18
Question
To reduce friction, the movable parts of machines must be periodically ________.
To reduce friction, the movable parts of machines must be periodically ________.
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Solution
The correct option is A lubricated
Friction causes wear and tear of the moving parts of a machine. It cannot be completely eliminated, however, can be reduced by using lubricants such as oil, and grease, etc.
Friction causes wear and tear of the moving parts of a machine. It cannot be completely eliminated, however, can be reduced by using lubricants such as oil, and grease, etc.
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