单项选择题
The ignition quality of a diesel fuel is indicated by the （）
A.cetane number B.volatility point C.viscosity index D.octane number
单项选择题 The ignition quality of a diesel fuel oil is indicated by the （）
单项选择题 Which of the following conditions could contribute to the cracking of a diesel engine cylinder head?（）
单项选择题 The cetane rating of diesel fuel is an indication of the（）
