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

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单项选择题

A.before TDC and close after BDC
B.after TDC and close after BDC
C.before TDC and close before BDC
D.after TDC and close before BDC

单项选择题

A.an air start cam
B.cylinder compression pressure
C.starting air pressure
D.valve springs

单项选择题

A.chemical analysis
B.back pressure readings
C.pyrometer readings
D.infrared analysis