单选题The common method of applying oil to the cylinder walls is by means of small pump assembled in units, known as （）.Amechanical lubricatorBlubrication functionCforced feed systemDbearing lubrication
单选题
The common method of applying oil to the cylinder walls is by means of small pump assembled in units, known as （）.
A
mechanical lubricator
B
lubrication function
C
forced feed system
D
bearing lubrication
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