单选题Lubricating oil is supplied to the crank-pin bearings in a marine diesel engine by （）.Ainternal crankshaft passagesBimmersion in oilCsplash lubricationDinjection lubrication
单选题
Lubricating oil is supplied to the crank-pin bearings in a marine diesel engine by （）.
A
internal crankshaft passages
B
immersion in oil
C
splash lubrication
D
injection lubrication
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