In a diesel engine lube oil system, which of the following parts should be lubricated first?（）<br>A:Camshaft beatings<br>B:Main bearings<br>C:Piston crowns<br>D:Cylinder walls

In a diesel engine lube oil system, which of the following parts should be lubricated first?（）
A:Camshaft beatings
B:Main bearings
C:Piston crowns
D:Cylinder walls

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