题目
5.[单选题]船舶柴油机的工作系统、操纵系统和控制系统In a diesel engine lube oil system, which of the following parts should be lubricated first?A. Camshaft bearingsB. Main bearingsC. Piston crownsD. Cylinder walls
5.[单选题]船舶柴油机的工作系统、操纵系统和控制系统
In a diesel engine lube oil system, which of the following parts should be lubricated first?
A. Camshaft bearings
B. Main bearings
C. Piston crowns
D. Cylinder walls
题目解答
答案
B. Main bearings