单项选择题
Low compression in a diesel engine could be caused by（）
A.worn or broken cylinder liner sealing rings B.high cooling water temperature C.worn or broken piston rings D.low fuel oil pressure
单项选择题 The most common instrument used to measure diesel engine exhaust pressure is the （）
单项选择题 A sudden drop in compression pressure in one cylinder of a diesel engine can be caused by（）
单项选择题 One end of a diesel engine cylinder is sealed by the cylinder head and the other end by the （）
