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

A. Cold

B. Work

C. Age

D. Induction

Please do not use chat terms. Example: avoid using "grt" instead of "great".

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  18. A dummy activity is used in PERT network to describe the
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  27. Dislocations are __________ defects.
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