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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单项选择题

Diesel engines are started by supplying （） into the cylinders in the appropriate sequence for the required direction.

A.fuel oil
B.diesel oil
C.compressed air
D.jacket water

单项选择题

Diesel engines are started by supplying （） into the cylinders in the appropriate sequence for the required direction.

A.cooling water
B.compressing air
C.compressed air
D.cylinder oil

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