Regarding a Diesel engine crankcase, the general arrangement and installation should precl

Regarding a Diesel engine crankcase, the general arrangement and installation should preclude the possibility of _____.

A.free entry of air to the crankcase

B.water entering the crankcase while engine wash-downs are being performed

C.excessive oil leakage during periods of increased blow-by

D.sub-cooling internal components

请帮忙给出正确答案和分析，谢谢！

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