Lubricating systems for diesel engines are usually designed to initially provide lube oil to the engine （）<br>A:camshaft beatings<br>B:main bearings<br>C:piston crowns<br>D:cylinder walls

Lubricating systems for diesel engines are usually designed to initially provide lube oil to the engine （）
A:camshaft beatings
B:main bearings
C:piston crowns
D:cylinder walls

出自：海船船员证

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