单项选择题
A.reduce heat radiation to the engine room
B.aid in preventing turbocharger overheating
C.condense and drain moisture from exhaust gases
D.dampen exhaust gas pulsations in the manifold
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 （）
单项选择题 A substantial increase in crankcase pressure could be an indication of （）