单选题Crankcase explosions in propulsion diesel result from（）Athe splashing of lubrication oil by the crankshaftBthe dilution of crankcase oil with particles of combustionCbroken fuel lines spraying oil on the crankcaseDthe ignition of unburned fuel and air in the crankcase
单选题
Crankcase explosions in propulsion diesel result from（）
A
the splashing of lubrication oil by the crankshaft
B
the dilution of crankcase oil with particles of combustion
C
broken fuel lines spraying oil on the crankcase
D
the ignition of unburned fuel and air in the crankcase
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