Cold working of a material results in increase in hardness, which is termed as the __________ hardening.

Cold working of a material results in increase in hardness, which is t

1.	Cold working of a material results in increase in hardness, which is termed as the __________ hardening.
A.	cold
B.	work
C.	age
D.	induction
Answer» C. age

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Cold working of a material results in increase in hardness, which is termed as the __________ hardening.

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