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Tensile strength of steel can be safely in-creased by | |
A. | adding carbon upto 2.8% [Wrong Answer] |
B. | adding carbon upto 6.3% [Wrong Answer] |
C. | adding carbon upto 0.83% [Correct Answer] |
D. | adding small quantities of copper [Wrong Answer] |
E. | adding copper and carbon. [Wrong Answer] |