Give reason....
1--machines parts are frequently oiled or greased.
2--sports cars,aeroplanes and boats are designed to have a streamlined shape.
3. metal chain are wrapped on tyre when they run on ice road.
4. roller are used for transporting luggage.
anybody can help me
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1: This is because like we need food so like that the food of the machine is oil and if there is no oil the Machine would be rough to work with the machine and chances to get broke
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