单选题Telescopic pipes to the piston of a large slow-speed main propulsion diesel engine are designed to prevent （）.Aexcessive crankcase pressureBexcessive lube oil temperatureCcontamination of the lube oil by waterDcontamination of the cooling water by lube oil
单选题
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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