单项选择题
In describing basic diesel engine operation，the term ‘event’ refers to （）
A.the production of high pressure gases B.the removal of expended combustion gases C.the admission of air to the cylinder D.all of the above
单项选择题 To shut down a diesel engine after it exceeds the set maximum speed，which type of device listed should be used?（）
单项选择题 Diesel engine lube oil diluted with fuel oil is indicated by（）
单项选择题 The primary purpose of oil control rings on a diesel piston is to（）
