The two elements of a pair are said to form a higher pair, when they – McqOptions

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1.	The two elements of a pair are said to form a higher pair, when they
A.	have a surface contact when in motion
B.	have a line or point contact when in motion
C.	are kept in contact by the action of external forces, when in motion
D.	permit relative motion
Answer» C. are kept in contact by the action of external forces, when in motion

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