單項選擇題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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2.單項選擇題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

3.單項選擇題Cylinders of marine diesel engines are normally cooled by （）.

A.sea water
B.fine mineral oil
C.sanitary water
D.fresh water

4.單項選擇題Cylinder liner cooling is often referred to as （）.

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

5.單項選擇題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