）
单项选择题 What is the term given to the process of breaking up fuel oil into very fine particles for better combustion?（）
单项选择题 In a diesel engine, an extremely leaking exhaust valve can cause （）.