Cylinders of marine diesel engines are normally cooled by （）.

Cylinder liner cooling is often referred to as （）.

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

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Cross scavenging requires the fitting of （） to prevent air or exhaust gas escape when the piston is at the top of the stroke.

A.a exhaust valve
B.a piston skirt
C.a piston crown
D.an air suction valve

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