单项选择题

A large, low-speed, main propulsion diesel engine uses sea water to directly cool the （）.

A.cylinder heads
B.exhaust valves
C.scavenging air
D.injectors

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Lube oil pumps taking suction from the sump of most small marine engines are usually （）.

A.of the diaphragm type
B.of the centrifugal type
C.of the positive displacement type
D.independently driven by electric motors

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Fuel oil begins injection into the cylinder of a four-stroke/cycle diesel engine during the （）.

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Telescopic pipes to the piston of a large slow-speed main propulsion diesel engine are designed to prevent （）.

A.excessive crankcase pressure
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C.contamination of the lube oil by water
D.contamination of the cooling water by lube oil