单项选择题
A.the splashing of lubrication oil by the crankshaft
B.the dilution of crankcase oil with particles of combustion
C.broken fuel lines spraying oil on the crankcase
D.the ignition of unburned fuel and air in the crankcase
单项选择题 Diesel engine automated control systems may utilize sensing devices of dual function, with sensing ranges providing both alarm and engine shut down capability.Which of the key points would only require an alarm sensor?（）
单项选择题 What is the function of an engine’s stationary parts?（）
单项选择题 An overcorrecting and unstable engine governor operation is known as（）.