单选题 1分

Before pumping up the crankcase oil, ______ should be worked by hand to minimize corrosive action on...

Before pumping up the crankcase oil, ______ should be worked by hand to minimize corrosive action on the liners.
  • A.the cylinder lubricators
  • B.the turning gear
  • C.the starting valves
  • D.the indicators

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