单项选择题
White smoke exhausting from an operating diesel engine may indicate （）
A.a cracked liner B.burning lube oil C.an overloaded engine D.insufficient combustion air
单项选择题 The over-speed trip installed on most diesel engine will stop the engine by shutting off the （）
单项选择题 The blower type crankcase ventilation system （）
单项选择题 One remedy for a high firing pressure, in addition to a high exhaust temperature in one cylinder of a diesel engine, is to （）
