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?（）
A.Speed limiting governor B.Over-speed governor C.Over-speed trip D.Over-speed relay
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（）
单项选择题 The purpose of compressing the air within the cylinder of a diesel engine is to （）
