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

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

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