单项选择题
A.crankcase B.cylinder head C.valve cover D.engine frame
Which of the diesel engine components listed increase a...
单项选择题Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?（）
A.Impeller B.Compressor C.After-cooler D.Exhaust differ
Lube oil in the fresh water cooling system of a diesel ...
单项选择题Lube oil in the fresh water cooling system of a diesel engine may result from a （）
A.camshaft seizure B.lube oil pump failure C.lube oil cooler failure D.lube oil pump overflow
Which of the following problems is the main source of f...
单项选择题Which of the following problems is the main source of fuel pump and injection system malfunctions?（）
A.Improper lubrication B.Air in the fuel system C.Coated fuel lines D.Excessive vibration
