单选题Before pumping up the crankcase oil,（） should be worked by hand to minimize corrosive action on the liners.Athe indicatorsBthe starting valvesCthe cylinder lubricatorsDthe turning gear
单选题
Before pumping up the crankcase oil,（） should be worked by hand to minimize corrosive action on the liners.
A
the indicators
B
the starting valves
C
the cylinder lubricators
D
the turning gear
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