1 What is screw ? Give 3 uses of screws
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Screws are widely used in threaded fasteners to hold objects together, and in devices such as screw tops for containers, vises, screw jacks and screw presses. Other mechanisms that use the same principle, also called screws, don't necessarily have a shaft or threads.
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A screw is a machine and appears like an inclined plane wound around a rod with a pointed tip. For example a jar lid, a drill
the three uses of screw
It is used in fitting the object in wall.
it is used in making or fixing machine and electrical appliance.
it is used in companies and industries
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