单项选择题
A.compression pressure
B.lube oil header pressure
C.scavenge air pressure
D.piston ring blow-by
单项选择题 You are inspecting the lower main precision bearings on a diesel engine.You observe that about half the thin Babbitt linings are of a milky white colourThis condition is caused by （）
单项选择题 A substantial increase in crankcase pressure could be an indication of （）
单项选择题 Scuffed cylinder liner wearing surfaces in a diesel engines can result from （）