单选题In a diesel engine lube oil system, which of the following parts should be lubricated first?（）ACamshaft beatingsBMain bearingsCPiston crownsDCylinder walls
单选题
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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