A grease gun is generally used to lubricate a （）.<br>A:condensate pump ball bearing<br>B:main shaft bearing<br>C:main turbine bearing<br>D:diesel engine wrist pin bearing

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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