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Why is this so ? Machines have to be mai...

Why is this so ?
Machines have to be maintained.

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Parts of the machine undergo wear and tear. Due to constant rubbing some parts may even get damaged. The weather, the rust and the dust may spoil the parts of the machines. If the machine is not functioning well, we may not use this facility when we need it the most. Therefore, machines need to be maintained regularly.
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NAVNEET PUBLICATION-SIMPLE MACHINES-QUESTION BANK
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