单项选择题

If a used lube oil analysis indicates excessive fuel dilution, the lube oil should be （）

A.changed
B.centrifuged
C.filtered
D.settled

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单项选择题

How are the pressure and temperature affected in a diesel engine cylinder during compression?（）

A.Pressure and temperature decrease
B.Pressure and temperature increase
C.Pressure decreases and temperature increases
D.Pressure increases and temperature decreases

单项选择题

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

单项选择题

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