單項(xiàng)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


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1.單項(xiàng)選擇題Cylinder liner cooling is often referred to as （）.

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

2.單項(xiàng)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

3.單項(xiàng)選擇題Crankshafts of medium speed engines are （） from a single piece of steel.

A.unusually solid welded
B.never be solid forged
C.almost invariably solid forged
D.almost invariably be welded

4.單項(xiàng)選擇題Cracks in the cylinders and cylinder covers may （） unequal heating.

A.result from
B.result in
C.give out
D.given from

5.單項(xiàng)選擇題Cracks in cylinder and cylinder covers may （） from unequal heating.

A.make
B.cause
C.result
D.produce