to reduce friction between rotating shafts of machine tools, we use ( )
a)ground surfaces b)lubricants
c)ball bearings d)spraying powder
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to reduce friction between rotating shafts of machine tools, we use ( )
a)ground surfaces b)lubricants
c)ball bearings d)spraying powder
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Answer: b)lubricants
Explanation:
Answer:
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Explanation:
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