The toughness of a material _________ when it is heated

A. Does not change

B. Increases

C. Decreases

D. None of the Above

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

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  19. A bolt of uniform strength can be developed by
  20. Which is positive drive?
  21. Which is correct statement?
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  23. Cold working
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