单选题On small, low pressure, air compressors, the cylinders are usually lubricated by the （）.Asplash methodBmechanical force feed lubricatorsCdetached sump methodDinternal cooling passages in the crankshafts and connecting rods
单选题
On small, low pressure, air compressors, the cylinders are usually lubricated by the （）.
A
splash method
B
mechanical force feed lubricators
C
detached sump method
D
internal cooling passages in the crankshafts and connecting rods
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