问题描述：
[单选]
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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答案解析：无
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上一篇：Fuel oil begins injection into the cylinder of a four-stroke/cycle diesel engine during the（）．
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