单项选择题
In diesel engineering practice, the term used to express the ignition quality of a particular fuel is（）
A.cetane number B.octane number C.ignition index number D.volatility point
单项选择题 The cetane number rates fuels for diesel engines according to its （）
单项选择题 Diesel engine starting difficulties due to cold intake air temperatures, can be overcome by using a/an（）
单项选择题 The burning of fuel oil in a diesel engine having a high sodium content, will cause （）
