单项选择题

Dirty oil must be （） before being used again.

A.mixed with clean oil
B.purified
C.heated
D.strained

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单项选择题
Dirt in the fuel oil system of a diesel engine can cause （）.

A.clogged filters
B.poor combustion
C.overloading of the diesel
D.shock of fuel lines
单项选择题
Diesel oil may be used to cool （） of a diesel engine.

A.cylinders
B.exhaust valves
C.pistons
D.fuel valves
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