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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单项选择题
Cylinders of marine diesel engines are normally cooled by （）.

A.sea water
B.fine mineral oil
C.sanitary water
D.fresh water
单项选择题
Cylinder liner cooling is often referred to as （）.

A.piston cooling
B.sleeve cooling
C.central cooling
D.jacket cooling
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