Hardening of steel is not possible, unless it is heated _________________ critical point ?

Hardening of steel is not possible, unless it is heated ______________

1.	Hardening of steel is not possible, unless it is heated _________________ critical point ?
A.	Above the highest
B.	Above the lowest
C.	Between the first & second
D.	Between the second & third
Answer» C. Between the first & second

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Hardening of steel is not possible, unless it is heated _________________ critical point ?

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