(e) Ball-bearings are used in machines.
(f) Tyres of the vehicles need to be changed regularly.
(g) Machines parts are frequently oiled or greased.
(h) Sport cars, aeroplanes and boats are designed to have a streamlined shape.
(i) Metal chains are wrapped on tyres when they run on icy roads.
(1) Rollers are used for transporting luggage.
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A) yes ball bearings are used in spinners and vehicles
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