单项选择题
A possible cause for an individual piston to knock when at TDC on a slow-speed, two-stroke/cycle main propulsion diesel engine could be due to （）
A.early fuel injection B.excessive bearing play within the running gear C.overloading of the cylinder D.all of the above
单项选择题 In a diesel engine, the time taken to heat the fuel particles, turn them into vapor, and bring about combustion is called （）
单项选择题 Fuel is ignited in a diesel engine cylinder by （）
单项选择题 Vessels having main engines arranged for air starting are to be provided with at least （）
