单项选择题
A.excessive lube oil pressure B.the proper seating of new rings C.a worn cylinder liner D.a malfunctioning cylinder relief valve
Scuffed cylinder liner wearing surfaces in a diesel eng...
单项选择题Scuffed cylinder liner wearing surfaces in a diesel engines can result from （）
A.starting the engine while hot B.knurling the piston skirt C.operating the engine overheated D.scuff resistant piston rings
Exhaust pipes for separate diesel engines can be combin...
单项选择题Exhaust pipes for separate diesel engines can be combined only when （）
A.space limitations prevent separately run pipes B.the engines are small auxiliary units C.they are arranged to prevent gas backflow to each engine D.a waste heat boiler is installed
An increase in crankcase pressure generally indicates（）...
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
