单项选择题
A.worn cylinder liner
B.faulty cylinder relief valve
C.excessive lube oil pressure
D.excessive scavenge air pressure
单项选择题 A water jacket is placed around the exhaust manifolds of propulsion diesel engines to（）
单项选择题 An increase in diesel engine crankcase pressure generally indicates excessive（）
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 （）