单项选择题
An increase in crankcase pressure generally indicates（）
A.worn connecting rod bearings B.worn engine cylinder liners C.high cylinder firing pressure D.stuck spring-loaded manhole covers
单项选择题 Scuffed cylinder liner wearing surfaces in a diesel engines can result from （）
单项选择题 If the relief valve on a diesel engine cylinder lifts, the cause could be due to （）
单项选择题 Which of the following operation will have a direct impact on the rate of wear in a cylinder liner （）
