Question

(e) Ball-bearings
are used in machines.
(i)
Metal chains are wrapped on tyres when they run on icy roads.
(j) Rollers are used for transporting luggage.
the cause of r
(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 s​

Answer 1

Answer:

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Answer 2

Explanation:

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