单项选择题

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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The rate of cylinder lubricating oil metered to each cylinder of a large low-speed main propulsion diesel engine is （）

A.the same, whether at sea, or during maneuvering
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