When the two elements of a pair have __________ when in motion, it is said to a lower pair.

When the two elements of a pair have __________ when in motion, it is

1.	When the two elements of a pair have __________ when in motion, it is said to a lower pair.
A.	line or point contact
B.	surface contact
C.	Can't say
D.	None of these
Answer» C. Can't say

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When the two elements of a pair have __________ when in motion, it is said to a lower pair.

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