单选题Regarding a Diesel engine crankcase, the general arrangement and installation should preclude the possibility of （）Afree entry of air to the crankcaseBwater entering the crankcase while engine wash-downs are being performedCexcessive oil leakage during periods of increased blow-byDsub-cooling internal components
单选题
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
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