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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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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Telescopic pipes to the piston of a large slow-speed main propulsion diesel engine are designed to prevent （）.
A.excessive crankcase pressure
B.excessive lube oil temperature
C.contamination of the lube oil by water
D.contamination of the cooling water by lube oil
