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| Q.55 | During cyaniding : | |
| Ans | 1. carbon and nitrogen are introduced into the surface of steel | |
| 2. carbon and sulphur are introduced into the surface of steel | ||
| 3. sulphur and nitrogen are introduced into the surface of steel | ||
| 4. carbon and oxygen are introduced into the surface of steel |
Correct Ans Provided: 1
