单项选择题
Low compression in a diesel engine can be caused by （）
A.clogged coolant passages B.a leaking cylinder head gasket C.low fuel oil pressure D.worn or broken cylinder liner sealing rings
单项选择题 In a four-stroke cycle diesel engine the intake valves open （）
单项选择题 Diesel engine air start system check valves are opened by （）
单项选择题 For a diesel engine, individual cylinder performance is commonly determined by exhaust gas（）
