單項(xiàng)選擇題

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

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單項(xiàng)選擇題

The over-speed trip installed on most diesel engine will stop the engine by shutting off the （）

A.water supply
B.fuel oil supply
C.lube oil supply
D.exhaust damper

單項(xiàng)選擇題

The blower type crankcase ventilation system （）

A.removes combustible gases in the crankcase
B.prevents the formation of combustible gases in the crankcase
C.cools lubricating oil
D.improves cold weather starting