单选题A grease gun is generally used to lubricate a （）.Acondensate pump ball bearingBmain shaft bearingCmain turbine bearingDdiesel engine wrist pin bearing
单选题
A grease gun is generally used to lubricate a （）.
A
condensate pump ball bearing
B
main shaft bearing
C
main turbine bearing
D
diesel engine wrist pin bearing
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