单选题On a medium-speed main propulsion diesel engine, the crank-pin or crank journal bearings receive lubricating oil from （）.Aa spindle lubricatorBan oil jetCinternal splashingDdrilled passages in the crankshaft
单选题
On a medium-speed main propulsion diesel engine, the crank-pin or crank journal bearings receive lubricating oil from （）.
A
a spindle lubricator
B
an oil jet
C
internal splashing
D
drilled passages in the crankshaft
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