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| Q. |
Formation of thick layer of scale on the surface of steel articles can be minimised by |
| A. | heating in furnaces with reducing neutral or protective atmosphere |
| B. | heating in boxes with used carburising agent or cast iron chips |
| C. | heating in molten salt bath |
| D. | Any of the above |
| E. | Low specific heat of quenching oil |
| Answer» D. Any of the above | |
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