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單項選擇題

A diesel engine is warmed up and white vapor is in the exhaust，this could indicate （）

A.excessive cylinder lubrication
B.a lugging engine
C.a leaking cylinder liner
D.overloading of one cylinder

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單項選擇題

The main operating characteristic of diesel engines which distinguishes them from other internal combustion engines is the （）

A.method of supplying air
B.cooling system
C.method of igniting fuel
D.valve operating mechanism

單項選擇題

Turbulence is created in the cylinders of a diesel engine to （）

A.obtain injection lag
B.help mix fuel and air
C.increase combustion pressure
D.utilize higher injection pressures

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